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Posted to commits@sling.apache.org by cz...@apache.org on 2010/01/25 13:43:23 UTC
svn commit: r902794 [1/2] - in /sling/trunk/bundles/jcr/classloader: ./
src/main/java/org/apache/sling/jcr/classloader/internal/
src/main/java/org/apache/sling/jcr/classloader/internal/net/
Author: cziegeler
Date: Mon Jan 25 12:43:22 2010
New Revision: 902794
URL: http://svn.apache.org/viewvc?rev=902794&view=rev
Log:
SLING-1316 - Include jackrabbit classloader code to adjust it for Sling needs - code import with first changes.
Added:
sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/ClassLoaderResource.java (with props)
sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/ClassPathEntry.java (with props)
sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/DynamicRepositoryClassLoader.java (with props)
sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/URLRepositoryClassLoader.java (with props)
sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/Util.java (with props)
sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/net/
sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/net/FileParts.java (with props)
sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/net/JCRJarURLConnection.java (with props)
sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/net/JCRJarURLHandler.java (with props)
sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/net/JCRURLConnection.java (with props)
sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/net/JCRURLHandler.java (with props)
sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/net/URLFactory.java (with props)
Modified:
sling/trunk/bundles/jcr/classloader/pom.xml
sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/RepositoryClassLoaderFacade.java
Modified: sling/trunk/bundles/jcr/classloader/pom.xml
URL: http://svn.apache.org/viewvc/sling/trunk/bundles/jcr/classloader/pom.xml?rev=902794&r1=902793&r2=902794&view=diff
==============================================================================
--- sling/trunk/bundles/jcr/classloader/pom.xml (original)
+++ sling/trunk/bundles/jcr/classloader/pom.xml Mon Jan 25 12:43:22 2010
@@ -59,11 +59,6 @@
</Bundle-Category>
<Private-Package>
org.apache.sling.jcr.classloader.internal.*,
- org.apache.jackrabbit;
- org.apache.jackrabbit.classloader;
- org.apache.jackrabbit.name;
- org.apache.jackrabbit.net;
- org.apache.jackrabbit.util;split-package:=merge-first
</Private-Package>
</instructions>
</configuration>
@@ -115,12 +110,6 @@
<artifactId>junit</artifactId>
</dependency>
<dependency>
- <groupId>commons-collections</groupId>
- <artifactId>commons-collections</artifactId>
- <version>3.2.1</version>
- <scope>provided</scope>
- </dependency>
- <dependency>
<groupId>org.osgi</groupId>
<artifactId>org.osgi.core</artifactId>
</dependency>
Added: sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/ClassLoaderResource.java
URL: http://svn.apache.org/viewvc/sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/ClassLoaderResource.java?rev=902794&view=auto
==============================================================================
--- sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/ClassLoaderResource.java (added)
+++ sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/ClassLoaderResource.java Mon Jan 25 12:43:22 2010
@@ -0,0 +1,414 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.sling.jcr.classloader.internal;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.security.cert.Certificate;
+import java.util.Date;
+import java.util.jar.Manifest;
+
+import javax.jcr.Property;
+import javax.jcr.RepositoryException;
+
+import org.apache.sling.jcr.classloader.internal.net.URLFactory;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+
+/**
+ * The <code>ClassLoaderResource</code> class represents a resource looked up
+ * by the {@link ClassPathEntry}s of the {@link URLRepositoryClassLoader}.
+ */
+class ClassLoaderResource {
+
+ /** default log category */
+ private static final Logger log =
+ LoggerFactory.getLogger(ClassLoaderResource.class);
+
+ /**
+ * The class path entry which loaded this class loader resource
+ */
+ private final ClassPathEntry pathEntry;
+
+ /**
+ * The name of this resource.
+ */
+ private final String name;
+
+ /**
+ * The repository property providing the resource's contents. This may be
+ * <code>null</code> if the resource was loaded from a JAR/ZIP archive.
+ */
+ private final Property resProperty;
+
+ /**
+ * The class optionally loaded/defined through this resource.
+ *
+ * @see #getLoadedClass()
+ * @see #setLoadedClass(Class)
+ */
+ private Class<?> loadedClass;
+
+ /**
+ * The time in milliseconds at which this resource has been loaded from
+ * the repository.
+ */
+ private final long loadTime;
+
+ /**
+ * Flag indicating that this resource has already been checked for expiry
+ * and whether it is actually expired.
+ *
+ * @see #isExpired()
+ */
+ private boolean expired;
+
+ /**
+ * Creates an instance of this class for the class path entry.
+ *
+ * @param pathEntry The {@link ClassPathEntry} of the code source of this
+ * class loader resource.
+ * @param name The path name of this resource.
+ * @param resProperty The <code>Property</code>providing the content's of
+ * this resource. This may be <code>null</code> if the resource
+ * was loaded from an JAR or ZIP archive.
+ */
+ /* package */ ClassLoaderResource(ClassPathEntry pathEntry, String name,
+ Property resProperty) {
+ this.pathEntry = pathEntry;
+ this.name = name;
+ this.resProperty = resProperty;
+ this.loadTime = System.currentTimeMillis();
+ }
+
+ /**
+ * Returns the {@link ClassPathEntry} which loaded this resource.
+ */
+ protected ClassPathEntry getClassPathEntry() {
+ return pathEntry;
+ }
+
+ /**
+ * Returns the name of this resource. This is the name used to find the
+ * resource, for example the class name or the properties file path.
+ */
+ public String getName() {
+ return name;
+ }
+
+ /**
+ * Returns the <code>Property</code> with which this resource is created.
+ */
+ protected Property getProperty() {
+ return resProperty;
+ }
+
+ /**
+ * Returns the time in milliseconds at which this resource has been loaded
+ */
+ protected long getLoadTime() {
+ return loadTime;
+ }
+
+ /**
+ * Returns the URL to access this resource, for example a JCR or a JAR URL.
+ * If the URL cannot be created from the resource data, <code>null</code> is
+ * returned.
+ */
+ public URL getURL() {
+ try {
+ return URLFactory.createURL(getClassPathEntry().session, getPath());
+ } catch (Exception e) {
+ log.warn("getURL: Cannot getURL for " + getPath(), e);
+ }
+ return null;
+ }
+
+ /**
+ * Returns the URL to the code source of this entry. If there is no code
+ * source available, <code>null</code> is returned.
+ * <p>
+ * This base class implementation returns the result of calling
+ * {@link ClassPathEntry#toURL()} on the class path entry from which this
+ * resource was loaded.
+ */
+ public URL getCodeSourceURL() {
+ return getClassPathEntry().toURL();
+ }
+
+ /**
+ * Returns an <code>InputStream</code> to read from the resource.
+ * <p>
+ * This base class implementation returns the result of calling the
+ * <code>getStream()</code> method on the resource's property or
+ * <code>null</code> if the property is not set.
+ */
+ public InputStream getInputStream() throws RepositoryException {
+ return (getProperty() != null) ? getProperty().getStream() : null;
+ }
+
+ /**
+ * Returns the size of the resource or -1 if the size cannot be found out.
+ * <p>
+ * This base class implementation returns the result of calling the
+ * <code>getLength()</code> method on the resource's property or -1 if
+ * the property is not set.
+ *
+ * @throws RepositoryException If an error occurrs trying to find the length
+ * of the property.
+ */
+ public int getContentLength() throws RepositoryException {
+ return (getProperty() != null) ? (int) getProperty().getLength() : -1;
+ }
+
+ /**
+ * Returns the path of the property containing the resource.
+ * <p>
+ * This base class implementation returns the absolute path of the
+ * resource's property. If the property is not set or if an error occurrs
+ * accesing the property's path, the concatentation of the class path
+ * entry's path and the resource's name is returned.
+ */
+ public String getPath() {
+ if (getProperty() != null) {
+ try {
+ return getProperty().getPath();
+ } catch (RepositoryException re) {
+ // fallback
+ log.warn("getPath: Cannot retrieve path of entry " + getName(),
+ re);
+ }
+ }
+
+ // fallback if no resource property or an error accessing the path of
+ // the property
+ return getSafePath();
+ }
+
+ /**
+ * Returns the path of the property containing the resource by appending
+ * the {@link #getName() name} to the path of the class path entry to which
+ * this resource belongs. This path need not necessairily be the same as
+ * the {@link #getProperty() path of the property} but will always succeed
+ * as there is no repository access involved.
+ */
+ protected String getSafePath() {
+ return getClassPathEntry().getPath() + getName();
+ }
+
+ /**
+ * Returns the time of the the last modification of the resource or -1 if
+ * the last modification time cannot be evaluated.
