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Added facility to execute requests asynchronously using fluent HC API 

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1239732 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Oleg Kalnichevski 2012-02-02 17:21:56 +00:00
parent e2da283f21
commit aab1b368d7
7 changed files with 289 additions and 38 deletions
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88
fluent-hc/src/examples/org/apache/http/client/fluent/FluentAsync.java Normal file
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@ -0,0 +1,88 @@
/*
* ====================================================================
*
* 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.fluent;
import java.util.LinkedList;
import java.util.Queue;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import org.apache.http.concurrent.FutureCallback;
/**
* This example demonstrates how the he HttpClient fluent API can be used to execute multiple
* requests asynchronously using background threads.
*/
public class FluentAsync {
public static void main(String[] args)throws Exception {
// Use pool of two threads
ExecutorService threadpool = Executors.newFixedThreadPool(2);
Async async = Async.newInstance().use(threadpool);
Request[] requests = new Request[] {
Request.Get("http://www.google.com/"),
Request.Get("http://www.yahoo.com/"),
Request.Get("http://www.apache.com/"),
Request.Get("http://www.apple.com/")
};
Queue<Future<Content>> queue = new LinkedList<Future<Content>>();
// Execute requests asynchronously
for (final Request request: requests) {
Future<Content> future = async.execute(request, new FutureCallback<Content>() {
public void failed(final Exception ex) {
System.out.println(ex.getMessage() + ": " + request);
}
public void completed(final Content content) {
System.out.println("Request completed: " + request);
}
public void cancelled() {
}
});
queue.add(future);
}
while(!queue.isEmpty()) {
Future<Content> future = queue.remove();
try {
future.get();
} catch (ExecutionException ex) {
}
}
System.out.println("Done");
threadpool.shutdown();
}
}

119
fluent-hc/src/main/java/org/apache/http/client/fluent/Async.java Normal file
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@ -0,0 +1,119 @@
/*
* ====================================================================
*
* 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.fluent;
import java.util.concurrent.Future;
import org.apache.http.client.ResponseHandler;
import org.apache.http.concurrent.BasicFuture;
import org.apache.http.concurrent.FutureCallback;
public class Async {
private Executor executor;
private java.util.concurrent.Executor concurrentExec;
public static Async newInstance() {
return new Async();
}
Async() {
super();
}
public Async use(final Executor executor) {
this.executor = executor;
return this;
}
public Async use(final java.util.concurrent.Executor concurrentExec) {
this.concurrentExec = concurrentExec;
return this;
}
static class ExecRunnable<T> implements Runnable {
private final BasicFuture<T> future;
private final Request request;
private final Executor executor;
private final ResponseHandler<T> handler;
ExecRunnable(
final BasicFuture<T> future,
final Request request,
final Executor executor,
final ResponseHandler<T> handler) {
super();
this.future = future;
this.request = request;
this.executor = executor;
this.handler = handler;
}
public void run() {
try {
Response response = this.executor.execute(this.request);
T result = response.handleResponse(this.handler);
this.future.completed(result);
} catch (Exception ex) {
this.future.failed(ex);
}
}
}
public <T> Future<T> execute(
final Request request, final ResponseHandler<T> handler, final FutureCallback<T> callback) {
BasicFuture<T> future = new BasicFuture<T>(callback);
ExecRunnable<T> runnable = new ExecRunnable<T>(
future,
request,
this.executor != null ? this.executor : Executor.newInstance(),
handler);
if (this.concurrentExec != null) {
this.concurrentExec.execute(runnable);
} else {
Thread t = new Thread(runnable);
t.setDaemon(true);
t.start();
}
return future;
}
public <T> Future<T> execute(final Request request, final ResponseHandler<T> handler) {
return execute(request, handler, null);
}
public Future<Content> execute(final Request request, final FutureCallback<Content> callback) {
return execute(request, new ContentResponseHandler(), callback);
}
public Future<Content> execute(final Request request) {
return execute(request, new ContentResponseHandler(), null);
}
}

5
fluent-hc/src/main/java/org/apache/http/client/fluent/Content.java
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@ -70,4 +70,9 @@ public class Content {
return new ByteArrayInputStream(this.raw);
}
@Override
public String toString() {
return asString();
}
}

