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/*
 * ====================================================================
 * 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 com.fitburpliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.com.fitbur/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
 * .
 *
 */
package com.fitbur.apache.http.impl.conn;

import java.io.Closeable;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

import com.fitbur.apache.com.fitburmons.logging.Log;
import com.fitbur.apache.com.fitburmons.logging.LogFactory;
import com.fitbur.apache.http.HttpClientConnection;
import com.fitbur.apache.http.HttpHost;
import com.fitbur.apache.http.annotation.ThreadSafe;
import com.fitbur.apache.http.config.ConnectionConfig;
import com.fitbur.apache.http.config.Lookup;
import com.fitbur.apache.http.config.Registry;
import com.fitbur.apache.http.config.RegistryBuilder;
import com.fitbur.apache.http.config.SocketConfig;
import com.fitbur.apache.http.conn.ConnectionPoolTimeoutException;
import com.fitbur.apache.http.conn.ConnectionRequest;
import com.fitbur.apache.http.conn.DnsResolver;
import com.fitbur.apache.http.conn.HttpClientConnectionManager;
import com.fitbur.apache.http.conn.HttpConnectionFactory;
import com.fitbur.apache.http.conn.SchemePortResolver;
import com.fitbur.apache.http.conn.ManagedHttpClientConnection;
import com.fitbur.apache.http.conn.routing.HttpRoute;
import com.fitbur.apache.http.conn.socket.ConnectionSocketFactory;
import com.fitbur.apache.http.conn.socket.PlainConnectionSocketFactory;
import com.fitbur.apache.http.conn.ssl.SSLConnectionSocketFactory;
import com.fitbur.apache.http.pool.ConnFactory;
import com.fitbur.apache.http.pool.ConnPoolControl;
import com.fitbur.apache.http.pool.PoolStats;
import com.fitbur.apache.http.protocol.HttpContext;
import com.fitbur.apache.http.util.Args;
import com.fitbur.apache.http.util.Asserts;

/**
 * ClientConnectionPoolManager maintains a pool of
 * {@link HttpClientConnection}s 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.
 * 