+ * <p>
+ * This base class implementation returns the result of calling the
+ * {@link Util#getLastModificationTime(Property)} method on the resource's
+ * property if not <code>null</code>. In case of an error or if the
+ * property is <code>null</code>, -1 is returned.
+ */
+ public long getLastModificationTime() {
+ if (getProperty() != null) {
+ try {
+ return Util.getLastModificationTime(getProperty());
+ } catch (RepositoryException re) {
+ log.info("getLastModificationTime of resource property", re);
+ }
+ }
+
+ // cannot find the resource modification time, use epoch
+ return -1;
+ }
+
+ /**
+ * Returns the resource as an array of bytes
+ */
+ public byte[] getBytes() throws IOException, RepositoryException {
+ InputStream in = null;
+ byte[] buf = null;
+
+ log.debug("getBytes");
+
+ try {
+ in = getInputStream();
+ log.debug("getInputStream() returned {}", in);
+
+ int length = getContentLength();
+ log.debug("getContentLength() returned {}", new Integer(length));
+
+ if (length >= 0) {
+
+ buf = new byte[length];
+ for (int read; length > 0; length -= read) {
+ read = in.read(buf, buf.length - length, length);
+ if (read == -1) {
+ throw new IOException("unexpected EOF");
+ }
+ }
+
+ } else {
+
+ buf = new byte[1024];
+ int count = 0;
+ int read;
+
+ // read enlarging buffer
+ while ((read = in.read(buf, count, buf.length - count)) != -1) {
+ count += read;
+ if (count >= buf.length) {
+ byte buf1[] = new byte[count * 2];
+ System.arraycopy(buf, 0, buf1, 0, count);
+ buf = buf1;
+ }
+ }
+
+ // resize buffer if too big
+ if (count != buf.length) {
+ byte buf1[] = new byte[count];
+ System.arraycopy(buf, 0, buf1, 0, count);
+ buf = buf1;
+ }
+
+ }
+
+ } finally {
+
+ if (in != null) {
+ try {
+ in.close();
+ } catch (IOException ignore) {
+ }
+ }
+
+ }
+
+ return buf;
+ }
+
+ /**
+ * Returns the manifest from the jar file for this class resource. If this
+ * resource is not from a jar file, the method returns <code>null</code>,
+ * which is what the default implementation does.
+ */
+ public Manifest getManifest() {
+ return null;
+ }
+
+ /**
+ * Returns the certificates from the jar file for this class resource. If
+ * this resource is not from a jar file, the method returns
+ * <code>null</code>, which is what the default implementation does.
+ */
+ public Certificate[] getCertificates() {
+ return null;
+ }
+
+ /**
+ * Returns the <code>Property</code> which is used to check whether this
+ * resource is expired or not.
+ * <p>
+ * This base class method returns the same property as returned by the
+ * {@link #getProperty()} method. This method may be overwritten by
+ * implementations as appropriate.
+ *
+ * @see #isExpired()
+ */
+ protected Property getExpiryProperty() {
+ return getProperty();
+ }
+
+ /**
+ * Returns <code>true</code> if the last modification date of the expiry
+ * property of this resource is loaded is later than the time at which this
+ * resource has been loaded. If the last modification time of the expiry
+ * property cannot be calculated or if an error occurrs checking the expiry
+ * propertiy's last modification time, <code>true</code> is returned.
+ */
+ public boolean isExpired() {
+ if (!expired) {
+ // creation time of version if loaded now
+ long currentPropTime = 0;
+ Property prop = getExpiryProperty();
+ if (prop != null) {
+ try {
+ currentPropTime = Util.getLastModificationTime(prop);
+ } catch (RepositoryException re) {
+ // cannot get last modif time from property, use current time
+ log.debug("expireResource: Cannot get current version for "
+ + toString() + ", will expire", re);
+ currentPropTime = System.currentTimeMillis();
+ }
+ }
+
+ // creation time of version currently loaded
+ long loadTime = getLoadTime();
+
+ // expire if a new version would be loaded
+ expired = currentPropTime > loadTime;
+ if (expired && log.isDebugEnabled()) {
+ log.debug(
+ "expireResource: Resource created {} superceded by version created {}",
+ new Date(loadTime), new Date(currentPropTime));
+ }
+ }
+
+ return expired;
+ }
+
+ /**
+ * Returns the class which was loaded through this resource. It is expected
+ * that the class loader sets the class which was loaded through this
+ * resource by calling the {@link #setLoadedClass(Class)} method. If this
+ * class was not used to load a class or if the class loader failed to
+ * set the class loaded through this resoource, this method will return
+ * <code>null</code>.
+ *
+ * @return The class loaded through this resource, which may be
+ * <code>null</code> if this resource was never used to load a class
+ * or if the loader failed to set class through the
+ * {@link #setLoadedClass(Class)} method.
+ *
+ * @see #setLoadedClass(Class)
+ */
+ public Class<?> getLoadedClass() {
+ return loadedClass;
+ }
+
+ /**
+ * Sets the class which was loaded through this resource. This method does
+ * not check, whether it is plausible that this class was actually loaded
+ * from this resource, nor does this method check whether the class object
+ * is <code>null</code> or not.
+ *
+ * @param loadedClass The class to be loaded.
+ */
+ public void setLoadedClass(Class<?> loadedClass) {
+ this.loadedClass = loadedClass;
+ }
+
+ /**
+ * Returns the <code>String</code> representation of this resource.
+ */
+ public String toString() {
+ final StringBuilder buf = new StringBuilder(getClass().getName());
+ buf.append(": path=");
+ buf.append(getSafePath());
+ buf.append(", name=");
+ buf.append(getName());
+ return buf.toString();
+ }
+}
Propchange: sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/ClassLoaderResource.java
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Added: sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/ClassPathEntry.java
URL: http://svn.apache.org/viewvc/sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/ClassPathEntry.java?rev=902794&view=auto
==============================================================================
--- sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/ClassPathEntry.java (added)
+++ sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/ClassPathEntry.java Mon Jan 25 12:43:22 2010
@@ -0,0 +1,227 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.sling.jcr.classloader.internal;
+
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.security.AccessControlException;
+
+import javax.jcr.PathNotFoundException;
+import javax.jcr.Property;
+import javax.jcr.RepositoryException;
+import javax.jcr.Session;
+
+import org.apache.sling.jcr.classloader.internal.net.URLFactory;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * The <code>ClassPathEntry</code> class encapsulates entries in the class path
+ * of the {@link DynamicRepositoryClassLoader}. The main task is to retrieve
+ * {@link ClassLoaderResource} instances for classes or resources to load from it.
+ * <p>
+ * This implementation is not currently integrated with Java security. That is
+ * protection domains and security managers are not supported yet.
+ * <p>
+ * This class is not intended to be subclassed or instantiated by clients.
+ */
+public final class ClassPathEntry {
+
+ /** default logging */
+ private static final Logger log =
+ LoggerFactory.getLogger(ClassPathEntry.class);
+
+ /** The session assigned to this class path entry */
+ protected final Session session;
+
+ /** The path to the item of this class path entry */
+ protected final String path;
+
+ /** The base URL for the class path entry to later construct resource URLs */
+ protected URL baseURL;
+
+ //---------- construction --------------------------------------------------
+
+ /**
+ * Creates an instance of the <code>ClassPathEntry</code> assigning the
+ * session and path.
+ *
+ * @param session The <code>Session</code> to access the Repository.
+ * @param path The path of the class path entry, this is either the
+ * path of a node containing a jar archive or is the path
+ * of the root of a hierarchy to look up resources in.
+ */
+ protected ClassPathEntry(Session session, String path) {
+ this.path = path;
+ this.session = session;
+ }
+
+ /**
+ * Clones this instance of the <code>ClassPathEntry</code> setting the
+ * path and session to the same value as the base instance.
+ * <p>
+ * Note that this constructor does not duplicate the session from the base
+ * instance.
+ *
+ * @param base The <code>ClassPathEntry</code> from which to copy the path
+ * and the session.
+ */
+ protected ClassPathEntry(ClassPathEntry base) {
+ this.path = base.path;
+ this.session = base.session;
+ this.baseURL = base.baseURL;
+ }
+
+ /**
+ * Returns an instance of the <code>ClassPathEntry</code> class. This
+ * instance will be a subclass correctly handling the type (directory or
+ * jar archive) of class path entry is to be created.
+ * <p>
+ * If the path given has a trailing slash, it is taken as a directory root
+ * else the path is first tested, whether it contains an archive. If not
+ * the path is treated as a directory.
