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204 lines
7.2 KiB
Java
204 lines
7.2 KiB
Java
/*
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* ====================================================================
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*
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*/
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package ch.boye.httpclientandroidlib.impl.client;
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import java.io.IOException;
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import java.io.InterruptedIOException;
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import java.net.ConnectException;
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import java.net.UnknownHostException;
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import java.util.Arrays;
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import java.util.Collection;
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import java.util.HashSet;
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import java.util.Set;
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import javax.net.ssl.SSLException;
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import ch.boye.httpclientandroidlib.HttpEntityEnclosingRequest;
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import ch.boye.httpclientandroidlib.HttpRequest;
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import ch.boye.httpclientandroidlib.annotation.Immutable;
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import ch.boye.httpclientandroidlib.client.HttpRequestRetryHandler;
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import ch.boye.httpclientandroidlib.client.methods.HttpUriRequest;
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import ch.boye.httpclientandroidlib.client.protocol.HttpClientContext;
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import ch.boye.httpclientandroidlib.protocol.HttpContext;
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import ch.boye.httpclientandroidlib.util.Args;
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/**
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* The default {@link HttpRequestRetryHandler} used by request executors.
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*
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* @since 4.0
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*/
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@Immutable
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public class DefaultHttpRequestRetryHandler implements HttpRequestRetryHandler {
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public static final DefaultHttpRequestRetryHandler INSTANCE = new DefaultHttpRequestRetryHandler();
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/** the number of times a method will be retried */
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private final int retryCount;
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/** Whether or not methods that have successfully sent their request will be retried */
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private final boolean requestSentRetryEnabled;
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private final Set<Class<? extends IOException>> nonRetriableClasses;
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/**
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* Create the request retry handler using the specified IOException classes
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*
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* @param retryCount how many times to retry; 0 means no retries
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* @param requestSentRetryEnabled true if it's OK to retry requests that have been sent
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* @param clazzes the IOException types that should not be retried
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* @since 4.3
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*/
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protected DefaultHttpRequestRetryHandler(
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final int retryCount,
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final boolean requestSentRetryEnabled,
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final Collection<Class<? extends IOException>> clazzes) {
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super();
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this.retryCount = retryCount;
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this.requestSentRetryEnabled = requestSentRetryEnabled;
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this.nonRetriableClasses = new HashSet<Class<? extends IOException>>();
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for (final Class<? extends IOException> clazz: clazzes) {
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this.nonRetriableClasses.add(clazz);
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}
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}
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/**
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* Create the request retry handler using the following list of
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* non-retriable IOException classes: <br>
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* <ul>
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* <li>InterruptedIOException</li>
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* <li>UnknownHostException</li>
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* <li>ConnectException</li>
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* <li>SSLException</li>
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* </ul>
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* @param retryCount how many times to retry; 0 means no retries
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* @param requestSentRetryEnabled true if it's OK to retry requests that have been sent
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*/
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@SuppressWarnings("unchecked")
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public DefaultHttpRequestRetryHandler(final int retryCount, final boolean requestSentRetryEnabled) {
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this(retryCount, requestSentRetryEnabled, Arrays.asList(
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InterruptedIOException.class,
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UnknownHostException.class,
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ConnectException.class,
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SSLException.class));
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}
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/**
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* Create the request retry handler with a retry count of 3, requestSentRetryEnabled false
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* and using the following list of non-retriable IOException classes: <br>
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* <ul>
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* <li>InterruptedIOException</li>
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* <li>UnknownHostException</li>
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* <li>ConnectException</li>
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* <li>SSLException</li>
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* </ul>
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*/
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public DefaultHttpRequestRetryHandler() {
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this(3, false);
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}
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/**
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* Used <code>retryCount</code> and <code>requestSentRetryEnabled</code> to determine
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* if the given method should be retried.
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*/
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public boolean retryRequest(
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final IOException exception,
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final int executionCount,
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final HttpContext context) {
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Args.notNull(exception, "Exception parameter");
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Args.notNull(context, "HTTP context");
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if (executionCount > this.retryCount) {
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// Do not retry if over max retry count
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return false;
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}
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if (this.nonRetriableClasses.contains(exception.getClass())) {
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return false;
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} else {
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for (final Class<? extends IOException> rejectException : this.nonRetriableClasses) {
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if (rejectException.isInstance(exception)) {
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return false;
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}
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}
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}
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final HttpClientContext clientContext = HttpClientContext.adapt(context);
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final HttpRequest request = clientContext.getRequest();
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if(requestIsAborted(request)){
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return false;
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}
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if (handleAsIdempotent(request)) {
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// Retry if the request is considered idempotent
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return true;
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}
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if (!clientContext.isRequestSent() || this.requestSentRetryEnabled) {
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// Retry if the request has not been sent fully or
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// if it's OK to retry methods that have been sent
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return true;
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}
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// otherwise do not retry
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return false;
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}
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/**
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* @return <code>true</code> if this handler will retry methods that have
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* successfully sent their request, <code>false</code> otherwise
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*/
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public boolean isRequestSentRetryEnabled() {
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return requestSentRetryEnabled;
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}
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/**
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* @return the maximum number of times a method will be retried
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*/
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public int getRetryCount() {
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return retryCount;
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}
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/**
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* @since 4.2
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*/
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protected boolean handleAsIdempotent(final HttpRequest request) {
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return !(request instanceof HttpEntityEnclosingRequest);
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}
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/**
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* @since 4.2
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*
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* @deprecated (4.3)
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*/
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@Deprecated
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protected boolean requestIsAborted(final HttpRequest request) {
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HttpRequest req = request;
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if (request instanceof RequestWrapper) { // does not forward request to original
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req = ((RequestWrapper) request).getOriginal();
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}
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return (req instanceof HttpUriRequest && ((HttpUriRequest)req).isAborted());
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}
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}
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