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/*
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 * Licensed to the Apache Software Foundation (ASF) under one
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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
 *
 *   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.IOException;
import java.io.InterruptedIOException;
import java.net.InetAddress;
import java.net.Socket;
import java.util.concurrent.TimeUnit;

import javax.net.ssl.SSLSession;
import javax.net.ssl.SSLSocket;

import org.apache.http.HttpConnectionMetrics;
import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.HttpException;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.ManagedClientConnection;
import org.apache.http.conn.OperatedClientConnection;
import org.apache.http.protocol.HttpContext;

/**
 * Abstract adapter from {@link OperatedClientConnection operated} to
 * {@link ManagedClientConnection managed} client connections.
 * Read and write methods are delegated to the wrapped connection.
 * Operations affecting the connection state have to be implemented
 * by derived classes. Operations for querying the connection state
 * are delegated to the wrapped connection if there is one, or
 * return a default value if there is none.
 * 

* This adapter tracks the checkpoints for reusable communication states, * as indicated by {@link #markReusable markReusable} and queried by * {@link #isMarkedReusable isMarkedReusable}. * All send and receive operations will automatically clear the mark. *

* Connection release calls are delegated to the connection manager, * if there is one. {@link #abortConnection abortConnection} will * clear the reusability mark first. The connection manager is * expected to tolerate multiple calls to the release method. * * @since 4.0 * * @deprecated (4.2) do not use */ @Deprecated public abstract class AbstractClientConnAdapter implements ManagedClientConnection, HttpContext { /** * The connection manager. */ private final ClientConnectionManager connManager; /** The wrapped connection. */ private volatile OperatedClientConnection wrappedConnection; /** The reusability marker. */ private volatile boolean markedReusable; /** True if the connection has been shut down or released. */ private volatile boolean released; /** The duration this is valid for while idle (in ms). */ private volatile long duration; /** * Creates a new connection adapter. * The adapter is initially not * {@link #isMarkedReusable marked} as reusable. * * @param mgr the connection manager, or {@code null} * @param conn the connection to wrap, or {@code null} */ protected AbstractClientConnAdapter(final ClientConnectionManager mgr, final OperatedClientConnection conn) { super(); connManager = mgr; wrappedConnection = conn; markedReusable = false; released = false; duration = Long.MAX_VALUE; } /** * Detaches this adapter from the wrapped connection. * This adapter becomes useless. */ protected synchronized void detach() { wrappedConnection = null; duration = Long.MAX_VALUE; } protected OperatedClientConnection getWrappedConnection() { return wrappedConnection; } protected ClientConnectionManager getManager() { return connManager; } /** * @deprecated (4.1) use {@link #assertValid(OperatedClientConnection)} */ @Deprecated protected final void assertNotAborted() throws InterruptedIOException { if (isReleased()) { throw new InterruptedIOException("Connection has been shut down"); } } /** * @since 4.1 * @return value of released flag */ protected boolean isReleased() { return released; } /** * Asserts that there is a valid wrapped connection to delegate to. * * @throws ConnectionShutdownException if there is no wrapped connection * or connection has been aborted */ protected final void assertValid( final OperatedClientConnection wrappedConn) throws ConnectionShutdownException { if (isReleased() || wrappedConn == null) { throw new ConnectionShutdownException(); } } @Override public boolean isOpen() { final OperatedClientConnection conn = getWrappedConnection(); if (conn == null) { return false; } return conn.isOpen(); } @Override public boolean isStale() { if (isReleased()) { return true; } final OperatedClientConnection conn = getWrappedConnection(); if (conn == null) { return true; } return conn.isStale(); } @Override public void setSocketTimeout(final int timeout) { final OperatedClientConnection conn = getWrappedConnection(); assertValid(conn); conn.setSocketTimeout(timeout); } @Override public int getSocketTimeout() { final