+ *
+ * @param session The <code>Session</code> to access the Repository.
+ * @param path The path of the class path entry, this is either the
+ * path of a node containing a jar archive or is the path
+ * of the root of a hierharchy to look up resources in.
+ *
+ * @return An initialized <code>ClassPathEntry</code> instance for the
+ * path or <code>null</code> if an error occurred creating the
+ * instance.
+ */
+ static ClassPathEntry getInstance(Session session, String path) {
+
+ // check we can access the path, don't care about content now
+ try {
+ session.checkPermission(path, "read");
+ } catch (AccessControlException ace) {
+ log.warn(
+ "getInstance: Access denied reading from {}, ignoring entry",
+ path);
+ return null;
+ } catch (RepositoryException re) {
+ log.error("getInstance: Cannot check permission to " + path, re);
+ }
+
+ if (!path.endsWith("/")) {
+ // assume the path designates a directory
+ // append trailing slash now
+ path += "/";
+ }
+
+ // we assume a directory class path entry, but we might have to check
+ // whether the path refers to a node or not. On the other hande, this
+ // class path entry will not be usable anyway if not, user beware :-)
+
+ return new ClassPathEntry(session, path);
+ }
+
+ /**
+ * Returns the path on which this <code>ClassPathEntry</code> is based.
+ */
+ public String getPath() {
+ return path;
+ }
+
+ /**
+ * Returns this <code>ClassPathEntry</code> represented as an URL to be
+ * used in a list of URLs to further work on. If there is a problem creating
+ * the URL for this instance, <code>null</code> is returned instead.
+ */
+ public URL toURL() {
+ if (baseURL == null) {
+ try {
+ baseURL = URLFactory.createURL(session, path);
+ } catch (MalformedURLException mue) {
+ log.warn("DirectoryClassPathEntry: Creating baseURl for " +
+ path, mue);
+ }
+ }
+
+ return baseURL;
+ }
+
+ /**
+ * Returns a {@link ClassLoaderResource} for the named resource if it
+ * can befound below this directory root identified by the path given
+ * at construction time. Note that if the page would exist but does
+ * either not contain content or is not readable by the current session,
+ * no resource is returned.
+ *
+ * @param name The name of the resource to return. If the resource would
+ * be a class the name must already be modified to denote a valid
+ * path, that is dots replaced by dashes and the <code>.class</code>
+ * extension attached.
+ *
+ * @return The {@link ClassLoaderResource} identified by the name or
+ * <code>null</code> if no resource is found for that name.
+ */
+ public ClassLoaderResource getResource(final String name) {
+
+ try {
+ final Property prop = Util.getProperty(session.getItem(path + name));
+ if (prop != null) {
+ return new ClassLoaderResource(this, name, prop);
+ }
+
+ log.debug("getResource: resource {} not found below {} ", name,
+ path);
+
+ } catch (PathNotFoundException pnfe) {
+
+ log.debug("getResource: Classpath entry {} does not have resource {}",
+ path, name);
+
+ } catch (RepositoryException cbe) {
+
+ log.warn("getResource: problem accessing the resource {} below {}",
+ new Object[] { name, path }, cbe);
+
+ }
+ // invariant : no page or problem accessing the page
+
+ return null;
+ }
+
+ /**
+ * Returns a <code>ClassPathEntry</code> with the same configuration as
+ * this <code>ClassPathEntry</code>.
+ * <p>
+ * Becase the <code>DirectoryClassPathEntry</code> class does not have
+ * internal state, this method returns this instance to be used as
+ * the "copy".
+ */
+ ClassPathEntry copy() {
+ return this;
+ }
+
+ /**
+ * @see Object#toString()
+ */
+ public String toString() {
+ StringBuilder buf = new StringBuilder(super.toString());
+ buf.append(": path: ");
+ buf.append(path);
+ buf.append(", user: ");
+ buf.append(session.getUserID());
+ return buf.toString();
+ }
+
+ //----------- internal helper ----------------------------------------------
+
+}
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Added: sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/DynamicRepositoryClassLoader.java
URL: http://svn.apache.org/viewvc/sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/DynamicRepositoryClassLoader.java?rev=902794&view=auto
==============================================================================
--- sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/DynamicRepositoryClassLoader.java (added)
+++ sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/DynamicRepositoryClassLoader.java Mon Jan 25 12:43:22 2010
@@ -0,0 +1,660 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.sling.jcr.classloader.internal;
+
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+
+import javax.jcr.Property;
+import javax.jcr.RepositoryException;
+import javax.jcr.Session;
+import javax.jcr.observation.Event;
+import javax.jcr.observation.EventIterator;
+import javax.jcr.observation.EventListener;
+import javax.jcr.observation.ObservationManager;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+
+/**
+ * The <code>DynamicRepositoryClassLoader</code> class extends the
+ * {@link org.apache.sling.jcr.classloader.internal.URLRepositoryClassLoader} and provides the
+ * functionality to load classes and resources from the JCR Repository.
+ * Additionally, this class supports the notion of getting 'dirty', which means,
+ * that if a resource loaded through this class loader has been modified in the
+ * Repository, this class loader marks itself dirty, which flag can get
+ * retrieved. This helps the user of this class loader to decide on whether to
+ * {@link #reinstantiate(Session, ClassLoader) reinstantiate} it or continue
+ * using this class loader.
+ * <p>
+ * When a user of the class loader recognizes an instance to be dirty, it can
+ * easily be reinstantiated with the {@link #reinstantiate} method. This
+ * reinstantiation will also rebuild the internal real class path from the same
+ * list of path patterns as was used to create the internal class path for the
+ * original class loader. The resulting internal class path need not be the
+ * same, though.
+ * <p>
+ * As an additional feature the class loaders provides the functionality for
+ * complete reconfiguration of the list of path patterns defined at class loader
+ * construction time through the {@link #reconfigure(String[])} method. This
+ * reconfiguration replaces the internal class path with a new one built from
+ * the new path list and also replaces that path list. Reinstantiating a
+ * reconfigured class loader gets a class loader containing the same path list
+ * as the original class loader had after reconfiguration. That is the original
+ * configuration is lost. While reconfiguration is not able to throw away
+ * classes already loaded, it will nevertheless mark the class loader dirty, if
+ * any classes have already been loaded through it.
+ * <p>
+ * This class is not intended to be extended by clients.
+ */
+public class DynamicRepositoryClassLoader
+ extends URLRepositoryClassLoader
+ implements EventListener {
+
+ /** default log category */
+ private final Logger log =
+ LoggerFactory.getLogger(this.getClass().getName());
+
+ /**
+ * Cache of resources used to check class loader expiry. The map is indexed
+ * by the paths of the expiry properties of the cached resources. This map
+ * is not complete in terms of resources which have been loaded through this
+ * class loader. That is for resources loaded through an archive class path
+ * entry, only one of those resources (the last one loaded) is kept in this
+ * cache, while the others are ignored.
+ *
+ * @see #onEvent(EventIterator)
+ * @see #findClassLoaderResource(String)
+ */
+ private Map modTimeCache;
+
+ /**
+ * Flag indicating whether there are loaded classes which have later been
+ * expired (e.g. invalidated or modified)
+ */
+ private boolean dirty;
+
+ /**
+ * The list of repositories added through either the {@link #addURL} or the
+ * {@link #addHandle} method.
+ */
+ private ClassPathEntry[] addedRepositories;
+
+ private EventListener[] proxyListeners;
+
+ /**
+ * Creates a <code>DynamicRepositoryClassLoader</code> from a list of item
+ * path strings containing globbing pattens for the paths defining the
+ * class path.
+ *
+ * @param session The <code>Session</code> to use to access the class items.
+ * @param classPath The list of path strings making up the (initial) class
+ * path of this class loader. The strings may contain globbing
+ * characters which will be resolved to build the actual class path.
+ * @param parent The parent <code>ClassLoader</code>, which may be
+ * <code>null</code>.
+ *
+ * @throws NullPointerException if either the session or the handles list
+ * is <code>null</code>.
+ */
+ public DynamicRepositoryClassLoader(Session session,
+ String[] classPath, ClassLoader parent) {
+
+ // initialize the super class with an empty class path
+ super(session, classPath, parent);
+
+ // set fields
+ dirty = false;
+ modTimeCache = new HashMap();
+
+ // register with observation service and path pattern list
+ registerModificationListener();
+
+ log.debug("DynamicRepositoryClassLoader: {} ready", this);
+ }
+
+ /**
+ * Creates a <code>DynamicRepositoryClassLoader</code> with the same
+ * configuration as the given <code>DynamicRepositoryClassLoader</code>.
