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From f...@apache.org
Subject 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
Date Mon, 11 Jan 2016 09:36:00 GMT
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;
+    }
+}



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