/
AsyncHttpRequestRetryExec.java
187 lines (167 loc) · 7.84 KB
/
AsyncHttpRequestRetryExec.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
/*
* ====================================================================
* 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.hc.client5.http.impl.async;
import java.io.IOException;
import org.apache.hc.client5.http.HttpRequestRetryStrategy;
import org.apache.hc.client5.http.HttpRoute;
import org.apache.hc.client5.http.async.AsyncExecCallback;
import org.apache.hc.client5.http.async.AsyncExecChain;
import org.apache.hc.client5.http.async.AsyncExecChainHandler;
import org.apache.hc.client5.http.impl.RequestCopier;
import org.apache.hc.client5.http.protocol.HttpClientContext;
import org.apache.hc.core5.annotation.Contract;
import org.apache.hc.core5.annotation.Internal;
import org.apache.hc.core5.annotation.ThreadingBehavior;
import org.apache.hc.core5.http.EntityDetails;
import org.apache.hc.core5.http.HttpException;
import org.apache.hc.core5.http.HttpRequest;
import org.apache.hc.core5.http.HttpResponse;
import org.apache.hc.core5.http.nio.AsyncDataConsumer;
import org.apache.hc.core5.http.nio.AsyncEntityProducer;
import org.apache.hc.core5.http.nio.entity.NoopEntityConsumer;
import org.apache.hc.core5.util.Args;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Request executor in the asynchronous request execution chain that is
* responsible for making a decision whether a request that failed due to
* an I/O exception or received a specific response from the target server should
* be re-executed. Note that this exec chain handler <em>will not</em> respect
* {@link HttpRequestRetryStrategy#getRetryInterval(HttpResponse, int, org.apache.hc.core5.http.protocol.HttpContext)}.
* <p>
* Further responsibilities such as communication with the opposite
* endpoint is delegated to the next executor in the request execution
* chain.
* </p>
*
* @since 5.0
*/
@Contract(threading = ThreadingBehavior.STATELESS)
@Internal
public final class AsyncHttpRequestRetryExec implements AsyncExecChainHandler {
private static final Logger LOG = LoggerFactory.getLogger(AsyncHttpRequestRetryExec.class);
private final HttpRequestRetryStrategy retryStrategy;
public AsyncHttpRequestRetryExec(final HttpRequestRetryStrategy retryStrategy) {
Args.notNull(retryStrategy, "retryStrategy");
this.retryStrategy = retryStrategy;
}
private static class State {
volatile int execCount;
volatile boolean retrying;
}
private void internalExecute(
final State state,
final HttpRequest request,
final AsyncEntityProducer entityProducer,
final AsyncExecChain.Scope scope,
final AsyncExecChain chain,
final AsyncExecCallback asyncExecCallback) throws HttpException, IOException {
final String exchangeId = scope.exchangeId;
chain.proceed(RequestCopier.INSTANCE.copy(request), entityProducer, scope, new AsyncExecCallback() {
@Override
public AsyncDataConsumer handleResponse(
final HttpResponse response,
final EntityDetails entityDetails) throws HttpException, IOException {
final HttpClientContext clientContext = scope.clientContext;
if (entityProducer != null && !entityProducer.isRepeatable()) {
if (LOG.isDebugEnabled()) {
LOG.debug("{} cannot retry non-repeatable request", exchangeId);
}
return asyncExecCallback.handleResponse(response, entityDetails);
}
state.retrying = retryStrategy.retryRequest(response, state.execCount, clientContext);
if (state.retrying) {
return new NoopEntityConsumer();
} else {
return asyncExecCallback.handleResponse(response, entityDetails);
}
}
@Override
public void handleInformationResponse(final HttpResponse response) throws HttpException, IOException {
asyncExecCallback.handleInformationResponse(response);
}
@Override
public void completed() {
if (state.retrying) {
state.execCount++;
try {
internalExecute(state, request, entityProducer, scope, chain, asyncExecCallback);
} catch (final IOException | HttpException ex) {
asyncExecCallback.failed(ex);
}
} else {
asyncExecCallback.completed();
}
}
@Override
public void failed(final Exception cause) {
if (cause instanceof IOException) {
final HttpRoute route = scope.route;
final HttpClientContext clientContext = scope.clientContext;
if (entityProducer != null && !entityProducer.isRepeatable()) {
if (LOG.isDebugEnabled()) {
LOG.debug("{} cannot retry non-repeatable request", exchangeId);
}
} else if (retryStrategy.retryRequest(request, (IOException) cause, state.execCount, clientContext)) {
if (LOG.isDebugEnabled()) {
LOG.debug("{} {}", exchangeId, cause.getMessage(), cause);
}
if (LOG.isInfoEnabled()) {
LOG.info("Recoverable I/O exception ({}) caught when processing request to {}",
cause.getClass().getName(), route);
}
scope.execRuntime.discardEndpoint();
if (entityProducer != null) {
entityProducer.releaseResources();
}
state.retrying = true;
state.execCount++;
try {
internalExecute(state, request, entityProducer, scope, chain, asyncExecCallback);
} catch (final IOException | HttpException ex) {
asyncExecCallback.failed(ex);
}
return;
}
}
asyncExecCallback.failed(cause);
}
});
}
@Override
public void execute(
final HttpRequest request,
final AsyncEntityProducer entityProducer,
final AsyncExecChain.Scope scope,
final AsyncExecChain chain,
final AsyncExecCallback asyncExecCallback) throws HttpException, IOException {
final State state = new State();
state.execCount = 1;
state.retrying = false;
internalExecute(state, request, entityProducer, scope, chain, asyncExecCallback);
}
}