+ * This constructor is used by the {@link #reinstantiate} method.
+ * <p>
+ * Before returning from this constructor the <code>old</code> class loader
+ * is destroyed and may not be used any more.
+ *
+ * @param session The session to associate with this class loader.
+ * @param old The <code>DynamicRepositoryClassLoader</code> to copy the
+ * cofiguration from.
+ * @param parent The parent <code>ClassLoader</code>, which may be
+ * <code>null</code>.
+ */
+ private DynamicRepositoryClassLoader(Session session,
+ DynamicRepositoryClassLoader old, ClassLoader parent) {
+
+ // initialize the super class with an empty class path
+ super(session, old.getPaths(), parent);
+
+ // set the configuration and fields
+ dirty = false;
+ modTimeCache = new HashMap();
+
+ // create a repository from the handles - might get a different one
+ setRepository(resetClassPathEntries(old.getRepository()));
+ setAddedRepositories(resetClassPathEntries(old.getAddedRepositories()));
+ buildRepository();
+
+ // register with observation service and path pattern list
+ registerModificationListener();
+
+ // finally finalize the old class loader
+ old.destroy();
+
+ log.debug(
+ "DynamicRepositoryClassLoader: Copied {}. Do not use that anymore",
+ old);
+ }
+
+ /**
+ * Destroys this class loader. This process encompasses all steps needed
+ * to remove as much references to this class loader as possible.
+ * <p>
+ * <em>NOTE</em>: This method just clears all internal fields and especially
+ * the class path to render this class loader unusable.
+ * <p>
+ * This implementation does not throw any exceptions.
+ */
+ public void destroy() {
+ // we expect to be called only once, so we stop destroyal here
+ if (isDestroyed()) {
+ log.debug("Instance is already destroyed");
+ return;
+ }
+
+ // remove ourselves as listeners from other places
+ unregisterListener();
+
+ addedRepositories = null;
+
+ super.destroy();
+ }
+
+ //---------- reload support ------------------------------------------------
+
+ /**
+ * Checks whether this class loader already loaded the named resource and
+ * would load another version if it were instructed to do so. As a side
+ * effect the class loader sets itself dirty in this case.
+ * <p>
+ * Calling this method yields the same result as calling
+ * {@link #shouldReload(String, boolean)} with the <code>force</code>
+ * argument set to <code>false</code>.
+ *
+ * @param name The name of the resource to check.
+ *
+ * @return <code>true</code> if the resource is loaded and reloading would
+ * take another version than currently loaded.
+ *
+ * @see #isDirty
+ */
+ public synchronized boolean shouldReload(String name) {
+ return shouldReload(name, false);
+ }
+
+ /**
+ * Checks whether this class loader already loaded the named resource and
+ * whether the class loader should be set dirty depending on the
+ * <code>force</code> argument. If the argument is <code>true</code>, the
+ * class loader is marked dirty and <code>true</code> is returned if the
+ * resource has been loaded, else the loaded resource is checked for expiry
+ * and the class loader is only set dirty if the loaded resource has
+ * expired.
+ *
+ * @param name The name of the resource to check.
+ * @param force <code>true</code> if the class loader should be marked dirty
+ * if the resource is loaded, else the class loader is only marked
+ * dirty if the resource is loaded and has expired.
+ *
+ * @return <code>true</code> if the resource is loaded and
+ * <code>force</code> is <code>true</code> or if the resource has
+ * expired. <code>true</code> is also returned if this class loader
+ * has already been destroyed.
+ *
+ * @see #isDirty
+ */
+ public synchronized boolean shouldReload(String name, boolean force) {
+ if (isDestroyed()) {
+ log.warn("Classloader already destroyed, reload required");
+ return true;
+ }
+
+ ClassLoaderResource res = getCachedResource(name);
+ if (res != null) {
+ log.debug("shouldReload: Expiring cache entry {}", res);
+ if (force) {
+ log.debug("shouldReload: Forced dirty flag");
+ dirty = true;
+ return true;
+ }
+
+ return expireResource(res);
+ }
+
+ return false;
+ }
+
+ /**
+ * Returns <code>true</code> if any of the loaded classes need reload. Also
+ * sets this class loader dirty. If the class loader is already set dirty
+ * or if this class loader has been destroyed before calling this method,
+ * it returns immediately.
+ *
+ * @return <code>true</code> if any class loader needs to be reinstantiated.
+ *
+ * @see #isDirty
+ */
+ public synchronized boolean shouldReload() {
+
+ // check whether we are already dirty
+ if (isDirty()) {
+ log.debug("shouldReload: Dirty, need reload");
+ return true;
+ }
+
+ // Check whether any class has changed
+ for (Iterator iter = getCachedResources(); iter.hasNext();) {
+ if (expireResource((ClassLoaderResource) iter.next())) {
+ log.debug("shouldReload: Found expired resource, need reload");
+ return true;
+ }
+ }
+
+ // No changes, no need to reload
+ log.debug("shouldReload: No expired resource found, no need to reload");
+ return false;
+ }
+
+ /**
+ * Returns whether the class loader is dirty. This can be the case if any
+ * of the {@link #shouldReload(String)} or {@link #shouldReload()}
+ * methods returned <code>true</code> or if a loaded class has been expired
+ * through the observation.
+ * <p>
+ * This method may also return <code>true</code> if the <code>Session</code>
+ * associated with this class loader is not valid anymore.
+ * <p>
+ * Finally the method always returns <code>true</code> if the class loader
+ * has already been destroyed. Note, however, that a destroyed class loader
+ * cannot be reinstantiated. See {@link #reinstantiate(Session, ClassLoader)}.
+ * <p>
+ * If the class loader is dirty, it should be reinstantiated through the
+ * {@link #reinstantiate} method.
+ *
+ * @return <code>true</code> if the class loader is dirty and needs
+ * reinstantiation.
+ */
+ public boolean isDirty() {
+ return isDestroyed() || dirty || !getSession().isLive();
+ }
+
+ /**
+ * Reinstantiates this class loader. That is, a new ClassLoader with no
+ * loaded class is created with the same configuration as this class loader.
+ * <p>
+ * When the new class loader is returned, this class loader has been
+ * destroyed and may not be used any more.
+ *
+ * @param parent The parent <code>ClassLoader</code> for the reinstantiated
+ * <code>DynamicRepositoryClassLoader</code>, which may be
+ * <code>null</code>.
+ *
+ * @return a new instance with the same configuration as this class loader.
+ *
+ * @throws IllegalStateException if <code>this</code>
+ * {@link DynamicRepositoryClassLoader} has already been destroyed
+ * through the {@link #destroy()} method.
+ */
+ public DynamicRepositoryClassLoader reinstantiate(Session session, ClassLoader parent) {
+ log.debug("reinstantiate: Copying {} with parent {}", this, parent);
+
+ if (isDestroyed()) {
+ throw new IllegalStateException("Destroyed class loader cannot be recreated");
+ }
+
+ // create the new loader
+ DynamicRepositoryClassLoader newLoader =
+ new DynamicRepositoryClassLoader(session, this, parent);
+
+ // return the new loader
+ return newLoader;
+ }
+
+ //---------- URLClassLoader overwrites -------------------------------------
+
+ /**
+ * Reconfigures this class loader with the pattern list. That is the new
+ * pattern list completely replaces the current pattern list. This new
+ * pattern list will also be used later to configure the reinstantiated
+ * class loader.
+ * <p>
+ * If this class loader already has loaded classes using the old, replaced
+ * path list, it is set dirty.
+ * <p>
+ * If this class loader has already been destroyed, this method has no
+ * effect.
+ *
+ * @param classPath The list of path strings making up the (initial) class
+ * path of this class loader. The strings may contain globbing
+ * characters which will be resolved to build the actual class path.
+ */
+ public void reconfigure(String[] classPath) {
+ if (log.isDebugEnabled()) {
+ log.debug("reconfigure: Reconfiguring the with {}",
+ Arrays.asList(classPath));
+ }
+
+ // whether the loader is destroyed
+ if (isDestroyed()) {
+ log.warn("Cannot reconfigure this destroyed class loader");
+ return;
+ }
+
+ // assign new path and register
+ setPaths(classPath);
+ buildRepository();
+
+ dirty = !hasLoadedResources();
+ log.debug("reconfigure: Class loader is dirty now: {}", (isDirty()
+ ? "yes"
+ : "no"));
+ }
+
+ //---------- RepositoryClassLoader overwrites -----------------------------
+
+ /**
+ * Calls the base class implementation to actually retrieve the resource.
