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Posted to dev@tomcat.apache.org by ma...@apache.org on 2016/02/18 10:45:39 UTC
svn commit: r1731030 - in /tomcat/tc8.0.x/trunk: ./
java/org/apache/catalina/loader/ResourceEntry.java
java/org/apache/catalina/loader/WebappClassLoaderBase.java
webapps/docs/changelog.xml
Author: markt
Date: Thu Feb 18 09:45:39 2016
New Revision: 1731030
URL: http://svn.apache.org/viewvc?rev=1731030&view=rev
Log:
Refactor class loading so JAR scanning does not trigger the caching of the byte[] for every scanned class until the class is loaded.
Modified:
tomcat/tc8.0.x/trunk/ (props changed)
tomcat/tc8.0.x/trunk/java/org/apache/catalina/loader/ResourceEntry.java
tomcat/tc8.0.x/trunk/java/org/apache/catalina/loader/WebappClassLoaderBase.java
tomcat/tc8.0.x/trunk/webapps/docs/changelog.xml
Propchange: tomcat/tc8.0.x/trunk/
------------------------------------------------------------------------------
--- svn:mergeinfo (original)
+++ svn:mergeinfo Thu Feb 18 09:45:39 2016
@@ -1 +1 @@
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39,1720445,1720448,1720462,1720506,1720652,1720654-1720655,1720711,1720752,1720769,1720776,1720804,1720815,1721303,1721307,1721311,1721314,1721447,1721528,1721539,1721812,1721817,1721830,1721860,1721866,1721881,1721887,1722205,1722292,1722399,1722453,1722455,1722522,1722526,1722532,1722548,1722574,1722583,1722585,1722799,1722807,1722824,1722828-1722829,1722831,1722859,1722902,1722905,1722923,1722939,1722945,1722996,1723068,1723127,1723155,1723250,1723316-1723318,1723368,1723371,1723375,1723377,1723380,1723410,1723414,1723437,1723484,1723486,1723493-1723494,1723500,1723552,1723554,1723683,1723707,1723736,1724012,1724252,1724325,1724427-1724428,1724433,1724673,1724788,1724863,1724900,1724997,1725113,1725126-1725127,1725150,1725165,1725183,1725199,1725202,1725204,1725207,1725263-1725264,1725266,1725278,1725282,1725405,1725599,1725601,1725635,1725646,1725649-1725652,1725694,1725696-1725697,1725816,1725851,1725906-1725907,1725910,1725914,1725920,1725926,1726177,1726202,1726628,1726632,17
26637,1726639,1726648,1726651,1726654,1726669,1726676,1726803,1726925-1726926,1726972-1726973,1726991,1727162,1727670,1727675,1727899,1727914,1727917,1728091,1728138,1728433,1728448,1729185,1729361,1729625,1729730,1730101-1730102,1730137,1730612,1730946,1731008
Modified: tomcat/tc8.0.x/trunk/java/org/apache/catalina/loader/ResourceEntry.java
URL: http://svn.apache.org/viewvc/tomcat/tc8.0.x/trunk/java/org/apache/catalina/loader/ResourceEntry.java?rev=1731030&r1=1731029&r2=1731030&view=diff
==============================================================================
--- tomcat/tc8.0.x/trunk/java/org/apache/catalina/loader/ResourceEntry.java (original)
+++ tomcat/tc8.0.x/trunk/java/org/apache/catalina/loader/ResourceEntry.java Thu Feb 18 09:45:39 2016
@@ -14,13 +14,11 @@
* See the License for the specific language governing permissions and
* limitations under the License.
*/
-
-
package org.apache.catalina.loader;
import java.net.URL;
-import java.security.cert.Certificate;
-import java.util.jar.Manifest;
+
+import org.apache.catalina.WebResource;
/**
* Resource entry.
@@ -55,23 +53,6 @@ public class ResourceEntry {
public URL source = null;
- /**
- * URL of the codebase from where the object was loaded.
