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/*
* ====================================================================
* 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
* .
*
*/
package org.apache.http.impl.client;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.net.URI;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.HttpHost;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.annotation.Contract;
import org.apache.http.annotation.ThreadingBehavior;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.ServiceUnavailableRetryStrategy;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.params.HttpParams;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.Args;
import org.apache.http.util.EntityUtils;
/**
* {@link HttpClient} implementation that can automatically retry the request in case of
* a non-2xx response using the {@link ServiceUnavailableRetryStrategy} interface.
*
* @since 4.2
*
* @deprecated (4.3) use {@link HttpClientBuilder}.
*/
@Deprecated
@Contract(threading = ThreadingBehavior.SAFE_CONDITIONAL)
public class AutoRetryHttpClient implements HttpClient {
private final HttpClient backend;
private final ServiceUnavailableRetryStrategy retryStrategy;
private final Log log = LogFactory.getLog(getClass());
public AutoRetryHttpClient(
final HttpClient client, final ServiceUnavailableRetryStrategy retryStrategy) {
super();
Args.notNull(client, "HttpClient");
Args.notNull(retryStrategy, "ServiceUnavailableRetryStrategy");
this.backend = client;
this.retryStrategy = retryStrategy;
}
/**
* Constructs a {@code AutoRetryHttpClient} with default caching settings that
* stores cache entries in memory and uses a vanilla
* {@link DefaultHttpClient} for backend requests.
*/
public AutoRetryHttpClient() {
this(new DefaultHttpClient(), new DefaultServiceUnavailableRetryStrategy());
}
/**
* Constructs a {@code AutoRetryHttpClient} with the given caching options that
* stores cache entries in memory and uses a vanilla
* {@link DefaultHttpClient} for backend requests.
*
* @param config
* retry configuration module options
*/
public AutoRetryHttpClient(final ServiceUnavailableRetryStrategy config) {
this(new DefaultHttpClient(), config);
}
/**
* Constructs a {@code AutoRetryHttpClient} with default caching settings that
* stores cache entries in memory and uses the given {@link HttpClient} for
* backend requests.
*
* @param client
* used to make origin requests
*/
public AutoRetryHttpClient(final HttpClient client) {
this(client, new DefaultServiceUnavailableRetryStrategy());
}
@Override
public HttpResponse execute(final HttpHost target, final HttpRequest request)
throws IOException {
final HttpContext defaultContext = null;
return execute(target, request, defaultContext);
}
@Override
public T execute(final HttpHost target, final HttpRequest request,
final ResponseHandler responseHandler) throws IOException {
return execute(target, request, responseHandler, null);
}
@Override
public T execute(final HttpHost target, final HttpRequest request,
final ResponseHandler responseHandler, final HttpContext context)
throws IOException {
final HttpResponse resp = execute(target, request, context);
return responseHandler.handleResponse(resp);
}
@Override
public HttpResponse execute(final HttpUriRequest request) throws IOException {
final HttpContext context = null;
return execute(request, context);
}
@Override
public HttpResponse execute(final HttpUriRequest request, final HttpContext context)
throws IOException {
final URI uri = request.getURI();
final HttpHost httpHost = new HttpHost(uri.getHost(), uri.getPort(),
uri.getScheme());
return execute(httpHost, request, context);
}
@Override
public T execute(final HttpUriRequest request,
final ResponseHandler responseHandler) throws IOException {
return execute(request, responseHandler, null);
}
@Override
public T execute(final HttpUriRequest request,
final ResponseHandler responseHandler, final HttpContext context)
throws IOException {
final HttpResponse resp = execute(request, context);
return responseHandler.handleResponse(resp);
}
@Override
public HttpResponse execute(final HttpHost target, final HttpRequest request,
final HttpContext context) throws IOException {
for (int c = 1;; c++) {
final HttpResponse response = backend.execute(target, request, context);
try {
if (retryStrategy.retryRequest(response, c, context)) {
EntityUtils.consume(response.getEntity());
final long nextInterval = retryStrategy.getRetryInterval();
try {
log.trace("Wait for " + nextInterval);
Thread.sleep(nextInterval);
} catch (final InterruptedException e) {
Thread.currentThread().interrupt();
throw new InterruptedIOException();
}
} else {
return response;
}
} catch (final RuntimeException ex) {
try {
EntityUtils.consume(response.getEntity());
} catch (final IOException ioex) {
log.warn("I/O error consuming response content", ioex);
}
throw ex;
}
}
}
@Override
public ClientConnectionManager getConnectionManager() {
return backend.getConnectionManager();
}
@Override
public HttpParams getParams() {
return backend.getParams();
}
}
