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Java example source code file (AbstractPooledConnAdapter.java)

This example source code file (AbstractPooledConnAdapter.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, abstractpooledconnadapter, abstractpoolentry, adapter, deprecated, httpcontext, httpparams, httproute, illegalstateexception, io, ioexception, object, operatedclientconnection, override

The AbstractPooledConnAdapter.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 org.apache.http.HttpHost;
import org.apache.http.params.HttpParams;
import org.apache.http.protocol.HttpContext;
import org.apache.http.conn.routing.HttpRoute;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.OperatedClientConnection;

/**
 * Abstract adapter from pool {@link AbstractPoolEntry entries} to
 * {@link org.apache.http.conn.ManagedClientConnection managed}
 * client connections.
 * The connection in the pool entry is used to initialize the base class.
 * In addition, methods to establish a route are delegated to the
 * pool entry. {@link #shutdown shutdown} and {@link #close close}
 * will clear the tracked route in the pool entry and call the
 * respective method of the wrapped connection.
 *
 * @since 4.0
 */
public abstract class AbstractPooledConnAdapter extends AbstractClientConnAdapter {

    /** The wrapped pool entry. */
    protected volatile AbstractPoolEntry poolEntry;

    /**
     * Creates a new connection adapter.
     *
     * @param manager   the connection manager
     * @param entry     the pool entry for the connection being wrapped
     */
    protected AbstractPooledConnAdapter(ClientConnectionManager manager,
                                        AbstractPoolEntry entry) {
        super(manager, entry.connection);
        this.poolEntry = entry;
    }

    /**
     * Asserts that this adapter is still attached.
     *
     * @throws IllegalStateException
     *      if it is {@link #detach detach}ed
     * @deprecated
     */
    @Deprecated
    protected final void assertAttached() {
        if (poolEntry == null) {
            throw new IllegalStateException("Adapter is detached.");
        }
    }

    /**
     * Detaches this adapter from the wrapped connection.
     * This adapter becomes useless.
     */
    @Override
    protected synchronized void detach() {
        super.detach();
        poolEntry = null;
    }

    public HttpRoute getRoute() {
        AbstractPoolEntry entry = poolEntry;
        if (entry == null) {
            throw new IllegalStateException("Adapter is detached.");
        }
        return (entry.tracker == null) ?
            null : entry.tracker.toRoute();
    }

    public void open(HttpRoute route,
                     HttpContext context, HttpParams params)
        throws IOException {
        assertNotAborted();
        AbstractPoolEntry entry = poolEntry;
        if (entry == null) {
            throw new IllegalStateException("Adapter is detached.");
        }
        entry.open(route, context, params);
    }

    public void tunnelTarget(boolean secure, HttpParams params)
        throws IOException {
        assertNotAborted();
        AbstractPoolEntry entry = poolEntry;
        if (entry == null) {
            throw new IllegalStateException("Adapter is detached.");
        }
        entry.tunnelTarget(secure, params);
    }

    public void tunnelProxy(HttpHost next, boolean secure, HttpParams params)
        throws IOException {
        assertNotAborted();
        AbstractPoolEntry entry = poolEntry;
        if (entry == null) {
            throw new IllegalStateException("Adapter is detached.");
        }
        entry.tunnelProxy(next, secure, params);
    }

    public void layerProtocol(HttpContext context, HttpParams params)
        throws IOException {
        assertNotAborted();
        AbstractPoolEntry entry = poolEntry;
        if (entry == null) {
            throw new IllegalStateException("Adapter is detached.");
        }
        entry.layerProtocol(context, params);
    }

    public void close() throws IOException {
        AbstractPoolEntry entry = poolEntry;
        if (entry != null)
            entry.shutdownEntry();

        OperatedClientConnection conn = getWrappedConnection();
        if (conn != null) {
            conn.close();
        }
    }

    public void shutdown() throws IOException {
        AbstractPoolEntry entry = poolEntry;
        if (entry != null)
            entry.shutdownEntry();

        OperatedClientConnection conn = getWrappedConnection();
        if (conn != null) {
            conn.shutdown();
        }
    }

    public Object getState() {
        AbstractPoolEntry entry = poolEntry;
        if (entry == null) {
            throw new IllegalStateException("Adapter is detached.");
        }
        return entry.getState();
    }

    public void setState(final Object state) {
        AbstractPoolEntry entry = poolEntry;
        if (entry == null) {
            throw new IllegalStateException("Adapter is detached.");
        }
        entry.setState(state);
    }

}

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