- */
- public URL codeBase = null;
-
-
- /**
- * Manifest (if the resource was loaded from a JAR).
- */
- public Manifest manifest = null;
-
-
- /**
- * Certificates (if the resource was loaded from a JAR).
- */
- public Certificate[] certificates = null;
-
-
+ public WebResource webResource = null;
}
Modified: tomcat/tc8.0.x/trunk/java/org/apache/catalina/loader/WebappClassLoaderBase.java
URL: http://svn.apache.org/viewvc/tomcat/tc8.0.x/trunk/java/org/apache/catalina/loader/WebappClassLoaderBase.java?rev=1731030&r1=1731029&r2=1731030&view=diff
==============================================================================
--- tomcat/tc8.0.x/trunk/java/org/apache/catalina/loader/WebappClassLoaderBase.java (original)
+++ tomcat/tc8.0.x/trunk/java/org/apache/catalina/loader/WebappClassLoaderBase.java Thu Feb 18 09:45:39 2016
@@ -41,6 +41,7 @@ import java.security.PermissionCollectio
import java.security.Policy;
import java.security.PrivilegedAction;
import java.security.ProtectionDomain;
+import java.security.cert.Certificate;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
@@ -139,8 +140,6 @@ public abstract class WebappClassLoaderB
private static final String CLASS_FILE_SUFFIX = ".class";
private static final String SERVICES_PREFIX = "/META-INF/services/";
- private static final Manifest MANIFEST_UNKNOWN = new Manifest();
-
static {
ClassLoader.registerAsParallelCapable();
JVM_THREAD_GROUP_NAMES.add(JVM_THREAD_GROUP_SYSTEM);
@@ -152,19 +151,16 @@ public abstract class WebappClassLoaderB
protected final String name;
protected final String path;
- protected final boolean manifestRequired;
- PrivilegedFindResourceByName(String name, String path, boolean manifestRequired) {
+ PrivilegedFindResourceByName(String name, String path) {
this.name = name;
this.path = path;
- this.manifestRequired = manifestRequired;
}
@Override
public ResourceEntry run() {
- return findResourceInternal(name, path, manifestRequired);
+ return findResourceInternal(name, path);
}
-
}
@@ -908,14 +904,15 @@ public abstract class WebappClassLoaderB
if (entry == null) {
if (securityManager != null) {
PrivilegedAction<ResourceEntry> dp =
- new PrivilegedFindResourceByName(name, path, false);
+ new PrivilegedFindResourceByName(name, path);
entry = AccessController.doPrivileged(dp);
} else {
- entry = findResourceInternal(name, path, false);
+ entry = findResourceInternal(name, path);
}
}
if (entry != null) {
url = entry.source;
+ entry.webResource = null;
}
if ((url == null) && hasExternalRepositories) {
@@ -928,7 +925,7 @@ public abstract class WebappClassLoaderB
else
log.debug(" --> Resource not found, returning null");
}
- return (url);
+ return url;
}
@@ -2396,10 +2393,10 @@ public abstract class WebappClassLoaderB
if (securityManager != null) {
PrivilegedAction<ResourceEntry> dp =
- new PrivilegedFindResourceByName(name, path, true);
+ new PrivilegedFindResourceByName(name, path);
entry = AccessController.doPrivileged(dp);
} else {
- entry = findResourceInternal(name, path, true);
+ entry = findResourceInternal(name, path);
}
if (entry == null) {
@@ -2415,10 +2412,43 @@ public abstract class WebappClassLoaderB
if (clazz != null)
return clazz;
- if (entry.binaryContent == null) {
+ WebResource webResource = entry.webResource;
+ if (webResource == null) {
+ webResource = resources.getResource(path);
+ } else {
+ entry.webResource = null;
+ }
+
+ if (webResource == null) {
return null;
}
+ Manifest manifest = webResource.getManifest();
+ URL codeBase = webResource.getCodeBase();
+ Certificate[] certificates = webResource.getCertificates();
+ byte[] binaryContent = webResource.getContent();
+
+ if (transformers.size() > 0) {
+ // If the resource is a class just being loaded, decorate it
+ // with any attached transformers
+ String className = name.endsWith(CLASS_FILE_SUFFIX) ?
