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Java example source code file (BasicEofSensorWatcher.java)

This example source code file (BasicEofSensorWatcher.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

basiceofsensorwatcher, connection, illegalargumentexception, io, ioexception, managedclientconnection, notthreadsafe

The BasicEofSensorWatcher.java example source code

/*
 * $Revision $
 * ====================================================================
 *
 *  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.conn;

import java.io.InputStream;
import java.io.IOException;

import org.apache.http.annotation.NotThreadSafe;

/**
 * Basic implementation of {@link EofSensorWatcher}. The underlying connection 
 * is released on close or EOF.
 *
 * @since 4.0
 */
@NotThreadSafe
public class BasicEofSensorWatcher implements EofSensorWatcher {

    /** The connection to auto-release. */
    protected final ManagedClientConnection managedConn;

    /** Whether to keep the connection alive. */
    protected final boolean attemptReuse;

    /**
     * Creates a new watcher for auto-releasing a connection.
     *
     * @param conn      the connection to auto-release
     * @param reuse     whether the connection should be re-used
     */
    public BasicEofSensorWatcher(ManagedClientConnection conn,
                                 boolean reuse) {
        if (conn == null)
            throw new IllegalArgumentException
                ("Connection may not be null.");

        managedConn = conn;
        attemptReuse = reuse;
    }

    public boolean eofDetected(InputStream wrapped)
        throws IOException {

        try {
            if (attemptReuse) {
                // there may be some cleanup required, such as
                // reading trailers after the response body:
                wrapped.close();
                managedConn.markReusable();
            }
        } finally {
            managedConn.releaseConnection();
        }
        return false;
    }

    public boolean streamClosed(InputStream wrapped)
        throws IOException {

        try {
            if (attemptReuse) {
                // this assumes that closing the stream will
                // consume the remainder of the response body:
                wrapped.close();
                managedConn.markReusable();
            }
        } finally {
            managedConn.releaseConnection();
        }
        return false;
    }

    public boolean streamAbort(InputStream wrapped)
        throws IOException {

        managedConn.abortConnection();
        return false;
    }

}

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