+ * If the resource could be found and provides a non-<code>null</code>
+ * {@link ClassLoaderResource#getExpiryProperty() expiry property}, the
+ * resource is registered with an internal cache to check with when
+ * a repository modification is observed in {@link #onEvent(EventIterator)}.
+ *
+ * @param name The name of the resource to be found
+ *
+ * @return the {@link ClassLoaderResource} found for the name or
+ * <code>null</code> if no such resource is available in the class
+ * path.
+ *
+ * @throws NullPointerException If this class loader has already been
+ * destroyed.
+ */
+ /* package */ ClassLoaderResource findClassLoaderResource(String name) {
+ // call the base class implementation to actually search for it
+ ClassLoaderResource res = super.findClassLoaderResource(name);
+
+ // if it could be found, we register it with the caches
+ if (res != null) {
+ // register the resource in the expiry map, if an appropriate
+ // property is available
+ Property prop = res.getExpiryProperty();
+ if (prop != null) {
+ try {
+ modTimeCache.put(prop.getPath(), res);
+ } catch (RepositoryException re) {
+ log.warn("Cannot register the resource " + res +
+ " for expiry", re);
+ }
+ }
+ }
+
+ // and finally return the resource
+ return res;
+ }
+
+ /**
+ * Builds the repository list from the list of path patterns and appends
+ * the path entries from any added handles. This method may be used multiple
+ * times, each time replacing the currently defined repository list.
+ *
+ * @throws NullPointerException If this class loader has already been
+ * destroyed.
+ */
+ protected synchronized void buildRepository() {
+ super.buildRepository();
+
+ // add added repositories
+ ClassPathEntry[] addedPath = getAddedRepositories();
+ if (addedPath != null && addedPath.length > 0) {
+ ClassPathEntry[] oldClassPath = getRepository();
+ ClassPathEntry[] newClassPath =
+ new ClassPathEntry[oldClassPath.length + addedPath.length];
+
+ System.arraycopy(oldClassPath, 0, newClassPath, 0,
+ oldClassPath.length);
+ System.arraycopy(addedPath, 0, newClassPath, oldClassPath.length,
+ addedPath.length);
+
+ setRepository(newClassPath);
+ }
+ }
+
+ //---------- ModificationListener interface -------------------------------
+
+ /**
+ * Handles a repository item modifcation events checking whether a class
+ * needs to be expired. As a side effect, this method sets the class loader
+ * dirty if a loaded class has been modified in the repository.
+ *
+ * @param events The iterator of repository events to be handled.
+ */
+ public void onEvent(EventIterator events) {
+ while (events.hasNext()) {
+ Event event = events.nextEvent();
+ String path;
+ try {
+ path = event.getPath();
+ } catch (RepositoryException re) {
+ log.warn("onEvent: Cannot get path of event, ignoring", re);
+ continue;
+ }
+
+ log.debug(
+ "onEvent: Item {} has been modified, checking with cache", path);
+
+ ClassLoaderResource resource = (ClassLoaderResource) modTimeCache.get(path);
+ if (resource != null) {
+ log.debug("pageModified: Expiring cache entry {}", resource);
+ expireResource(resource);
+ } else {
+ // might be in not-found cache - remove from there
+ if (event.getType() == Event.NODE_ADDED
+ || event.getType() == Event.PROPERTY_ADDED) {
+ log.debug("pageModified: Clearing not-found cache for possible new class");
+ cleanCache();
+ }
+ }
+
+ }
+ }
+
+ //----------- Object overwrite ---------------------------------------------
+
+ /**
+ * Returns a string representation of this class loader.
+ */
+ public String toString() {
+ if (isDestroyed()) {
+ return super.toString();
+ }
+
+ StringBuilder buf = new StringBuilder(super.toString());
+ buf.append(", dirty: ");
+ buf.append(isDirty());
+ return buf.toString();
+ }
+
+ //---------- internal ------------------------------------------------------
+
+ /**
+ * Sets the list of class path entries to add to the class path after
+ * reconfiguration or reinstantiation.
+ *
+ * @param addedRepositories The list of class path entries to keep for
+ * readdition.
+ */
+ protected void setAddedRepositories(ClassPathEntry[] addedRepositories) {
+ this.addedRepositories = addedRepositories;
+ }
+
+ /**
+ * Returns the list of added class path entries to readd them to the class
+ * path after reconfiguring the class loader.
+ */
+ protected ClassPathEntry[] getAddedRepositories() {
+ return addedRepositories;
+ }
+
+ /**
+ * Adds the class path entry to the current class path list. If the class
+ * loader has already been destroyed, this method creates a single entry
+ * class path list with the new class path entry.
+ * <p>
+ * Besides adding the entry to the current class path, it is also added to
+ * the list to be readded after reconfiguration and/or reinstantiation.
+ *
+ * @see #getAddedRepositories()
+ * @see #setAddedRepositories(ClassPathEntry[])
+ */
+ protected void addClassPathEntry(ClassPathEntry cpe) {
+ super.addClassPathEntry(cpe);
+
+ // add the repsitory to the list of added repositories
+ ClassPathEntry[] oldClassPath = getAddedRepositories();
+ ClassPathEntry[] newClassPath = addClassPathEntry(oldClassPath, cpe);
+ setAddedRepositories(newClassPath);
+ }
+
+ /**
+ * Registers this class loader with the observation service to get
+ * information on page updates in the class path and to the path
+ * pattern list to get class path updates.
+ *
+ * @throws NullPointerException if this class loader has already been
+ * destroyed.
+ */
+ private final void registerModificationListener() {
+ log.debug("registerModificationListener: Registering to the observation service");
+
+ final String[] paths = this.getPaths();
+ this.proxyListeners = new EventListener[this.getPaths().length];
+ for(int i=0; i < paths.length; i++ ) {
+ final String path = paths[i];
+ try {
+ final EventListener listener = new ProxyEventListener(this);
+ final ObservationManager om = getSession().getWorkspace().getObservationManager();
+ om.addEventListener(listener, 255, path, true, null, null, false);
+ proxyListeners[i] = listener;
+ } catch (RepositoryException re) {
+ log.error("registerModificationListener: Cannot register " +
+ this + " with observation manager", re);
+ }
+ }
+ }
+
+ /**
+ * Removes this instances registrations from the observation service and
+ * the path pattern list.
+ *
+ * @throws NullPointerException if this class loader has already been
+ * destroyed.
+ */
+ private final void unregisterListener() {
+ log.debug("registerModificationListener: Deregistering from the observation service");
+ if ( this.proxyListeners != null ) {
+ for(final EventListener listener : this.proxyListeners) {
+ if ( listener != null ) {
+ try {
+ final ObservationManager om = getSession().getWorkspace().getObservationManager();
+ om.removeEventListener(listener);
+ } catch (RepositoryException re) {
+ log.error("unregisterListener: Cannot unregister " +
+ this + " from observation manager", re);
+ }
+ }
+ }
+ this.proxyListeners = null;
+ }
+ }
+
+ /**
+ * Checks whether the page backing the resource has been updated with a
+ * version, such that this new version would be used to access the resource.
+ * In this case the resource has expired and the class loader needs to be
+ * set dirty.
+ *
+ * @param resource The <code>ClassLoaderResource</code> to check for
+ * expiry.
+ */
+ private boolean expireResource(ClassLoaderResource resource) {
+
+ // check whether the resource is expired (only if a class has been loaded)
+ boolean exp = resource.getLoadedClass() != null && resource.isExpired();
+
+ // update dirty flag accordingly
+ dirty |= exp;
+ log.debug("expireResource: Loader dirty: {}", new Boolean(isDirty()));
+
+ // return the expiry status
+ return exp;
+ }
+
+ /**
+ * Returns the list of classpath entries after resetting each of them.
+ *
+ * @param list The list of {@link ClassPathEntry}s to reset
+ *
+ * @return The list of reset {@link ClassPathEntry}s.
