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 * 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
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 *   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.
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 * This software consists of voluntary contributions made by many
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package org.apache.http.impl.conn;

import java.io.Closeable;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.Date;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.HttpClientConnection;
import org.apache.http.HttpHost;
import org.apache.http.annotation.GuardedBy;
import org.apache.http.annotation.ThreadSafe;
import org.apache.http.config.ConnectionConfig;
import org.apache.http.config.Lookup;
import org.apache.http.config.Registry;
import org.apache.http.config.RegistryBuilder;
import org.apache.http.config.SocketConfig;
import org.apache.http.conn.ConnectionRequest;
import org.apache.http.conn.DnsResolver;
import org.apache.http.conn.HttpClientConnectionManager;
import org.apache.http.conn.HttpClientConnectionOperator;
import org.apache.http.conn.HttpConnectionFactory;
import org.apache.http.conn.SchemePortResolver;
import org.apache.http.conn.ManagedHttpClientConnection;
import org.apache.http.conn.routing.HttpRoute;
import org.apache.http.conn.socket.ConnectionSocketFactory;
import org.apache.http.conn.socket.PlainConnectionSocketFactory;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.Args;
import org.apache.http.util.Asserts;
import org.apache.http.util.LangUtils;

/**
 * A connection manager for a single connection. This connection manager maintains only one active
 * connection. Even though this class is fully thread-safe it ought to be used by one execution
 * thread only, as only one thread a time can lease the connection at a time.
 * 

* This connection manager will make an effort to reuse the connection for subsequent requests * with the same {@link HttpRoute route}. It will, however, close the existing connection and * open it for the given route, if the route of the persistent connection does not match that * of the connection request. If the connection has been already been allocated * {@link IllegalStateException} is thrown. *

*

* This connection manager implementation should be used inside an EJB container instead of * {@link PoolingHttpClientConnectionManager}. *

