org.apache.http.impl.nio.client.PipeliningClientExchangeHandlerImpl Maven / Gradle / Ivy
/*
* ====================================================================
* 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
*
* Instances of this class are expected to be accessed by one thread at a time only.
* The {@link #cancel()} method can be called concurrently by multiple threads.
*/
@Pipelined
class PipeliningClientExchangeHandlerImpl extends AbstractClientExchangeHandler {
private final HttpHost target;
private final Queue requestProducerQueue;
private final Queue> responseConsumerQueue;
private final Queue requestQueue;
private final Queue resultQueue;
private final HttpClientContext localContext;
private final BasicFuture> resultFuture;
private final HttpProcessor httpProcessor;
private final AtomicReference requestProducerRef;
private final AtomicReference> responseConsumerRef;
public PipeliningClientExchangeHandlerImpl(
final Log log,
final HttpHost target,
final List requestProducers,
final List> responseConsumers,
final HttpClientContext localContext,
final BasicFuture> resultFuture,
final NHttpClientConnectionManager connmgr,
final HttpProcessor httpProcessor,
final ConnectionReuseStrategy connReuseStrategy,
final ConnectionKeepAliveStrategy keepaliveStrategy) {
super(log, localContext, connmgr, connReuseStrategy, keepaliveStrategy);
Args.notNull(target, "HTTP target");
Args.notEmpty(requestProducers, "Request producer list");
Args.notEmpty(responseConsumers, "Response consumer list");
Args.check(requestProducers.size() == responseConsumers.size(),
"Number of request producers does not match that of response consumers");
this.target = target;
this.requestProducerQueue = new ConcurrentLinkedQueue(requestProducers);
this.responseConsumerQueue = new ConcurrentLinkedQueue>(responseConsumers);
this.requestQueue = new ConcurrentLinkedQueue();
this.resultQueue = new ConcurrentLinkedQueue();
this.localContext = localContext;
this.resultFuture = resultFuture;
this.httpProcessor = httpProcessor;
this.requestProducerRef = new AtomicReference(null);
this.responseConsumerRef = new AtomicReference>(null);
}
private void closeProducer(final HttpAsyncRequestProducer requestProducer) {
if (requestProducer != null) {
try {
requestProducer.close();
} catch (final IOException ex) {
this.log.debug("I/O error closing request producer", ex);
}
}
}
private void closeConsumer(final HttpAsyncResponseConsumer responseConsumer) {
if (responseConsumer != null) {
try {
responseConsumer.close();
} catch (final IOException ex) {
this.log.debug("I/O error closing response consumer", ex);
}
}
}
@Override
void releaseResources() {
closeProducer(this.requestProducerRef.getAndSet(null));
closeConsumer(this.responseConsumerRef.getAndSet(null));
while (!this.requestProducerQueue.isEmpty()) {
closeProducer(this.requestProducerQueue.remove());
}
while (!this.responseConsumerQueue.isEmpty()) {
closeConsumer(this.responseConsumerQueue.remove());
}
this.requestQueue.clear();
this.resultQueue.clear();
}
@Override
void executionFailed(final Exception ex) {
final HttpAsyncRequestProducer requestProducer = this.requestProducerRef.get();
if (requestProducer != null) {
requestProducer.failed(ex);
}
final HttpAsyncResponseConsumer responseConsumer = this.responseConsumerRef.get();
if (responseConsumer != null) {
responseConsumer.failed(ex);
}
for (final HttpAsyncResponseConsumer cancellable: this.responseConsumerQueue) {
cancellable.cancel();
}
}
@Override
boolean executionCancelled() {
final HttpAsyncResponseConsumer responseConsumer = this.responseConsumerRef.get();
final boolean cancelled = responseConsumer != null && responseConsumer.cancel();
this.resultFuture.cancel();
return cancelled;
}
public void start() throws HttpException, IOException {
if (this.log.isDebugEnabled()) {
this.log.debug("[exchange: " + getId() + "] start execution");
}
final HttpRoute route = new HttpRoute(this.target);
setRoute(route);
this.localContext.setAttribute(HttpClientContext.HTTP_TARGET_HOST, this.target);
this.localContext.setAttribute(HttpClientContext.HTTP_ROUTE, route);
requestConnection();
}
@Override
public HttpRequest generateRequest() throws IOException, HttpException {
verifytRoute();
if (!isRouteEstablished()) {
onRouteToTarget();
onRouteComplete();
}
final NHttpClientConnection localConn = getConnection();
this.localContext.setAttribute(HttpCoreContext.HTTP_CONNECTION, localConn);
Asserts.check(this.requestProducerRef.get() == null, "Inconsistent state: currentRequest producer is not null");