+ */
+ private ClassPathEntry[] resetClassPathEntries(
+ ClassPathEntry[] oldClassPath) {
+ if (oldClassPath != null) {
+ for (int i=0; i < oldClassPath.length; i++) {
+ ClassPathEntry entry = oldClassPath[i];
+ log.debug("resetClassPathEntries: Cloning {}", entry);
+ oldClassPath[i] = entry.copy();
+ }
+ } else {
+ log.debug("resetClassPathEntries: No list to reset");
+ }
+ return oldClassPath;
+ }
+
+ protected final static class ProxyEventListener implements EventListener {
+
+ private final EventListener delegatee;
+
+ public ProxyEventListener(final EventListener delegatee) {
+ this.delegatee = delegatee;
+ }
+ /**
+ * @see javax.jcr.observation.EventListener#onEvent(javax.jcr.observation.EventIterator)
+ */
+ public void onEvent(EventIterator events) {
+ this.delegatee.onEvent(events);
+ }
+ }
+}
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Modified: sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/RepositoryClassLoaderFacade.java
URL: http://svn.apache.org/viewvc/sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/RepositoryClassLoaderFacade.java?rev=902794&r1=902793&r2=902794&view=diff
==============================================================================
--- sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/RepositoryClassLoaderFacade.java (original)
+++ sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/RepositoryClassLoaderFacade.java Mon Jan 25 12:43:22 2010
@@ -25,7 +25,6 @@
import javax.jcr.RepositoryException;
-import org.apache.jackrabbit.classloader.DynamicRepositoryClassLoader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
Added: sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/URLRepositoryClassLoader.java
URL: http://svn.apache.org/viewvc/sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/URLRepositoryClassLoader.java?rev=902794&view=auto
==============================================================================
--- sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/URLRepositoryClassLoader.java (added)
+++ sling/trunk/bundles/jcr/classloader/src/main/java/org/apache/sling/jcr/classloader/internal/URLRepositoryClassLoader.java Mon Jan 25 12:43:22 2010
@@ -0,0 +1,795 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.sling.jcr.classloader.internal;
+
+import java.beans.Introspector;
+import java.io.IOException;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.security.AccessController;
+import java.security.PrivilegedExceptionAction;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Date;
+import java.util.Enumeration;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.NoSuchElementException;
+import java.util.jar.Attributes;
+import java.util.jar.Manifest;
+
+import javax.jcr.RepositoryException;
+import javax.jcr.Session;
+
+import org.apache.sling.jcr.classloader.internal.net.JCRURLConnection;
+import org.apache.sling.jcr.classloader.internal.net.URLFactory;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+
+/**
+ * The <code>RepositoryClassLoader</code> class extends the
+ * <code>URLClassLoader</code> and provides the functionality to load classes
+ * and resources from JCR Repository.
+ * <p>
+ * This class loader supports loading classes from the Repository hierarchy,
+ * such as a <em>classes</em> 'folder', but also from Jar and Zip files stored
+ * in the Repository.
+ * <p>
+ * For enhanced performance, this class loader keeps a list of resources and
+ * classes which have already been loaded through this class loader. If later
+ * requests ask for already cached resources, these are returned without
+ * checking whether the underlying repository actually still exists.
+ * <p>
+ */
+public class URLRepositoryClassLoader extends URLClassLoader {
+
+ /** default log category */
+ private final Logger log =
+ LoggerFactory.getLogger(this.getClass().getName());
+
+ /** An empty list of url paths to call superclass constructor */
+ private static final URL[] NULL_PATH = {};
+
+ /**
+ * The special resource representing a resource which could not be
+ * found in the class path.
+ *
+ * @see #cache
+ * @see #findClassLoaderResource(String)
+ */
+ /* package */ static final ClassLoaderResource NOT_FOUND_RESOURCE =
+ new ClassLoaderResource(null, "[sentinel]", null) {
+ public boolean isExpired() {
+ return false;
+ }
+ };
+
+ /**
+ * The classpath which this classloader searches for class definitions.
+ * Each element of the vector should be either a directory, a .zip
+ * file, or a .jar file.
+ * <p>
+ * It may be empty when only system classes are controlled.
+ */
+ private ClassPathEntry[] repository;
+
+ /**
+ * The list of paths to use as a classpath.
+ */
+ private String[] paths;
+
+ /**
+ * The <code>Session</code> grants access to the Repository to access the
+ * resources.
+ * <p>
+ * This field is not final such that it may be cleared when the class loader
+ * is destroyed.
+ */
+ private Session session;
+
+ /**
+ * Cache of resources found or not found in the class path. The map is
+ * indexed by resource name and contains mappings to instances of the
+ * {@link ClassLoaderResource} class. If a resource has been tried to be
+ * loaded, which could not be found, the resource is cached with the
+ * special mapping to {@link #NOT_FOUND_RESOURCE}.
+ *
+ * @see #NOT_FOUND_RESOURCE
+ * @see #findClassLoaderResource(String)
+ */
+ private Map<String, ClassLoaderResource> cache;
+
+ /**
+ * Flag indicating whether the {@link #destroy()} method has already been
+ * called (<code>true</code>) or not (<code>false</code>)
+ */
+ private boolean destroyed;
+
+ /**
+ * Creates a <code>RepositoryClassLoader</code> from a list of item path
+ * strings containing globbing pattens for the paths defining the class
+ * path.
+ *
+ * @param session The <code>Session</code> to use to access the class items.
+ * @param classPath The list of path strings making up the (initial) class
+ * path of this class loader. The strings may contain globbing
+ * characters which will be resolved to build the actual class path.
+ * @param parent The parent <code>ClassLoader</code>, which may be
+ * <code>null</code>.
+ *
+ * @throws NullPointerException if either the session or the handles list is
+ * <code>null</code>.
+ */
+ public URLRepositoryClassLoader(Session session, String[] classPath,
+ ClassLoader parent) {
+ // initialize the super class with an empty class path
+ super(NULL_PATH, parent);
+
+ // check session and handles
+ if (session == null) {
+ throw new NullPointerException("session");
+ }
+ if (classPath == null || classPath.length == 0) {
+ throw new NullPointerException("handles");
+ }
+
+ // set fields
+ this.session = session;
+ setPaths(classPath);
+ this.cache = new HashMap<String, ClassLoaderResource>();
+ this.destroyed = false;
+
+ // build the class repositories list
+ buildRepository();
+
+ log.debug("RepositoryClassLoader: {} ready", this);
+ }
+
+ /**
+ * Returns <code>true</code> if this class loader has already been destroyed
+ * by calling {@link #destroy()}.
+ */
+ protected boolean isDestroyed() {
+ return destroyed;
+ }
+
+ protected String[] getPaths() {
+ return this.paths;
+ }
+
+ protected void setPaths(final String[] classPath) {
+ this.paths = classPath;
+ }
+
+ /**
+ * Destroys this class loader. This process encompasses all steps needed
+ * to remove as much references to this class loader as possible.
+ * <p>
+ * <em>NOTE</em>: This method just clears all internal fields and especially
+ * the class path to render this class loader unusable.
+ * <p>
+ * This implementation does not throw any exceptions.
+ */
+ public void destroy() {
+ // we expect to be called only once, so we stop destroyal here
+ if (isDestroyed()) {
+ log.debug("Instance is already destroyed");
+ return;
+ }
+
+ // set destroyal guard
+ destroyed = true;
+
+ // clear caches and references
+ setRepository(null);
+ setPaths(null);
+ session = null;
+
+ // clear the cache of loaded resources and flush cached class
+ // introspections of the JavaBean framework
+ if (cache != null) {
+ final Iterator<ClassLoaderResource> ci = cache.values().iterator();
+ while ( ci.hasNext() ) {
+ final ClassLoaderResource res = ci.next();
+ if (res.getLoadedClass() != null) {
+ Introspector.flushFromCaches(res.getLoadedClass());
+ res.setLoadedClass(null);
+ }
+ }
+ cache.clear();
+ }
+ }
+
+ //---------- URLClassLoader overwrites -------------------------------------
+
+ /**
+ * Finds and loads the class with the specified name from the class path.
+ *
+ * @param name the name of the class
+ * @return the resulting class
+ *
+ * @throws ClassNotFoundException If the named class could not be found or
+ * if this class loader has already been destroyed.
+ */
+ protected Class findClass(final String name) throws ClassNotFoundException {
+
+ if (isDestroyed()) {
+ throw new ClassNotFoundException(name + " (Classloader destroyed)");
+ }
+
+ log.debug("findClass: Try to find class {}", name);
+
+ try {
+ return (Class) AccessController
+ .doPrivileged(new PrivilegedExceptionAction() {
+
+ public Object run() throws ClassNotFoundException {
+ return findClassPrivileged(name);
+ }
+ });
+ } catch (java.security.PrivilegedActionException pae) {
+ throw (ClassNotFoundException) pae.getException();
+ }
+ }
+
+ /**
+ * Finds the resource with the specified name on the search path.
+ *
+ * @param name the name of the resource
+ *
+ * @return a <code>URL</code> for the resource, or <code>null</code>
+ * if the resource could not be found or if the class loader has
+ * already been destroyed.
