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Posted to commits@chemistry.apache.org by fm...@apache.org on 2016/01/11 10:36:00 UTC
svn commit: r1723993 -
/chemistry/opencmis/trunk/chemistry-opencmis-client/chemistry-opencmis-client-bindings/src/main/java/org/apache/chemistry/opencmis/client/bindings/spi/http/DelayingHttpInvoker.java
Author: fmui
Date: Mon Jan 11 09:35:59 2016
New Revision: 1723993
URL: http://svn.apache.org/viewvc?rev=1723993&view=rev
Log:
CMIS-952: added DelayingHttpInvoker
Added:
chemistry/opencmis/trunk/chemistry-opencmis-client/chemistry-opencmis-client-bindings/src/main/java/org/apache/chemistry/opencmis/client/bindings/spi/http/DelayingHttpInvoker.java
Added: chemistry/opencmis/trunk/chemistry-opencmis-client/chemistry-opencmis-client-bindings/src/main/java/org/apache/chemistry/opencmis/client/bindings/spi/http/DelayingHttpInvoker.java
URL: http://svn.apache.org/viewvc/chemistry/opencmis/trunk/chemistry-opencmis-client/chemistry-opencmis-client-bindings/src/main/java/org/apache/chemistry/opencmis/client/bindings/spi/http/DelayingHttpInvoker.java?rev=1723993&view=auto
==============================================================================
--- chemistry/opencmis/trunk/chemistry-opencmis-client/chemistry-opencmis-client-bindings/src/main/java/org/apache/chemistry/opencmis/client/bindings/spi/http/DelayingHttpInvoker.java (added)
+++ chemistry/opencmis/trunk/chemistry-opencmis-client/chemistry-opencmis-client-bindings/src/main/java/org/apache/chemistry/opencmis/client/bindings/spi/http/DelayingHttpInvoker.java Mon Jan 11 09:35:59 2016
@@ -0,0 +1,162 @@
+/*
+ * 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.chemistry.opencmis.client.bindings.spi.http;
+
+import java.math.BigInteger;
+import java.util.Map;
+
+import org.apache.chemistry.opencmis.client.bindings.spi.BindingSession;
+import org.apache.chemistry.opencmis.commons.exceptions.CmisBaseException;
+import org.apache.chemistry.opencmis.commons.exceptions.CmisRuntimeException;
+import org.apache.chemistry.opencmis.commons.impl.ClassLoaderUtil;
+import org.apache.chemistry.opencmis.commons.impl.UrlBuilder;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * A HTTP Invoker that delays HTTP requests and thereby throttles the client.
+ *
+ * This HTTP Invoker is only a wrapper that delegates the work to another HTTP
+ * Invoker, which is defined with the session parameter
+ * {@link DELEGTAE_HTTP_INVOKER_CLASS}.
+ *
+ * The session parameter {@link DELAY_TIME} defines the delay in milliseconds.
+ */
+public class DelayingHttpInvoker implements HttpInvoker {
+
+ private static final Logger LOG = LoggerFactory.getLogger(DelayingHttpInvoker.class);
+
+ /**
+ * Session parameter: class name of the HTTP Invoker doing the the real
+ * work. (Optional. Default is the {@link DefaultHttpInvoker}.)
+ */
+ public static final String DELEGTAE_HTTP_INVOKER_CLASS = "org.apache.chemistry.opencmis.binding.httpinvoker.delay.delegate.classname";
+ /**
+ * Session parameter: Delay time in milliseconds. (Required.)
+ */
+ public static final String DELAY_TIME = "org.apache.chemistry.opencmis.binding.httpinvoker.delay.delaytime";
+
+ protected static final String DELEGTAE_HTTP_INVOKER = "org.apache.chemistry.opencmis.client.bindings.spi.http.limiter.httpInvoker";
+ protected static final String LAST_EXECUTION = "org.apache.chemistry.opencmis.client.bindings.spi.http.limiter.lastExecution";
+
+ public DelayingHttpInvoker() {
+ }
+
+ @Override
+ public Response invokeGET(UrlBuilder url, BindingSession session) {
+ delay(session);
+ return getHttpInvoker(session).invokeGET(url, session);
+ }
+
+ @Override
+ public Response invokeGET(UrlBuilder url, BindingSession session, BigInteger offset, BigInteger length) {
+ delay(session);
+ return getHttpInvoker(session).invokeGET(url, session, offset, length);
+ }
+
+ @Override
+ public Response invokePOST(UrlBuilder url, String contentType, Output writer, BindingSession session) {
+ delay(session);
+ return getHttpInvoker(session).invokePOST(url, contentType, writer, session);
+ }
+
+ @Override
+ public Response invokePUT(UrlBuilder url, String contentType, Map<String, String> headers, Output writer,
+ BindingSession session) {
+ delay(session);
+ return getHttpInvoker(session).invokePUT(url, contentType, headers, writer, session);
+ }
+
+ @Override
+ public Response invokeDELETE(UrlBuilder url, BindingSession session) {
+ delay(session);
+ return getHttpInvoker(session).invokeDELETE(url, session);
+ }
+
+ protected void delay(BindingSession session) {
+ session.writeLock();
+ try {
+ int delayTime = session.get(DELAY_TIME, -1);
+ if (delayTime < 0) {
+ if (LOG.isInfoEnabled()) {
+ LOG.info("No delay time configured.");
+ }
+ return;
+ }
+
+ Object lastExcution = session.get(LAST_EXECUTION);
+ if (lastExcution instanceof Long) {
+ long lastExcutionLong = (Long) lastExcution;
+ long now = System.currentTimeMillis();
+ if (now - lastExcutionLong < delayTime) {
+ try {
+ Thread.sleep(delayTime - (now - lastExcutionLong));
+ } catch (InterruptedException e) {
+ if (LOG.isDebugEnabled()) {
+ LOG.debug("Interrupted sleep", e);
+ }
+ }
+ }
+ }
+
+ session.put(LAST_EXECUTION, System.currentTimeMillis());
+
+ } finally {
+ session.writeUnlock();
+ }
+ }
+
+ protected HttpInvoker getHttpInvoker(BindingSession session) {
+ HttpInvoker invoker = (HttpInvoker) session.get(DELEGTAE_HTTP_INVOKER);
+
+ if (invoker != null) {
+ return invoker;
+ }
+
+ session.writeLock();
+ try {
+ // try again
+ invoker = (HttpInvoker) session.get(DELEGTAE_HTTP_INVOKER);
+ if (invoker != null) {
+ return invoker;
+ }
+
+ // ok, we have to create it...
+ try {
+ String invokerName = (String) session.get(DELEGTAE_HTTP_INVOKER_CLASS);
+ if (invokerName == null) {
+ invoker = new DefaultHttpInvoker();
+ } else {
+ invoker = (HttpInvoker) ClassLoaderUtil.loadClass(invokerName).newInstance();
+ }
+ } catch (CmisBaseException e) {
+ throw e;
+ } catch (Exception e) {
+ throw new CmisRuntimeException("Delegate HTTP invoker cannot be initialized: " + e.getMessage(), e);
+ }
+
+ // we have an Invoker object -> put it into the session
+ session.put(DELEGTAE_HTTP_INVOKER, invoker, true);
+ } finally {
+ session.writeUnlock();
+ }
+
+ return invoker;
+ }
+}