+ name.substring(0, name.length() - CLASS_FILE_SUFFIX.length()) : name;
+ String internalName = className.replace(".", "/");
+
+ for (ClassFileTransformer transformer : this.transformers) {
+ try {
+ byte[] transformed = transformer.transform(
+ this, internalName, null, null, binaryContent);
+ if (transformed != null) {
+ binaryContent = transformed;
+ }
+ } catch (IllegalClassFormatException e) {
+ log.error(sm.getString("webappClassLoader.transformError", name), e);
+ return null;
+ }
+ }
+ }
+
// Looking up the package
String packageName = null;
int pos = name.lastIndexOf('.');
@@ -2432,12 +2462,10 @@ public abstract class WebappClassLoaderB
// Define the package (if null)
if (pkg == null) {
try {
- if (entry.manifest == null) {
- definePackage(packageName, null, null, null, null,
- null, null, null);
+ if (manifest == null) {
+ definePackage(packageName, null, null, null, null, null, null, null);
} else {
- definePackage(packageName, entry.manifest,
- entry.codeBase);
+ definePackage(packageName, manifest, codeBase);
}
} catch (IllegalArgumentException e) {
// Ignore: normal error due to dual definition of package
@@ -2452,10 +2480,9 @@ public abstract class WebappClassLoaderB
if (pkg != null) {
boolean sealCheck = true;
if (pkg.isSealed()) {
- sealCheck = pkg.isSealed(entry.codeBase);
+ sealCheck = pkg.isSealed(codeBase);
} else {
- sealCheck = (entry.manifest == null)
- || !isPackageSealed(packageName, entry.manifest);
+ sealCheck = (manifest == null) || !isPackageSealed(packageName, manifest);
}
if (!sealCheck)
throw new SecurityException
@@ -2466,9 +2493,8 @@ public abstract class WebappClassLoaderB
}
try {
- clazz = defineClass(name, entry.binaryContent, 0,
- entry.binaryContent.length,
- new CodeSource(entry.codeBase, entry.certificates));
+ clazz = defineClass(name, binaryContent, 0,
+ binaryContent.length, new CodeSource(codeBase, certificates));
} catch (UnsupportedClassVersionError ucve) {
throw new UnsupportedClassVersionError(
ucve.getLocalizedMessage() + " " +
@@ -2478,10 +2504,6 @@ public abstract class WebappClassLoaderB
// Now the class has been defined, clear the elements of the local
// resource cache that are no longer required.
entry.loadedClass = clazz;
- entry.binaryContent = null;
- entry.codeBase = null;
- entry.manifest = null;
- entry.certificates = null;
// Retain entry.source in case of a getResourceAsStream() call on
// the class file after the class has been defined.
}
@@ -2517,10 +2539,12 @@ public abstract class WebappClassLoaderB
/**
* Find specified resource in local repositories.
*
+ * @param name the resource name
+ * @param path the resource path
+ *
* @return the loaded resource, or null if the resource isn't found
*/
- protected ResourceEntry findResourceInternal(final String name, final String path,
- boolean manifestRequired) {
+ protected ResourceEntry findResourceInternal(final String name, final String path) {
checkStateForResourceLoading(name);
@@ -2532,25 +2556,9 @@ public abstract class WebappClassLoaderB
ResourceEntry entry = resourceEntries.get(path);
if (entry != null) {
- if (manifestRequired && entry.manifest == MANIFEST_UNKNOWN) {
- // This resource was added to the cache when a request was made
- // for the resource that did not need the manifest. Now the
- // manifest is required, the cache entry needs to be updated.