final HttpAsyncRequestProducer requestProducer = this.requestProducerQueue.poll();
if (requestProducer == null) {
return null;
}
this.requestProducerRef.set(requestProducer);
final HttpRequest original = requestProducer.generateRequest();
final HttpRequestWrapper currentRequest = HttpRequestWrapper.wrap(original);
final RequestConfig config = this.localContext.getRequestConfig();
if (config.getSocketTimeout() > 0) {
localConn.setSocketTimeout(config.getSocketTimeout());
}
this.httpProcessor.process(currentRequest, this.localContext);
this.requestQueue.add(currentRequest);
setCurrentRequest(currentRequest);
return currentRequest;
}
@Override
public void produceContent(
final ContentEncoder encoder, final IOControl ioctrl) throws IOException {
if (this.log.isDebugEnabled()) {
this.log.debug("[exchange: " + getId() + "] produce content");
}
final HttpAsyncRequestProducer requestProducer = this.requestProducerRef.get();
Asserts.check(requestProducer != null, "Inconsistent state: request producer is null");
requestProducer.produceContent(encoder, ioctrl);
if (encoder.isCompleted()) {
requestProducer.resetRequest();
}
}
@Override
public void requestCompleted() {
if (this.log.isDebugEnabled()) {
this.log.debug("[exchange: " + getId() + "] Request completed");
}
final HttpAsyncRequestProducer requestProducer = this.requestProducerRef.getAndSet(null);
Asserts.check(requestProducer != null, "Inconsistent state: request producer is null");
requestProducer.requestCompleted(this.localContext);
try {
requestProducer.close();
} catch (final IOException ioex) {
this.log.debug(ioex.getMessage(), ioex);
}
}
@Override
public void responseReceived(
final HttpResponse response) throws IOException, HttpException {
if (this.log.isDebugEnabled()) {
this.log.debug("[exchange: " + getId() + "] Response received " + response.getStatusLine());
}
Asserts.check(this.responseConsumerRef.get() == null, "Inconsistent state: response consumer is not null");
final HttpAsyncResponseConsumer responseConsumer = this.responseConsumerQueue.poll();
Asserts.check(responseConsumer != null, "Inconsistent state: response consumer queue is empty");
this.responseConsumerRef.set(responseConsumer);
final HttpRequest request = this.requestQueue.poll();
Asserts.check(request != null, "Inconsistent state: request queue is empty");
this.localContext.setAttribute(HttpCoreContext.HTTP_REQUEST, request);
this.localContext.setAttribute(HttpCoreContext.HTTP_RESPONSE, response);
this.httpProcessor.process(response, this.localContext);
responseConsumer.responseReceived(response);
setCurrentResponse(response);
}
@Override
public void consumeContent(
final ContentDecoder decoder, final IOControl ioctrl) throws IOException {
if (this.log.isDebugEnabled()) {
this.log.debug("[exchange: " + getId() + "] Consume content");
}
final HttpAsyncResponseConsumer responseConsumer = this.responseConsumerRef.get();
Asserts.check(responseConsumer != null, "Inconsistent state: response consumer is null");
responseConsumer.consumeContent(decoder, ioctrl);
}
@Override
public void responseCompleted() throws IOException, HttpException {
if (this.log.isDebugEnabled()) {
this.log.debug("[exchange: " + getId() + "] Response processed");
}
final boolean keepAlive = manageConnectionPersistence();
final HttpAsyncResponseConsumer responseConsumer = this.responseConsumerRef.getAndSet(null);
Asserts.check(responseConsumer != null, "Inconsistent state: response consumer is null");
try {
responseConsumer.responseCompleted(this.localContext);
final T result = responseConsumer.getResult();
final Exception ex = responseConsumer.getException();
try {
responseConsumer.close();
} catch (final IOException ioex) {
this.log.debug(ioex.getMessage(), ioex);
}
if (result != null) {
this.resultQueue.add(result);
} else {
failed(ex);
}
if (!this.resultFuture.isDone() && this.responseConsumerQueue.isEmpty()) {
this.resultFuture.completed(new ArrayList(this.resultQueue));
this.resultQueue.clear();
}
if (this.resultFuture.isDone()) {
close();
} else {
if (!keepAlive) {
failed(new ConnectionClosedException("Connection closed"));
} else {
final NHttpClientConnection localConn = getConnection();
if (localConn != null) {
localConn.requestOutput();
} else {
requestConnection();
}
}
}
} catch (final RuntimeException ex) {
failed(ex);
throw ex;
}
}
@Override
public void inputTerminated() {
failed(new ConnectionClosedException("Connection closed"));
}
public void abortConnection() {
discardConnection();
}
}