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Java example source code file (ThreadSafeClientConnManager.java)
The ThreadSafeClientConnManager.java example source code/* * ==================================================================== * * 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. * ==================================================================== * * This software consists of voluntary contributions made by many * individuals on behalf of the Apache Software Foundation. For more * information on the Apache Software Foundation, please see * <http://www.apache.org/>. * */ package org.apache.http.impl.conn.tsccm; import java.io.IOException; import java.util.concurrent.TimeUnit; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.http.conn.routing.HttpRoute; import org.apache.http.conn.scheme.SchemeRegistry; import org.apache.http.conn.ClientConnectionManager; import org.apache.http.conn.ClientConnectionOperator; import org.apache.http.conn.ClientConnectionRequest; import org.apache.http.conn.ConnectionPoolTimeoutException; import org.apache.http.conn.ManagedClientConnection; import org.apache.http.conn.OperatedClientConnection; import org.apache.http.params.HttpParams; import org.apache.http.impl.conn.DefaultClientConnectionOperator; /** * Manages a pool of {@link OperatedClientConnection client connections} and * is able to service connection requests from multiple execution threads. * Connections are pooled on a per route basis. A request for a route which * already the manager has persistent connections for available in the pool * will be services by leasing a connection from the pool rather than * creating a brand new connection. * <p> * ThreadSafeClientConnManager maintains a maximum limit of connection on * a per route basis and in total. Per default this implementation will * create no more than than 2 concurrent connections per given route * and no more 20 connections in total. For many real-world applications * these limits may prove too constraining, especially if they use HTTP * as a transport protocol for their services. Connection limits, however, * can be adjusted using HTTP parameters. * <p> * The following parameters can be used to customize the behavior of this * class: * <ul> * <li>{@link org.apache.http.conn.params.ConnManagerPNames#MAX_TOTAL_CONNECTIONS} * <li>{@link org.apache.http.conn.params.ConnManagerPNames#MAX_CONNECTIONS_PER_ROUTE} * </ul> * * @see org.apache.http.conn.params.ConnPerRoute * @see org.apache.http.conn.params.ConnPerRouteBean * * @since 4.0 */ public class ThreadSafeClientConnManager implements ClientConnectionManager { private final Log log = LogFactory.getLog(getClass()); /** The schemes supported by this connection manager. */ protected final SchemeRegistry schemeRegistry; // @ThreadSafe /** The pool of connections being managed. */ protected final AbstractConnPool connectionPool; /** The operator for opening and updating connections. */ protected final ClientConnectionOperator connOperator; // DefaultClientConnectionOperator is @ThreadSafe /** * Creates a new thread safe connection manager. * * @param params the parameters for this manager. * @param schreg the scheme registry. */ public ThreadSafeClientConnManager(HttpParams params, SchemeRegistry schreg) { if (params == null) { throw new IllegalArgumentException("HTTP parameters may not be null"); } if (schreg == null) { throw new IllegalArgumentException("Scheme registry may not be null"); } this.schemeRegistry = schreg; this.connOperator = createConnectionOperator(schreg); this.connectionPool = createConnectionPool(params); } @Override protected void finalize() throws Throwable { try { shutdown(); } finally { super.finalize(); } } /** * Hook for creating the connection pool. * * @return the connection pool to use */ protected AbstractConnPool createConnectionPool(final HttpParams params) { return new ConnPoolByRoute(connOperator, params); } /** * Hook for creating the connection operator. * It is called by the constructor. * Derived classes can override this method to change the * instantiation of the operator. * The default implementation here instantiates * {@link DefaultClientConnectionOperator DefaultClientConnectionOperator}. * * @param schreg the scheme registry. * * @return the connection operator to use */ protected ClientConnectionOperator createConnectionOperator(SchemeRegistry schreg) { return new DefaultClientConnectionOperator(schreg);// @ThreadSafe } public SchemeRegistry getSchemeRegistry() { return this.schemeRegistry; } public ClientConnectionRequest requestConnection( final HttpRoute route, final Object state) { final PoolEntryRequest poolRequest = connectionPool.requestPoolEntry( route, state); return new ClientConnectionRequest() { public void abortRequest() { poolRequest.abortRequest(); } public ManagedClientConnection getConnection( long timeout, TimeUnit tunit) throws InterruptedException, ConnectionPoolTimeoutException { if (route == null) { throw new IllegalArgumentException("Route may not be null."); } if (log.isDebugEnabled()) { log.debug("Get connection: " + route + ", timeout = " + timeout); } BasicPoolEntry entry = poolRequest.getPoolEntry(timeout, tunit); return new BasicPooledConnAdapter(ThreadSafeClientConnManager.this, entry); } }; } public void releaseConnection(ManagedClientConnection conn, long validDuration, TimeUnit timeUnit) { if (!(conn instanceof BasicPooledConnAdapter)) { throw new IllegalArgumentException ("Connection class mismatch, " + "connection not obtained from this manager."); } BasicPooledConnAdapter hca = (BasicPooledConnAdapter) conn; if ((hca.getPoolEntry() != null) && (hca.getManager() != this)) { throw new IllegalArgumentException ("Connection not obtained from this manager."); } synchronized (hca) { BasicPoolEntry entry = (BasicPoolEntry) hca.getPoolEntry(); if (entry == null) { return; } try { // make sure that the response has been read completely if (hca.isOpen() && !hca.isMarkedReusable()) { // In MTHCM, there would be a call to // SimpleHttpConnectionManager.finishLastResponse(conn); // Consuming the response is handled outside in 4.0. // make sure this connection will not be re-used // Shut down rather than close, we might have gotten here // because of a shutdown trigger. // Shutdown of the adapter also clears the tracked route. hca.shutdown(); } } catch (IOException iox) { if (log.isDebugEnabled()) log.debug("Exception shutting down released connection.", iox); } finally { boolean reusable = hca.isMarkedReusable(); if (log.isDebugEnabled()) { if (reusable) { log.debug("Released connection is reusable."); } else { log.debug("Released connection is not reusable."); } } hca.detach(); connectionPool.freeEntry(entry, reusable, validDuration, timeUnit); } } } public void shutdown() { log.debug("Shutting down"); connectionPool.shutdown(); } /** * Gets the total number of pooled connections for the given route. * This is the total number of connections that have been created and * are still in use by this connection manager for the route. * This value will not exceed the maximum number of connections per host. * * @param route the route in question * * @return the total number of pooled connections for that route */ public int getConnectionsInPool(HttpRoute route) { return ((ConnPoolByRoute)connectionPool).getConnectionsInPool( route); } /** * Gets the total number of pooled connections. This is the total number of * connections that have been created and are still in use by this connection * manager. This value will not exceed the maximum number of connections * in total. * * @return the total number of pooled connections */ public int getConnectionsInPool() { connectionPool.poolLock.lock(); try { return connectionPool.numConnections; } finally { connectionPool.poolLock.unlock(); } } public void closeIdleConnections(long idleTimeout, TimeUnit tunit) { if (log.isDebugEnabled()) { log.debug("Closing connections idle for " + idleTimeout + " " + tunit); } connectionPool.poolLock.lock(); try { connectionPool.closeIdleConnections(idleTimeout, tunit); connectionPool.deleteClosedConnections(); } finally { connectionPool.poolLock.unlock(); } } public void closeExpiredConnections() { log.debug("Closing expired connections"); connectionPool.poolLock.lock(); try { connectionPool.closeExpiredConnections(); connectionPool.deleteClosedConnections(); } finally { connectionPool.poolLock.unlock(); } } } Other Java examples (source code examples)Here is a short list of links related to this Java ThreadSafeClientConnManager.java source code file: |
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