home | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (AbstractClientConnAdapter.java)

This example source code file (AbstractClientConnAdapter.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java tags/keywords

abstractclientconnadapter, clientconnectionmanager, httpconnectionmetrics, httpexception, httpresponse, illegalstateexception, inetaddress, interruptedioexception, io, ioexception, net, network, no, operatedclientconnection, ssl, sslsession, sslsocket, threading, threads, timeunit

The AbstractClientConnAdapter.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;

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

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

/**
 * 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.
 * <p>
 * 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.
 * <p>
 * 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
 */
public abstract class AbstractClientConnAdapter implements ManagedClientConnection {

    /**
     * The connection manager, if any.
     * This attribute MUST NOT be final, so the adapter can be detached
     * from the connection manager without keeping a hard reference there.
     */
    private volatile 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 <i>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(ClientConnectionManager mgr,
                                        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;
        connManager = null; // base class attribute
        duration = Long.MAX_VALUE;
    }

    protected OperatedClientConnection getWrappedConnection() {
        return wrappedConnection;
    }
    
    protected ClientConnectionManager getManager() {
        return connManager;
    }
    
    protected final void assertNotAborted() throws InterruptedIOException {
        if (released) {
            throw new InterruptedIOException("Connection has been shut down");
        }
    }

    /**
     * Asserts that there is a wrapped connection to delegate to.
     *
     * @throws IllegalStateException    if there is no wrapped connection
     *                                  or connection has been aborted
     */
    protected final void assertValid(
            final OperatedClientConnection wrappedConn) throws IllegalStateException {
        if (wrappedConn == null) {
            throw new IllegalStateException("No wrapped connection");
        }
    }

    public boolean isOpen() {
        OperatedClientConnection conn = getWrappedConnection();
        if (conn == null)
            return false;

        return conn.isOpen();
    }

    public boolean isStale() {
        if (released)
            return true;
        OperatedClientConnection conn = getWrappedConnection();
        if (conn == null)
            return true;

        return conn.isStale();
    }

    public void setSocketTimeout(int timeout) {
        OperatedClientConnection conn = getWrappedConnection();
        assertValid(conn);
        conn.setSocketTimeout(timeout);
    }

    public int getSocketTimeout() {
        OperatedClientConnection conn = getWrappedConnection();
        assertValid(conn);
        return conn.getSocketTimeout();
    }

    public HttpConnectionMetrics getMetrics() {
        OperatedClientConnection conn = getWrappedConnection();
        assertValid(conn);
        return conn.getMetrics();
    }

    public void flush() throws IOException {
        assertNotAborted();
        OperatedClientConnection conn = getWrappedConnection();
        assertValid(conn);
        conn.flush();
    }

    public boolean isResponseAvailable(int timeout) throws IOException {
        assertNotAborted();
        OperatedClientConnection conn = getWrappedConnection();
        assertValid(conn);
        return conn.isResponseAvailable(timeout);
    }

    public void receiveResponseEntity(HttpResponse response)
        throws HttpException, IOException {
        assertNotAborted();
        OperatedClientConnection conn = getWrappedConnection();
        assertValid(conn);
        unmarkReusable();
        conn.receiveResponseEntity(response);
    }

    public HttpResponse receiveResponseHeader()
        throws HttpException, IOException {
        assertNotAborted();
        OperatedClientConnection conn = getWrappedConnection();
        assertValid(conn);
        unmarkReusable();
        return conn.receiveResponseHeader();
    }

    public void sendRequestEntity(HttpEntityEnclosingRequest request)
        throws HttpException, IOException {
        assertNotAborted();
        OperatedClientConnection conn = getWrappedConnection();
        assertValid(conn);
        unmarkReusable();
        conn.sendRequestEntity(request);
    }

    public void sendRequestHeader(HttpRequest request)
        throws HttpException, IOException {
        assertNotAborted();
        OperatedClientConnection conn = getWrappedConnection();
        assertValid(conn);
        unmarkReusable();
        conn.sendRequestHeader(request);
    }

    public InetAddress getLocalAddress() {
        OperatedClientConnection conn = getWrappedConnection();
        assertValid(conn);
        return conn.getLocalAddress();
    }

    public int getLocalPort() {
        OperatedClientConnection conn = getWrappedConnection();
        assertValid(conn);
        return conn.getLocalPort();
    }

    public InetAddress getRemoteAddress() {
        OperatedClientConnection conn = getWrappedConnection();
        assertValid(conn);
        return conn.getRemoteAddress();
    }

    public int getRemotePort() {
        OperatedClientConnection conn = getWrappedConnection();
        assertValid(conn);
        return conn.getRemotePort();
    }

    public boolean isSecure() {
        OperatedClientConnection conn = getWrappedConnection();
        assertValid(conn);
        return conn.isSecure();
    }

    public SSLSession getSSLSession() {
        OperatedClientConnection conn = getWrappedConnection();
        assertValid(conn);
        if (!isOpen())
            return null;

        SSLSession result = null;
        Socket    sock    = conn.getSocket();
        if (sock instanceof SSLSocket) {
            result = ((SSLSocket)sock).getSession();
        }
        return result;
    }

    public void markReusable() {
        markedReusable = true;
    }

    public void unmarkReusable() {
        markedReusable = false;
    }

    public boolean isMarkedReusable() {
        return markedReusable;
    }
    
    public void setIdleDuration(long duration, TimeUnit unit) {
        if(duration > 0) {
            this.duration = unit.toMillis(duration);
        } else {
            this.duration = -1;
        }
    }

    public synchronized void releaseConnection() {
        if (released) {
            return;
        }
        released = true;
        if (connManager != null) {
            connManager.releaseConnection(this, duration, TimeUnit.MILLISECONDS);
        }
    }

    public synchronized void abortConnection() {
        if (released) {
            return;
        }
        released = true;
        unmarkReusable();
        try {
            shutdown();
        } catch (IOException ignore) {
        }
        if (connManager != null) {
            connManager.releaseConnection(this, duration, TimeUnit.MILLISECONDS);
        }
    }

}

Other Java examples (source code examples)

Here is a short list of links related to this Java AbstractClientConnAdapter.java source code file:



my book on functional programming

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.