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/*
* $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/impl/AbstractHttpClientConnection.java $
* $Revision: 627457 $
* $Date: 2008-02-13 07:14:19 -0800 (Wed, 13 Feb 2008) $
*
* ====================================================================
* 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;
import java.io.IOException;
import org.apache.http.HttpClientConnection;
import org.apache.http.HttpConnectionMetrics;
import org.apache.http.HttpEntity;
import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.HttpException;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.HttpResponseFactory;
import org.apache.http.impl.entity.EntityDeserializer;
import org.apache.http.impl.entity.EntitySerializer;
import org.apache.http.impl.entity.LaxContentLengthStrategy;
import org.apache.http.impl.entity.StrictContentLengthStrategy;
import org.apache.http.impl.io.HttpRequestWriter;
import org.apache.http.impl.io.HttpResponseParser;
import org.apache.http.io.HttpMessageParser;
import org.apache.http.io.HttpMessageWriter;
import org.apache.http.io.SessionInputBuffer;
import org.apache.http.io.SessionOutputBuffer;
import org.apache.http.params.HttpParams;
/**
* Abstract client-side HTTP connection capable of transmitting and receiving data
* using arbitrary {@link SessionInputBuffer} and {@link SessionOutputBuffer}
*
* @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
*
* @version $Revision: 627457 $
*
* @since 4.0
*/
public abstract class AbstractHttpClientConnection implements HttpClientConnection {
private final EntitySerializer entityserializer;
private final EntityDeserializer entitydeserializer;
private SessionInputBuffer inbuffer = null;
private SessionOutputBuffer outbuffer = null;
private HttpMessageParser responseParser = null;
private HttpMessageWriter requestWriter = null;
private HttpConnectionMetricsImpl metrics = null;
public AbstractHttpClientConnection() {
super();
this.entityserializer = createEntitySerializer();
this.entitydeserializer = createEntityDeserializer();
}
protected abstract void assertOpen() throws IllegalStateException;
protected EntityDeserializer createEntityDeserializer() {
return new EntityDeserializer(new LaxContentLengthStrategy());
}
protected EntitySerializer createEntitySerializer() {
return new EntitySerializer(new StrictContentLengthStrategy());
}
protected HttpResponseFactory createHttpResponseFactory() {
return new DefaultHttpResponseFactory();
}
protected HttpMessageParser createResponseParser(
final SessionInputBuffer buffer,
final HttpResponseFactory responseFactory,
final HttpParams params) {
// override in derived class to specify a line parser
return new HttpResponseParser(buffer, null, responseFactory, params);
}
protected HttpMessageWriter createRequestWriter(
final SessionOutputBuffer buffer,
final HttpParams params) {
// override in derived class to specify a line formatter
return new HttpRequestWriter(buffer, null, params);
}
protected void init(
final SessionInputBuffer inbuffer,
final SessionOutputBuffer outbuffer,
final HttpParams params) {
if (inbuffer == null) {
throw new IllegalArgumentException("Input session buffer may not be null");
}
if (outbuffer == null) {
throw new IllegalArgumentException("Output session buffer may not be null");
}
this.inbuffer = inbuffer;
this.outbuffer = outbuffer;
this.responseParser = createResponseParser(
inbuffer,
createHttpResponseFactory(),
params);
this.requestWriter = createRequestWriter(
outbuffer, params);
this.metrics = new HttpConnectionMetricsImpl(
inbuffer.getMetrics(),
outbuffer.getMetrics());
}
public boolean isResponseAvailable(int timeout) throws IOException {
assertOpen();
return this.inbuffer.isDataAvailable(timeout);
}
public void sendRequestHeader(final HttpRequest request)
throws HttpException, IOException {
if (request == null) {
throw new IllegalArgumentException("HTTP request may not be null");
}
assertOpen();
this.requestWriter.write(request);
this.metrics.incrementRequestCount();
}
public void sendRequestEntity(final HttpEntityEnclosingRequest request)
throws HttpException, IOException {
if (request == null) {
throw new IllegalArgumentException("HTTP request may not be null");
}
assertOpen();
if (request.getEntity() == null) {
return;
}
this.entityserializer.serialize(
this.outbuffer,
request,
request.getEntity());
}
protected void doFlush() throws IOException {
this.outbuffer.flush();
}
public void flush() throws IOException {
assertOpen();
doFlush();
}
public HttpResponse receiveResponseHeader()
throws HttpException, IOException {
assertOpen();
HttpResponse response = (HttpResponse) this.responseParser.parse();
if (response.getStatusLine().getStatusCode() >= 200) {
this.metrics.incrementResponseCount();
}
return response;
}
public void receiveResponseEntity(final HttpResponse response)
throws HttpException, IOException {
if (response == null) {
throw new IllegalArgumentException("HTTP response may not be null");
}
assertOpen();
HttpEntity entity = this.entitydeserializer.deserialize(this.inbuffer, response);
response.setEntity(entity);
}
public boolean isStale() {
if (!isOpen()) {
return true;
}
try {
this.inbuffer.isDataAvailable(1);
return false;
} catch (IOException ex) {
return true;
}
}
public HttpConnectionMetrics getMetrics() {
return this.metrics;
}
}
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