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Java example source code file (HttpRequestBase.java)

This example source code file (HttpRequestBase.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

abortablehttprequest, abstracthttpmessage, basicrequestline, clientconnectionrequest, cloneable, connectionreleasetrigger, httprequestbase, io, ioexception, net, network, object, override, protocolversion, reentrantlock, string, uri

The HttpRequestBase.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.client.methods;

import java.io.IOException;
import java.net.URI;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

import org.apache.http.annotation.NotThreadSafe;

import org.apache.http.ProtocolVersion;
import org.apache.http.RequestLine;
import org.apache.http.client.utils.CloneUtils;
import org.apache.http.conn.ClientConnectionRequest;
import org.apache.http.conn.ConnectionReleaseTrigger;
import org.apache.http.message.AbstractHttpMessage;
import org.apache.http.message.BasicRequestLine;
import org.apache.http.message.HeaderGroup;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams;

/**
 * Basic implementation of an HTTP request that can be modified.
 *
 *
 * @since 4.0
 */
@NotThreadSafe
public abstract class HttpRequestBase extends AbstractHttpMessage 
    implements HttpUriRequest, AbortableHttpRequest, Cloneable {

    private Lock abortLock;

    private boolean aborted;
    
    private URI uri;
    private ClientConnectionRequest connRequest;
    private ConnectionReleaseTrigger releaseTrigger;
    
    public HttpRequestBase() {
        super();
        this.abortLock = new ReentrantLock();
    }

    public abstract String getMethod();

    public ProtocolVersion getProtocolVersion() {
        return HttpProtocolParams.getVersion(getParams());
    }

    public URI getURI() {
        return this.uri;
    }
    
    public RequestLine getRequestLine() {
        String method = getMethod();
        ProtocolVersion ver = getProtocolVersion();
        URI uri = getURI();
        String uritext = null;
        if (uri != null) {
            uritext = uri.toASCIIString();
        }
        if (uritext == null || uritext.length() == 0) {
            uritext = "/";
        }
        return new BasicRequestLine(method, uritext, ver);
    }

    public void setURI(final URI uri) {
        this.uri = uri;
    }

    public void setConnectionRequest(final ClientConnectionRequest connRequest)
            throws IOException {
        this.abortLock.lock();
        try {
            if (this.aborted) {
                throw new IOException("Request already aborted");
            }
            
            this.releaseTrigger = null;
            this.connRequest = connRequest;
        } finally {
            this.abortLock.unlock();
        }
    }

    public void setReleaseTrigger(final ConnectionReleaseTrigger releaseTrigger)
            throws IOException {
        this.abortLock.lock();
        try {
            if (this.aborted) {
                throw new IOException("Request already aborted");
            }
            
            this.connRequest = null;
            this.releaseTrigger = releaseTrigger;
        } finally {
            this.abortLock.unlock();
        }
    }
    
    public void abort() {
        ClientConnectionRequest localRequest;
        ConnectionReleaseTrigger localTrigger;
        
        this.abortLock.lock();
        try {
            if (this.aborted) {
                return;
            }            
            this.aborted = true;
            
            localRequest = connRequest;
            localTrigger = releaseTrigger;
        } finally {
            this.abortLock.unlock();
        }        

        // Trigger the callbacks outside of the lock, to prevent
        // deadlocks in the scenario where the callbacks have
        // their own locks that may be used while calling
        // setReleaseTrigger or setConnectionRequest.
        if (localRequest != null) {
            localRequest.abortRequest();
        }
        if (localTrigger != null) {
            try {
                localTrigger.abortConnection();
            } catch (IOException ex) {
                // ignore
            }
        }
    }
    
    public boolean isAborted() {
        return this.aborted;
    }

    @Override
    public Object clone() throws CloneNotSupportedException {
        HttpRequestBase clone = (HttpRequestBase) super.clone();
        clone.abortLock = new ReentrantLock();
        clone.aborted = false;
        clone.releaseTrigger = null;
        clone.connRequest = null;
        clone.headergroup = (HeaderGroup) CloneUtils.clone(this.headergroup);
        clone.params = (HttpParams) CloneUtils.clone(this.params);
        return clone;
    }
    
}

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