OperatedClientConnection conn = getWrappedConnection(); assertValid(conn); return conn.getSocketTimeout(); } @Override public HttpConnectionMetrics getMetrics() { final OperatedClientConnection conn = getWrappedConnection(); assertValid(conn); return conn.getMetrics(); } @Override public void flush() throws IOException { final OperatedClientConnection conn = getWrappedConnection(); assertValid(conn); conn.flush(); } @Override public boolean isResponseAvailable(final int timeout) throws IOException { final OperatedClientConnection conn = getWrappedConnection(); assertValid(conn); return conn.isResponseAvailable(timeout); } @Override public void receiveResponseEntity(final HttpResponse response) throws HttpException, IOException { final OperatedClientConnection conn = getWrappedConnection(); assertValid(conn); unmarkReusable(); conn.receiveResponseEntity(response); } @Override public HttpResponse receiveResponseHeader() throws HttpException, IOException { final OperatedClientConnection conn = getWrappedConnection(); assertValid(conn); unmarkReusable(); return conn.receiveResponseHeader(); } @Override public void sendRequestEntity(final HttpEntityEnclosingRequest request) throws HttpException, IOException { final OperatedClientConnection conn = getWrappedConnection(); assertValid(conn); unmarkReusable(); conn.sendRequestEntity(request); } @Override public void sendRequestHeader(final HttpRequest request) throws HttpException, IOException { final OperatedClientConnection conn = getWrappedConnection(); assertValid(conn); unmarkReusable(); conn.sendRequestHeader(request); } @Override public InetAddress getLocalAddress() { final OperatedClientConnection conn = getWrappedConnection(); assertValid(conn); return conn.getLocalAddress(); } @Override public int getLocalPort() { final OperatedClientConnection conn = getWrappedConnection(); assertValid(conn); return conn.getLocalPort(); } @Override public InetAddress getRemoteAddress() { final OperatedClientConnection conn = getWrappedConnection(); assertValid(conn); return conn.getRemoteAddress(); } @Override public int getRemotePort() { final OperatedClientConnection conn = getWrappedConnection(); assertValid(conn); return conn.getRemotePort(); } @Override public boolean isSecure() { final OperatedClientConnection conn = getWrappedConnection(); assertValid(conn); return conn.isSecure(); } @Override public void bind(final Socket socket) throws IOException { throw new UnsupportedOperationException(); } @Override public Socket getSocket() { final OperatedClientConnection conn = getWrappedConnection(); assertValid(conn); if (!isOpen()) { return null; } return conn.getSocket(); } @Override public SSLSession getSSLSession() { final OperatedClientConnection conn = getWrappedConnection(); assertValid(conn); if (!isOpen()) { return null; } SSLSession result = null; final Socket sock = conn.getSocket(); if (sock instanceof SSLSocket) { result = ((SSLSocket)sock).getSession(); } return result; } @Override public void markReusable() { markedReusable = true; } @Override public void unmarkReusable() { markedReusable = false; } @Override public boolean isMarkedReusable() { return markedReusable; } @Override public void setIdleDuration(final long duration, final TimeUnit unit) { if(duration > 0) { this.duration = unit.toMillis(duration); } else { this.duration = -1; } } @Override public synchronized void releaseConnection() { if (released) { return; } released = true; connManager.releaseConnection(this, duration, TimeUnit.MILLISECONDS); } @Override public synchronized void abortConnection() { if (released) { return; } released = true; unmarkReusable(); try { shutdown(); } catch (final IOException ignore) { } connManager.releaseConnection(this, duration, TimeUnit.MILLISECONDS); } @Override public Object getAttribute(final String id) { final OperatedClientConnection conn = getWrappedConnection(); assertValid(conn); if (conn instanceof HttpContext) { return ((HttpContext) conn).getAttribute(id); } else { return null; } } @Override public Object removeAttribute(final String id) { final OperatedClientConnection conn = getWrappedConnection(); assertValid(conn); if (conn instanceof HttpContext) { return ((HttpContext) conn).removeAttribute(id); } else { return null; } } @Override public void setAttribute(final String id, final Object obj) { final OperatedClientConnection conn = getWrappedConnection(); assertValid(conn); if (conn instanceof HttpContext) { ((HttpContext) conn).setAttribute(id, obj); } } }





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