+ */
+ public URL findResource(String name) {
+
+ if (isDestroyed()) {
+ log.warn("Destroyed class loader cannot find a resource");
+ return null;
+ }
+
+ log.debug("findResource: Try to find resource {}", name);
+
+ ClassLoaderResource res = findClassLoaderResource(name);
+ if (res != null) {
+ log.debug("findResource: Getting resource from {}, created {}",
+ res, new Date(res.getLastModificationTime()));
+ return res.getURL();
+ }
+
+ return null;
+ }
+
+ /**
+ * Returns an Enumeration of URLs representing all of the resources
+ * on the search path having the specified name.
+ *
+ * @param name the resource name
+ *
+ * @return an <code>Enumeration</code> of <code>URL</code>s. This is an
+ * empty enumeration if no resources are found by this class loader
+ * or if this class loader has already been destroyed.
+ */
+ public Enumeration findResources(String name) {
+
+ if (isDestroyed()) {
+ log.warn("Destroyed class loader cannot find resources");
+ return new Enumeration() {
+ public boolean hasMoreElements() {
+ return false;
+ }
+ public Object nextElement() {
+ throw new NoSuchElementException("No Entries");
+ }
+ };
+ }
+
+ log.debug("findResources: Try to find resources for {}", name);
+
+ List list = new LinkedList();
+ for (int i=0; i < repository.length; i++) {
+ final ClassPathEntry cp = repository[i];
+ log.debug("findResources: Trying {}", cp);
+
+ ClassLoaderResource res = cp.getResource(name);
+ if (res != null) {
+ log.debug("findResources: Adding resource from {}, created {}",
+ res, new Date(res.getLastModificationTime()));
+ URL url = res.getURL();
+ if (url != null) {
+ list.add(url);
+ }
+ }
+
+ }
+
+ // return the enumeration on the list
+ return Collections.enumeration(list);
+ }
+
+ /**
+ * Returns the search path of URLs for loading classes and resources.
+ * This includes the original list of URLs specified to the constructor,
+ * along with any URLs subsequently appended by the {@link #addURL(URL)}
+ * and {@link #addHandle(String)} methods.
+ *
+ * @return the search path of URLs for loading classes and resources. The
+ * list is empty, if this class loader has already been destroyed.
+ * @see java.net.URLClassLoader#getURLs()
+ */
+ public URL[] getURLs() {
+ if (isDestroyed()) {
+ log.warn("Destroyed class loader has no URLs any more");
+ return new URL[0];
+ }
+
+ List urls = new ArrayList();
+ for (int i=0; i < repository.length; i++) {
+ URL url = repository[i].toURL();
+ if (url != null) {
+ urls.add(url);
+ }
+ }
+ return (URL[]) urls.toArray(new URL[urls.size()]);
+ }
+
+ /**
+ * Appends the specified URL to the list of URLs to search for
+ * classes and resources. Only Repository URLs with the protocol set to
+ * <code>JCR</code> are considered for addition. The system will find out
+ * whether the URL points to a directory or a jar archive.
+ * <p>
+ * URLs added using this method will be preserved through reconfiguration
+ * and reinstantiation.
+ * <p>
+ * If this class loader has already been destroyed this method has no
+ * effect.
+ *
+ * @param url the <code>JCR</code> URL to be added to the search path of
+ * URLs.
+ * @see java.net.URLClassLoader#addURL(java.net.URL)
+ */
+ protected void addURL(URL url) {
+ if (isDestroyed()) {
+ log.warn("Cannot add URL to destroyed class loader");
+
+ } else if (checkURL(url)) {
+ // Repository URL
+ log.debug("addURL: Adding URL {}", url);
+ try {
+ JCRURLConnection conn = (JCRURLConnection) url.openConnection();
+ ClassPathEntry cp = ClassPathEntry.getInstance(
+ conn.getSession(), conn.getPath());
+ addClassPathEntry(cp);
+ } catch (IOException ioe) {
+ log.warn("addURL: Cannot add URL " + url, ioe);
+ }
+
+ } else {
+ log.warn("addURL: {} is not a Repository URL, ignored", url);
+ }
+ }
+
+ //---------- Property access ----------------------------------------------
+
+ /**
+ * Returns the named {@link ClassLoaderResource} if it is contained in the
+ * cache. If the resource does not exist in the cache or has not been found
+ * in the class path at an earlier point in time, <code>null</code> is
+ * returned.
+ *
+ * @param name The name of the resource to retrieve from the cache.
+ *
+ * @return The named <code>ClassLoaderResource</code> or <code>null</code>
+ * if not loaded.
+ *
+ * @throws NullPointerException If this class loader has already been
+ * destroyed.
+ */
+ /* package */ ClassLoaderResource getCachedResource(String name) {
+ Object res = cache.get(name);
+ if (res == null || res == NOT_FOUND_RESOURCE) {
+ log.debug("Resource {} not cached", name);
+ return null;
+ }
+
+ return (ClassLoaderResource) res;
+ }
+
+ /**
+ * Returns an <code>Iterator</code> on all resources in the cache. This
+ * iterator may also contain {@link #NOT_FOUND_RESOURCE sentinel} entries
+ * for resources, which failed to load. Callers of this method should take
+ * care to filter out such resources before acting on it.
+ *
+ * @throws NullPointerException If this class loader has already been
+ * destroyed.
+ */
+ /* package */ Iterator getCachedResources() {
+ return cache.values().iterator();
+ }
+
+ /**
+ * Removes all entries from the cache of loaded resources, which mark
+ * resources, which have not been found as of yet.
+ *
+ * @throws NullPointerException If this class loader has already been
+ * destroyed.
+ */
+ protected void cleanCache() {
+ final Iterator<ClassLoaderResource> ci = this.cache.values().iterator();
+ while (ci.hasNext()) {
+ if (ci.next() == NOT_FOUND_RESOURCE) {
+ ci.remove();
+ }
+ }
+ }
+
+ /**
+ * Returns <code>true</code>, if the cache is not empty. If the
+ * {@link #cleanCache()} method is not called before calling this method, a
+ * false positive result may be returned.
+ *
+ * @throws NullPointerException If this class loader has already been
+ * destroyed.
+ */
+ protected boolean hasLoadedResources() {
+ return cache.isEmpty();
+ }
+
+ /**
+ * Returns the session used by this class loader to access the repository.
+ * If this class loader has already been destroyed, this <code>null</code>
+ * is returned.
+ */
+ protected Session getSession() {
+ return session;
+ }
+
+ /**
+ * Sets the current active class path to the list of class path entries.
+ */
+ protected void setRepository(ClassPathEntry[] classPath) {
+ this.repository = classPath;
+ }
+
+ /**
+ * Returns the current active class path entries list or <code>null</code>
+ * if this class loader has already been destroyed.
+ */
+ protected ClassPathEntry[] getRepository() {
+ return repository;
+ }
+
+ /**
+ * Adds the class path entry to the current class path list. If the class
+ * loader has already been destroyed, this method creates a single entry
+ * class path list with the new class path entry.
+ */
+ protected void addClassPathEntry(ClassPathEntry cpe) {
+ log.debug("addHandle: Adding path {}", cpe.getPath());
+
+ // append the entry to the current class path
+ ClassPathEntry[] oldClassPath = getRepository();
+ ClassPathEntry[] newClassPath = addClassPathEntry(oldClassPath, cpe);
+ setRepository(newClassPath);
+ }
+
+ /**
+ * Helper method for class path handling to a new entry to an existing
+ * list and return the new list.
+ * <p>
+ * If <code>list</code> is <code>null</code> a new array is returned with
+ * a single element <code>newEntry</code>. Otherwise the array returned
+ * contains all elements of <code>list</code> and <code>newEntry</code>
+ * at the last position.
+ *
+ * @param list The array of class path entries, to which a new entry is
+ * to be appended. This may be <code>null</code>.
+ * @param newEntry The new entry to append to the class path list.
+ *
+ * @return The extended class path list.
+ */
+ protected ClassPathEntry[] addClassPathEntry(ClassPathEntry[] list,
+ ClassPathEntry newEntry) {
+
+ // quickly define single entry array for the first entry
+ if (list == null) {
+ return new ClassPathEntry[]{ newEntry };
+ }
+
+ // create new array and copy old and new contents
+ ClassPathEntry[] newList = new ClassPathEntry[list.length+1];
+ System.arraycopy(list, 0, newList, 0, list.length);
+ newList[list.length] = newEntry;
+ return newList;
+ }
+
+ //---------- Object overwrite ---------------------------------------------
+
+ /**
+ * Returns a string representation of this instance.