- resource = resources.getClassLoaderResource(path);
- entry.manifest = resource.getManifest();
- }
return entry;
}
- boolean isClassResource = path.endsWith(CLASS_FILE_SUFFIX);
- boolean isCacheable = isClassResource;
- if (!isCacheable) {
- isCacheable = path.startsWith(SERVICES_PREFIX);
- }
-
-
- boolean fileNeedConvert = false;
-
resource = resources.getClassLoaderResource(path);
if (!resource.exists()) {
@@ -2559,29 +2567,27 @@ public abstract class WebappClassLoaderB
entry = new ResourceEntry();
entry.source = resource.getURL();
- entry.codeBase = resource.getCodeBase();
entry.lastModified = resource.getLastModified();
+ entry.webResource = resource;
+ boolean fileNeedConvert = false;
if (needConvert && path.endsWith(".properties")) {
fileNeedConvert = true;
}
/* Only cache the binary content if there is some content
* available one of the following is true:
- * a) It is a class file since the binary content is only cached
- * until the class has been loaded
- * or
- * b) The file needs conversion to address encoding issues (see
+ * a) The file needs conversion to address encoding issues (see
* below)
* or
- * c) The resource is a service provider configuration file located
+ * b) The resource is a service provider configuration file located
* under META=INF/services
*
* In all other cases do not cache the content to prevent
* excessive memory usage if large resources are present (see
* https://bz.apache.org/bugzilla/show_bug.cgi?id=53081).
*/
- if (isCacheable || fileNeedConvert) {
+ if (path.startsWith(SERVICES_PREFIX) || fileNeedConvert) {
byte[] binaryContent = resource.getContent();
if (binaryContent != null) {
if (fileNeedConvert) {
@@ -2597,38 +2603,6 @@ public abstract class WebappClassLoaderB
}
}
entry.binaryContent = binaryContent;
- // The certificates and manifest are made available as a side
- // effect of reading the binary content
- entry.certificates = resource.getCertificates();
- }
- }
-
- if (manifestRequired) {
- entry.manifest = resource.getManifest();
- } else {
- entry.manifest = MANIFEST_UNKNOWN;
- }
-
- if (isClassResource && entry.binaryContent != null &&
- this.transformers.size() > 0) {
- // If the resource is a class just being loaded, decorate it
- // with any attached transformers
- String className = name.endsWith(CLASS_FILE_SUFFIX) ?
- name.substring(0, name.length() - CLASS_FILE_SUFFIX.length()) : name;
- String internalName = className.replace(".", "/");
-
- for (ClassFileTransformer transformer : this.transformers) {
- try {
- byte[] transformed = transformer.transform(
- this, internalName, null, null, entry.binaryContent
- );
- if (transformed != null) {
- entry.binaryContent = transformed;
- }
- } catch (IllegalClassFormatException e) {
- log.error(sm.getString("webappClassLoader.transformError", name), e);
- return null;
- }
}
}
Modified: tomcat/tc8.0.x/trunk/webapps/docs/changelog.xml
URL: http://svn.apache.org/viewvc/tomcat/tc8.0.x/trunk/webapps/docs/changelog.xml?rev=1731030&r1=1731029&r2=1731030&view=diff
==============================================================================
--- tomcat/tc8.0.x/trunk/webapps/docs/changelog.xml (original)
+++ tomcat/tc8.0.x/trunk/webapps/docs/changelog.xml Thu Feb 18 09:45:39 2016
@@ -76,6 +76,10 @@
Fix the type of <code>InstanceManager</code> attribute of mbean
definition of <code>StandardContext</code>. (kfujino)
</fix>
+ <fix>
+ Refactor the web application class loader to reduce the impact of JAR
+ scanning on the memory footprint of the web application. (markt)
+ </fix>
</changelog>
</subsection>
<subsection name="Web applications">
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