59
fluent-hc/src/main/java/org/apache/http/client/fluent/ContentResponseHandler.java Normal file
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@ -0,0 +1,59 @@
/*
* ====================================================================
*
* 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.fluent;
import java.io.IOException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpResponseException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.entity.ContentType;
import org.apache.http.util.EntityUtils;
class ContentResponseHandler implements ResponseHandler<Content> {
public Content handleResponse(
final HttpResponse response) throws ClientProtocolException, IOException {
StatusLine statusLine = response.getStatusLine();
HttpEntity entity = response.getEntity();
if (statusLine.getStatusCode() >= 300) {
throw new HttpResponseException(statusLine.getStatusCode(),
statusLine.getReasonPhrase());
}
if (entity != null) {
return new Content(
EntityUtils.toByteArray(entity),
ContentType.getOrDefault(entity));
} else {
return Content.NO_CONTENT;
}
}
}

30
fluent-hc/src/main/java/org/apache/http/client/fluent/Executor.java
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@ -41,7 +41,6 @@ import org.apache.http.client.CredentialsProvider;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.client.protocol.ClientContext;
import org.apache.http.conn.routing.HttpRoute;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.impl.auth.BasicScheme;
import org.apache.http.impl.client.BasicAuthCache;
@ -53,9 +52,16 @@ import org.apache.http.protocol.BasicHttpContext;
public class Executor {
final static PoolingClientConnectionManager CONNMGR = new PoolingClientConnectionManager(
SchemeRegistryFactory.createSystemDefault());
final static DefaultHttpClient CLIENT = new DefaultHttpClient(CONNMGR);
final static PoolingClientConnectionManager CONNMGR;
final static DefaultHttpClient CLIENT;
static {
CONNMGR = new PoolingClientConnectionManager(
SchemeRegistryFactory.createSystemDefault());
CONNMGR.setDefaultMaxPerRoute(100);
CONNMGR.setMaxTotal(200);
CLIENT = new DefaultHttpClient(CONNMGR);
}
public static Executor newInstance() {
return new Executor(CLIENT);
@ -142,27 +148,15 @@ public class Executor {
}
public Response execute(
final Request req) throws ClientProtocolException, IOException {
final Request request) throws ClientProtocolException, IOException {
this.localContext.setAttribute(ClientContext.CREDS_PROVIDER, this.credentialsProvider);
this.localContext.setAttribute(ClientContext.AUTH_CACHE, this.authCache);
this.localContext.setAttribute(ClientContext.COOKIE_STORE, this.cookieStore);
HttpRequestBase httprequest = req.getHttpRequest();
HttpRequestBase httprequest = request.getHttpRequest();
httprequest.reset();
return new Response(this.httpclient.execute(httprequest, this.localContext));
}
public static void setMaxTotal(int max) {
CONNMGR.setMaxTotal(max);
}
public static void setDefaultMaxPerRoute(int max) {
CONNMGR.setDefaultMaxPerRoute(max);
}
public static void setMaxPerRoute(final HttpRoute route, int max) {
CONNMGR.setMaxPerRoute(route, max);
}
public static void registerScheme(final Scheme scheme) {
CONNMGR.getSchemeRegistry().register(scheme);
}

5
fluent-hc/src/main/java/org/apache/http/client/fluent/Request.java
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@ -306,4 +306,9 @@ public class Request {
return body(new InputStreamEntity(instream, -1, contentType));
}
@Override
public String toString() {
return this.request.getRequestLine().toString();
}
}

21
fluent-hc/src/main/java/org/apache/http/client/fluent/Response.java
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@ -83,26 +83,7 @@ public class Response {
}
public Content returnContent() throws ClientProtocolException, IOException {
return handleResponse(new ResponseHandler<Content>() {
public Content handleResponse(
final HttpResponse response) throws ClientProtocolException, IOException {
StatusLine statusLine = response.getStatusLine();
HttpEntity entity = response.getEntity();
if (statusLine.getStatusCode() >= 300) {
throw new HttpResponseException(statusLine.getStatusCode(),
statusLine.getReasonPhrase());
}
if (entity != null) {
return new Content(
EntityUtils.toByteArray(entity),
ContentType.getOrDefault(entity));
} else {
return Content.NO_CONTENT;
}
}
});
return handleResponse(new ContentResponseHandler());
}
public HttpResponse returnResponse() throws IOException {