+ */
+ public String toString() {
+ StringBuilder buf = new StringBuilder(getClass().getName());
+
+ if (isDestroyed()) {
+ buf.append(" - destroyed");
+ } else {
+ buf.append(": parent: { ");
+ buf.append(getParent());
+ buf.append(" }, user: ");
+ buf.append(session.getUserID());
+ }
+
+ return buf.toString();
+ }
+
+ //---------- internal ------------------------------------------------------
+
+ /**
+ * Builds the repository list from the list of path patterns and appends
+ * the path entries from any added handles. This method may be used multiple
+ * times, each time replacing the currently defined repository list.
+ *
+ * @throws NullPointerException If this class loader has already been
+ * destroyed.
+ */
+ protected synchronized void buildRepository() {
+ List<ClassPathEntry> newRepository = new ArrayList<ClassPathEntry>(paths.length);
+
+ // build repository from path patterns
+ for (int i=0; i < paths.length; i++) {
+ final String entry = paths[i];
+ ClassPathEntry cp = null;
+
+ // try to find repository based on this path
+ if (repository != null) {
+ for (int j=0; j < repository.length; j++) {
+ final ClassPathEntry tmp = repository[i];
+ if (tmp.getPath().equals(entry)) {
+ cp = tmp;
+ break;
+ }
+ }
+ }
+
+ // not found, creating new one
+ if (cp == null) {
+ cp = ClassPathEntry.getInstance(session, entry);
+ }
+
+ if (cp != null) {
+ log.debug("Adding path {}", entry);
+ newRepository.add(cp);
+ } else {
+ log.debug("Cannot get a ClassPathEntry for {}", entry);
+ }
+ }
+
+ // replace old repository with new one
+ final ClassPathEntry[] newClassPath = new ClassPathEntry[newRepository.size()];
+ newRepository.toArray(newClassPath);
+ setRepository(newClassPath);
+
+ // clear un-found resource cache
+ cleanCache();
+ }
+
+ /**
+ * Tries to find the class in the class path from within a
+ * <code>PrivilegedAction</code>. Throws <code>ClassNotFoundException</code>
+ * if no class can be found for the name.
+ *
+ * @param name the name of the class
+ *
+ * @return the resulting class
+ *
+ * @throws ClassNotFoundException if the class could not be found
+ * @throws NullPointerException If this class loader has already been
+ * destroyed.
+ */
+ private Class findClassPrivileged(String name) throws ClassNotFoundException {
+
+ // prepare the name of the class
+ final String path = name.replace('.', '/').concat(".class");
+ log.debug("findClassPrivileged: Try to find path {} for class {}",
+ path, name);
+
+ ClassLoaderResource res = findClassLoaderResource(path);
+ if (res != null) {
+
+ // try defining the class, error aborts
+ try {
+ log.debug(
+ "findClassPrivileged: Loading class from {}, created {}",
+ res, new Date(res.getLastModificationTime()));
+
+ Class c = defineClass(name, res);
+ if (c == null) {
+ log.warn("defineClass returned null for class {}", name);
+ throw new ClassNotFoundException(name);
+ }
+ return c;
+
+ } catch (IOException ioe) {
+ log.debug("defineClass failed", ioe);
+ throw new ClassNotFoundException(name, ioe);
+ } catch (Throwable t) {
+ log.debug("defineClass failed", t);
+ throw new ClassNotFoundException(name, t);
+ }
+ }
+
+ throw new ClassNotFoundException(name);
+ }
+
+ /**
+ * Returns a {@link ClassLoaderResource} for the given <code>name</code> or
+ * <code>null</code> if not existing. If the resource has already been
+ * loaded earlier, the cached instance is returned. If the resource has
+ * not been found in an earlier call to this method, <code>null</code> is
+ * returned. Otherwise the resource is looked up in the class path. If
+ * found, the resource is cached and returned. If not found, the
+ * {@link #NOT_FOUND_RESOURCE} is cached for the name and <code>null</code>
+ * is returned.
+ *
+ * @param name The name of the resource to return.
+ *
+ * @return The named <code>ClassLoaderResource</code> if found or
+ * <code>null</code> if not found.
+ *
+ * @throws NullPointerException If this class loader has already been
+ * destroyed.
+ */
+ /* package */ ClassLoaderResource findClassLoaderResource(String name) {
+
+ // check for cached resources first
+ ClassLoaderResource res = cache.get(name);
+ if (res == NOT_FOUND_RESOURCE) {
+ log.debug("Resource '{}' known to not exist in class path", name);
+ return null;
+ } else if (res != null) {
+ return res;
+ }
+
+ // walk the repository list and try to find the resource
+ for (int i = 0; i < repository.length; i++) {
+ final ClassPathEntry cp = repository[i];
+ log.debug("Checking {}", cp);
+
+ res = cp.getResource(name);
+ if (res != null) {
+ log.debug("Found resource in {}, created ", res, new Date(
+ res.getLastModificationTime()));
+ cache.put(name, res);
+ return res;
+ }
+
+ }
+
+ log.debug("No classpath entry contains {}", name);
+ cache.put(name, NOT_FOUND_RESOURCE);
+ return null;
+ }
+
+ /**
+ * Defines a class getting the bytes for the class from the resource
+ *
+ * @param name The fully qualified class name
+ * @param res The resource to obtain the class bytes from
+ *
+ * @throws RepositoryException If a problem occurrs getting at the data.
+ * @throws IOException If a problem occurrs reading the class bytes from
+ * the resource.
+ * @throws ClassFormatError If the class bytes read from the resource are
+ * not a valid class.
+ */
+ private Class defineClass(String name, ClassLoaderResource res)
+ throws IOException, RepositoryException {
+
+ log.debug("defineClass({}, {})", name, res);
+
+ Class clazz = res.getLoadedClass();
+ if (clazz == null) {
+
+ /**
+ * This following code for packages is duplicate from URLClassLoader
+ * because it is private there. I would like to not be forced to
+ * do this, but I still have to find a way ... -fmeschbe
+ */
+
+ // package support
+ int i = name.lastIndexOf('.');
+ if (i != -1) {
+ String pkgname = name.substring(0, i);
+ // Check if package already loaded.
+ Package pkg = getPackage(pkgname);
+ URL url = res.getCodeSourceURL();
+ Manifest man = res.getManifest();
+ if (pkg != null) {
+ // Package found, so check package sealing.
+ boolean ok;
+ if (pkg.isSealed()) {
+ // Verify that code source URL is the same.
+ ok = pkg.isSealed(url);
+ } else {
+ // Make sure we are not attempting to seal the package
+ // at this code source URL.
+ ok = (man == null) || !isSealed(pkgname, man);
+ }
+ if (!ok) {
+ throw new SecurityException("sealing violation");
+ }
+ } else {
+ if (man != null) {
+ definePackage(pkgname, man, url);
+ } else {
+ definePackage(pkgname, null, null, null, null, null, null, null);
+ }
+ }
+ }
+
+ byte[] data = res.getBytes();
+ clazz = defineClass(name, data, 0, data.length);
+ res.setLoadedClass(clazz);
+ }
+
+ return clazz;
+ }
+
+ /**
+ * Returns true if the specified package name is sealed according to the
+ * given manifest
+ * <p>
+ * This code is duplicate from <code>URLClassLoader.isSealed</code> because
+ * the latter has private access and we need the method here.
+ */
+ private boolean isSealed(String name, Manifest man) {
+ String path = name.replace('.', '/').concat("/");
+ Attributes attr = man.getAttributes(path);
+ String sealed = null;
+ if (attr != null) {
+ sealed = attr.getValue(Attributes.Name.SEALED);
+ }
+ if (sealed == null) {
+ if ((attr = man.getMainAttributes()) != null) {
+ sealed = attr.getValue(Attributes.Name.SEALED);
+ }
+ }
+ return "true".equalsIgnoreCase(sealed);
+ }
+
+ /**
+ * Returns <code>true</code> if the <code>url</code> is a <code>JCR</code>
+ * URL.
+ *
+ * @param url The URL to check whether it is a valid <code>JCR</code> URL.
+ *
+ * @return <code>true</code> if <code>url</code> is a valid <code>JCR</code>
+ * URL.
+ *
+ * @throws NullPointerException if <code>url</code> is <code>null</code>.
+ */
+ private boolean checkURL(URL url) {
+ return URLFactory.REPOSITORY_SCHEME.equalsIgnoreCase(url.getProtocol());
+ }
+}
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