* * @since 4.3 */ @ThreadSafe public class BasicHttpClientConnectionManager implements HttpClientConnectionManager, Closeable { private final Log log = LogFactory.getLog(getClass()); private final HttpClientConnectionOperator connectionOperator; private final HttpConnectionFactory connFactory; @GuardedBy("this") private ManagedHttpClientConnection conn; @GuardedBy("this") private HttpRoute route; @GuardedBy("this") private Object state; @GuardedBy("this") private long updated; @GuardedBy("this") private long expiry; @GuardedBy("this") private boolean leased; @GuardedBy("this") private SocketConfig socketConfig; @GuardedBy("this") private ConnectionConfig connConfig; private final AtomicBoolean isShutdown; private static Registry getDefaultRegistry() { return RegistryBuilder.create() .register("http", PlainConnectionSocketFactory.getSocketFactory()) .register("https", SSLConnectionSocketFactory.getSocketFactory()) .build(); } public BasicHttpClientConnectionManager( final Lookup socketFactoryRegistry, final HttpConnectionFactory connFactory, final SchemePortResolver schemePortResolver, final DnsResolver dnsResolver) { this( new DefaultHttpClientConnectionOperator(socketFactoryRegistry, schemePortResolver, dnsResolver), connFactory ); } /** * @since 4.4 */ public BasicHttpClientConnectionManager( final HttpClientConnectionOperator httpClientConnectionOperator, final HttpConnectionFactory connFactory) { super(); this.connectionOperator = Args.notNull(httpClientConnectionOperator, "Connection operator"); this.connFactory = connFactory != null ? connFactory : ManagedHttpClientConnectionFactory.INSTANCE; this.expiry = Long.MAX_VALUE; this.socketConfig = SocketConfig.DEFAULT; this.connConfig = ConnectionConfig.DEFAULT; this.isShutdown = new AtomicBoolean(false); } public BasicHttpClientConnectionManager( final Lookup socketFactoryRegistry, final HttpConnectionFactory connFactory) { this(socketFactoryRegistry, connFactory, null, null); } public BasicHttpClientConnectionManager( final Lookup socketFactoryRegistry) { this(socketFactoryRegistry, null, null, null); } public BasicHttpClientConnectionManager() { this(getDefaultRegistry(), null, null, null); } @Override protected void finalize() throws Throwable { try { shutdown(); } finally { // Make sure we call overridden method even if shutdown barfs super.finalize(); } } @Override public void close() { shutdown(); } HttpRoute getRoute() { return route; } Object getState() { return state; } public synchronized SocketConfig getSocketConfig() { return socketConfig; } public synchronized void setSocketConfig(final SocketConfig socketConfig) { this.socketConfig = socketConfig != null ? socketConfig : SocketConfig.DEFAULT; } public synchronized ConnectionConfig getConnectionConfig() { return connConfig; } public synchronized void setConnectionConfig(final ConnectionConfig connConfig) { this.connConfig = connConfig != null ? connConfig : ConnectionConfig.DEFAULT; } @Override public final ConnectionRequest requestConnection( final HttpRoute route, final Object state) { Args.notNull(route, "Route"); return new ConnectionRequest() { @Override public boolean cancel() { // Nothing to abort, since requests are immediate. return false; } @Override public HttpClientConnection get(final long timeout, final TimeUnit tunit) { return BasicHttpClientConnectionManager.this.getConnection( route, state); } }; } private void closeConnection() { if (this.conn != null) { this.log.debug("Closing connection"); try { this.conn.close(); } catch (final IOException iox) { if (this.log.isDebugEnabled()) { this.log.debug("I/O exception closing connection", iox); } } this.conn = null; } } private void shutdownConnection() { if (this.conn != null) { this.log.debug("Shutting down connection"); try { this.conn.shutdown(); } catch (final IOException iox) { if (this.log.isDebugEnabled()) { this.log.debug("I/O exception shutting down connection", iox); } } this.conn = null; } } private void checkExpiry() { if (this.conn != null && System.currentTimeMillis() >= this.expiry) { if (this.log.isDebugEnabled()) { this.log.debug("Connection expired @ " + new Date(this.expiry)); } closeConnection(); } } synchronized HttpClientConnection getConnection(final HttpRoute route, final Object state) { Asserts.check(!this.isShutdown.get(), "Connection manager has been shut down"); if (this.log.isDebugEnabled()) { this.log.debug("Get connection for route " + route); } Asserts.check(!this.leased, "Connection is still allocated"); if (!LangUtils.equals(this.route, route) || !LangUtils.equals(this.state, state)) { closeConnection(); } this.route = route; this.state = state; checkExpiry(); if (this.conn == null) { this.conn = this.connFactory.create(route, this.connConfig); } this.leased = true; return this.conn; } @Override public synchronized void releaseConnection( final HttpClientConnection conn, final Object state, final long keepalive, final TimeUnit tunit) { Args.notNull(conn, "Connection"); Asserts.check(conn == this.conn, "Connection not obtained from this manager"); if (this.log.isDebugEnabled()) { this.log.debug("Releasing connection " + conn); } if (this.isShutdown.get()) { return; } try { this.updated = System.currentTimeMillis(); if (!this.conn.isOpen()) { this.conn = null; this.route = null; this.conn = null; this.expiry = Long.MAX_VALUE; } else { this.state = state; if (this.log.isDebugEnabled()) { final String s; if (keepalive > 0) { s = "for " + keepalive + " " + tunit; } else { s = "indefinitely"; } this.log.debug("Connection can be kept alive " + s); } if (keepalive > 0) { this.expiry = this.updated + tunit.toMillis(keepalive); } else { this.expiry = Long.MAX_VALUE; } } } finally { this.leased = false; } } @Override public void connect( final HttpClientConnection conn, final HttpRoute route, final int connectTimeout, final HttpContext context) throws IOException { Args.notNull(conn, "Connection"); Args.notNull(route, "HTTP route"); Asserts.check(conn == this.conn, "Connection not obtained from this manager"); final HttpHost host; if (route.getProxyHost() != null) { host = route.getProxyHost(); } else { host = route.getTargetHost(); } final InetSocketAddress localAddress = route.getLocalSocketAddress(); this.connectionOperator.connect(this.conn, host, localAddress, connectTimeout, this.socketConfig, context); } @Override public void upgrade( final HttpClientConnection conn, final HttpRoute route, final HttpContext context) throws IOException { Args.notNull(conn, "Connection"); Args.notNull(route, "HTTP route"); Asserts.check(conn == this.conn, "Connection not obtained from this manager"); this.connectionOperator.upgrade(this.conn, route.getTargetHost(), context); } @Override public void routeComplete( final HttpClientConnection conn, final HttpRoute route, final HttpContext context) throws IOException { } @Override public synchronized void closeExpiredConnections() { if (this.isShutdown.get()) { return; } if (!this.leased) { checkExpiry(); } } @Override public synchronized void closeIdleConnections(final long idletime, final TimeUnit tunit) { Args.notNull(tunit, "Time unit"); if (this.isShutdown.get()) { return; } if (!this.leased) { long time = tunit.toMillis(idletime); if (time < 0) { time = 0; } final long deadline = System.currentTimeMillis() - time; if (this.updated <= deadline) { closeConnection(); } } } @Override public synchronized void shutdown() { if (this.isShutdown.compareAndSet(false, true)) { shutdownConnection(); } } }




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