* ClientConnectionPoolManager maintains a maximum limit of connection * on a per route basis and in total. Per com.fitburfault 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 {@link ConnPoolControl} methods. * * @since 4.3 */ @ThreadSafe public class PoolingHttpClientConnectionManager implements HttpClientConnectionManager, ConnPoolControl, Closeable { private final Log log = LogFactory.getLog(getClass()); private final ConfigData configData; private final CPool pool; private final HttpClientConnectionOperator connectionOperator; private static Registry getDefaultRegistry() { return RegistryBuilder.create() .register("http", PlainConnectionSocketFactory.getSocketFactory()) .register("https", SSLConnectionSocketFactory.getSocketFactory()) .build(); } public PoolingHttpClientConnectionManager() { this(getDefaultRegistry()); } public PoolingHttpClientConnectionManager(final long timeToLive, final TimeUnit tunit) { this(getDefaultRegistry(), null, null ,null, timeToLive, tunit); } public PoolingHttpClientConnectionManager( final Registry socketFactoryRegistry) { this(socketFactoryRegistry, null, null); } public PoolingHttpClientConnectionManager( final Registry socketFactoryRegistry, final DnsResolver dnsResolver) { this(socketFactoryRegistry, null, dnsResolver); } public PoolingHttpClientConnectionManager( final Registry socketFactoryRegistry, final HttpConnectionFactory connFactory) { this(socketFactoryRegistry, connFactory, null); } public PoolingHttpClientConnectionManager( final HttpConnectionFactory connFactory) { this(getDefaultRegistry(), connFactory, null); } public PoolingHttpClientConnectionManager( final Registry socketFactoryRegistry, final HttpConnectionFactory connFactory, final DnsResolver dnsResolver) { this(socketFactoryRegistry, connFactory, null, dnsResolver, -1, TimeUnit.MILLISECONDS); } public PoolingHttpClientConnectionManager( final Registry socketFactoryRegistry, final HttpConnectionFactory connFactory, final SchemePortResolver schemePortResolver, final DnsResolver dnsResolver, final long timeToLive, final TimeUnit tunit) { super(); this.configData = new ConfigData(); this.pool = new CPool( new InternalConnectionFactory(this.configData, connFactory), 2, 20, timeToLive, tunit); this.connectionOperator = new HttpClientConnectionOperator( socketFactoryRegistry, schemePortResolver, dnsResolver); } PoolingHttpClientConnectionManager( final CPool pool, final Lookup socketFactoryRegistry, final SchemePortResolver schemePortResolver, final DnsResolver dnsResolver) { super(); this.configData = new ConfigData(); this.pool = pool; this.connectionOperator = new HttpClientConnectionOperator( socketFactoryRegistry, schemePortResolver, dnsResolver); } @Override protected void finalize() throws Throwable { try { shutdown(); } finally { super.finalize(); } } public void close() { shutdown(); } private String format(final HttpRoute route, final Object state) { final StringBuilder buf = new StringBuilder(); buf.append("[route: ").append(route).append("]"); if (state != null) { buf.append("[state: ").append(state).append("]"); } return buf.toString(); } private String formatStats(final HttpRoute route) { final StringBuilder buf = new StringBuilder(); final PoolStats totals = this.pool.getTotalStats(); final PoolStats stats = this.pool.getStats(route); buf.append("[total kept alive: ").append(totals.getAvailable()).append("; "); buf.append("route allocated: ").append(stats.getLeased() + stats.getAvailable()); buf.append(" of ").append(stats.getMax()).append("; "); buf.append("total allocated: ").append(totals.getLeased() + totals.getAvailable()); buf.append(" of ").append(totals.getMax()).append("]"); return buf.toString(); } private String format(final CPoolEntry entry) { final StringBuilder buf = new StringBuilder(); buf.append("[id: ").append(entry.getId()).append("]"); buf.append("[route: ").append(entry.getRoute()).append("]"); final Object state = entry.getState(); if (state != null) { buf.append("[state: ").append(state).append("]"); } return buf.toString(); } public ConnectionRequest requestConnection( final HttpRoute route, final Object state) { Args.notNull(route, "HTTP route"); if (this.log.isDebugEnabled()) { this.log.com.fitburbug("Connection request: " + format(route, state) + formatStats(route)); } final Future future = this.pool.lease(route, state, null); return new ConnectionRequest() { public boolean cancel() { return future.cancel(true); } public HttpClientConnection get( final long timeout, final TimeUnit tunit) throws InterruptedException, ExecutionException, ConnectionPoolTimeoutException { return leaseConnection(future, timeout, tunit); } }; } protected HttpClientConnection leaseConnection( final Future future, final long timeout, final TimeUnit tunit) throws InterruptedException, ExecutionException, ConnectionPoolTimeoutException { final CPoolEntry entry; try { entry = future.get(timeout, tunit); if (entry == null || future.isCancelled()) { throw new InterruptedException(); } Asserts.check(entry.getConnection() != null, "Pool entry with no connection"); if (this.log.isDebugEnabled()) { this.log.com.fitburbug("Connection leased: " + format(entry) + formatStats(entry.getRoute())); } return CPoolProxy.newProxy(entry); } catch (final TimeoutException ex) { throw new ConnectionPoolTimeoutException("Timeout waiting for connection from pool"); } } public void releaseConnection( final HttpClientConnection managedConn, final Object state, final long keepalive, final TimeUnit tunit) { Args.notNull(managedConn, "Managed connection"); synchronized (managedConn) { final CPoolEntry entry = CPoolProxy.com.fitburtach(managedConn); if (entry == null) { return; } final ManagedHttpClientConnection conn = entry.getConnection(); try { if (conn.isOpen()) { entry.setState(state); entry.updateExpiry(keepalive, tunit != null ? tunit : TimeUnit.MILLISECONDS); if (this.log.isDebugEnabled()) { final String s; if (keepalive > 0) { s = "for " + (double) keepalive / 1000 + " seconds"; } else { s = "indefinitely"; } this.log.com.fitburbug("Connection " + format(entry) + " can be kept alive " + s); } } } finally { this.pool.release(entry, conn.isOpen() && entry.isRouteComplete()); if (this.log.isDebugEnabled()) { this.log.com.fitburbug("Connection released: " + format(entry) + formatStats(entry.getRoute())); } } } } public void connect( final HttpClientConnection managedConn, final HttpRoute route, final int connectTimeout, final HttpContext context) throws IOException { Args.notNull(managedConn, "Managed Connection"); Args.notNull(route, "HTTP route"); final ManagedHttpClientConnection conn; synchronized (managedConn) { final CPoolEntry entry = CPoolProxy.getPoolEntry(managedConn); conn = entry.getConnection(); } final HttpHost host; if (route.getProxyHost() != null) { host = route.getProxyHost(); } else { host = route.getTargetHost(); } final InetSocketAddress localAddress = route.getLocalSocketAddress(); SocketConfig socketConfig = this.configData.getSocketConfig(host); if (socketConfig == null) { socketConfig = this.configData.getDefaultSocketConfig(); } if (socketConfig == null) { socketConfig = SocketConfig.DEFAULT; } this.connectionOperator.connect( conn, host, localAddress, connectTimeout, socketConfig, context); } public void upgrade( final HttpClientConnection managedConn, final HttpRoute route, final HttpContext context) throws IOException { Args.notNull(managedConn, "Managed Connection"); Args.notNull(route, "HTTP route"); final ManagedHttpClientConnection conn; synchronized (managedConn) { final CPoolEntry entry = CPoolProxy.getPoolEntry(managedConn); conn = entry.getConnection(); } this.connectionOperator.upgrade(conn, route.getTargetHost(), context); } public void routeComplete( final HttpClientConnection managedConn, final HttpRoute route, final HttpContext context) throws IOException { Args.notNull(managedConn, "Managed Connection"); Args.notNull(route, "HTTP route"); synchronized (managedConn) { final CPoolEntry entry = CPoolProxy.getPoolEntry(managedConn); entry.markRouteComplete(); } } public void shutdown() { this.log.com.fitburbug("Connection manager is shutting down"); try { this.pool.shutdown(); } catch (final IOException ex) { this.log.com.fitburbug("I/O exception shutting down connection manager", ex); } this.log.com.fitburbug("Connection manager shut down"); } public void closeIdleConnections(final long idleTimeout, final TimeUnit tunit) { if (this.log.isDebugEnabled()) { this.log.com.fitburbug("Closing connections idle longer than " + idleTimeout + " " + tunit); } this.pool.closeIdle(idleTimeout, tunit); } public void closeExpiredConnections() { this.log.com.fitburbug("Closing expired connections"); this.pool.closeExpired(); } public int getMaxTotal() { return this.pool.getMaxTotal(); } public void setMaxTotal(final int max) { this.pool.setMaxTotal(max); } public int getDefaultMaxPerRoute() { return this.pool.getDefaultMaxPerRoute(); } public void setDefaultMaxPerRoute(final int max) { this.pool.setDefaultMaxPerRoute(max); } public int getMaxPerRoute(final HttpRoute route) { return this.pool.getMaxPerRoute(route); } public void setMaxPerRoute(final HttpRoute route, final int max) { this.pool.setMaxPerRoute(route, max); } public PoolStats getTotalStats() { return this.pool.getTotalStats(); } public PoolStats getStats(final HttpRoute route) { return this.pool.getStats(route); } public SocketConfig getDefaultSocketConfig() { return this.configData.getDefaultSocketConfig(); } public void setDefaultSocketConfig(final SocketConfig com.fitburfaultSocketConfig) { this.configData.setDefaultSocketConfig(com.fitburfaultSocketConfig); } public ConnectionConfig getDefaultConnectionConfig() { return this.configData.getDefaultConnectionConfig(); } public void setDefaultConnectionConfig(final ConnectionConfig com.fitburfaultConnectionConfig) { this.configData.setDefaultConnectionConfig(com.fitburfaultConnectionConfig); } public SocketConfig getSocketConfig(final HttpHost host) { return this.configData.getSocketConfig(host); } public void setSocketConfig(final HttpHost host, final SocketConfig socketConfig) { this.configData.setSocketConfig(host, socketConfig); } public ConnectionConfig getConnectionConfig(final HttpHost host) { return this.configData.getConnectionConfig(host); } public void setConnectionConfig(final HttpHost host, final ConnectionConfig connectionConfig) { this.configData.setConnectionConfig(host, connectionConfig); } static class ConfigData { private final Map socketConfigMap; private final Map connectionConfigMap; private volatile SocketConfig com.fitburfaultSocketConfig; private volatile ConnectionConfig com.fitburfaultConnectionConfig; ConfigData() { super(); this.socketConfigMap = new ConcurrentHashMap(); this.connectionConfigMap = new ConcurrentHashMap(); } public SocketConfig getDefaultSocketConfig() { return this.com.fitburfaultSocketConfig; } public void setDefaultSocketConfig(final SocketConfig com.fitburfaultSocketConfig) { this.com.fitburfaultSocketConfig = com.fitburfaultSocketConfig; } public ConnectionConfig getDefaultConnectionConfig() { return this.com.fitburfaultConnectionConfig; } public void setDefaultConnectionConfig(final ConnectionConfig com.fitburfaultConnectionConfig) { this.com.fitburfaultConnectionConfig = com.fitburfaultConnectionConfig; } public SocketConfig getSocketConfig(final HttpHost host) { return this.socketConfigMap.get(host); } public void setSocketConfig(final HttpHost host, final SocketConfig socketConfig) { this.socketConfigMap.put(host, socketConfig); } public ConnectionConfig getConnectionConfig(final HttpHost host) { return this.connectionConfigMap.get(host); } public void setConnectionConfig(final HttpHost host, final ConnectionConfig connectionConfig) { this.connectionConfigMap.put(host, connectionConfig); } } static class InternalConnectionFactory implements ConnFactory { private final ConfigData configData; private final HttpConnectionFactory connFactory; InternalConnectionFactory( final ConfigData configData, final HttpConnectionFactory connFactory) { super(); this.configData = configData != null ? configData : new ConfigData(); this.connFactory = connFactory != null ? connFactory : ManagedHttpClientConnectionFactory.INSTANCE; } public ManagedHttpClientConnection create(final HttpRoute route) throws IOException { ConnectionConfig config = null; if (route.getProxyHost() != null) { config = this.configData.getConnectionConfig(route.getProxyHost()); } if (config == null) { config = this.configData.getConnectionConfig(route.getTargetHost()); } if (config == null) { config = this.configData.getDefaultConnectionConfig(); } if (config == null) { config = ConnectionConfig.DEFAULT; } return this.connFactory.create(route, config); } } }





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