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
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
|
// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.jdisc;
import com.yahoo.jdisc.handler.CompletionHandler;
import com.yahoo.jdisc.handler.ContentChannel;
import com.yahoo.jdisc.handler.DelegatedRequestHandler;
import com.yahoo.jdisc.handler.NullContent;
import com.yahoo.jdisc.handler.RequestHandler;
import com.yahoo.jdisc.handler.ResponseHandler;
import java.nio.ByteBuffer;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* @author bakksjo
*/
class ProxyRequestHandler implements DelegatedRequestHandler {
private static final CompletionHandler IGNORED_COMPLETION = new IgnoredCompletion();
private static final Logger log = Logger.getLogger(ProxyRequestHandler.class.getName());
final RequestHandler delegate;
ProxyRequestHandler(RequestHandler delegate) {
Objects.requireNonNull(delegate, "delegate");
this.delegate = delegate;
}
@Override
public ContentChannel handleRequest(Request request, ResponseHandler responseHandler) {
try (final ResourceReference requestReference = request.refer()) {
ContentChannel contentChannel;
final ResponseHandler proxyResponseHandler = new ProxyResponseHandler(
request, new NullContentResponseHandler(responseHandler));
try {
contentChannel = delegate.handleRequest(request, proxyResponseHandler);
Objects.requireNonNull(contentChannel, "contentChannel");
} catch (Throwable t) {
try {
proxyResponseHandler
.handleResponse(new Response(Response.Status.INTERNAL_SERVER_ERROR, t))
.close(IGNORED_COMPLETION);
} catch (Throwable ignored) {
// empty
}
throw t;
}
return new ProxyContentChannel(request, contentChannel);
}
}
@Override
public void handleTimeout(Request request, ResponseHandler responseHandler) {
delegate.handleTimeout(request, new NullContentResponseHandler(responseHandler));
}
@Override
public ResourceReference refer() {
return delegate.refer();
}
@Override
public ResourceReference refer(Object context) {
return delegate.refer(context);
}
@Override
public void release() {
delegate.release();
}
@Override
public String toString() {
return delegate.toString();
}
@Override
public RequestHandler getDelegate() {
return delegate;
}
private static class ProxyResponseHandler implements ResponseHandler {
final SharedResource request;
final ResourceReference requestReference;
final ResponseHandler delegate;
final AtomicBoolean closed = new AtomicBoolean(false);
ProxyResponseHandler(SharedResource request, ResponseHandler delegate) {
Objects.requireNonNull(request, "request");
Objects.requireNonNull(delegate, "delegate");
this.request = request;
this.delegate = delegate;
this.requestReference = request.refer(this);
}
@Override
public ContentChannel handleResponse(Response response) {
if (closed.getAndSet(true)) {
throw new IllegalStateException(delegate + " is already called.");
}
try (final ResourceReference ref = requestReference) {
ContentChannel contentChannel = delegate.handleResponse(response);
Objects.requireNonNull(contentChannel, "contentChannel");
return new ProxyContentChannel(request, contentChannel);
}
}
@Override
public String toString() {
return delegate.toString();
}
}
private static class ProxyContentChannel implements ContentChannel {
final SharedResource request;
final ResourceReference requestReference;
final ContentChannel delegate;
ProxyContentChannel(SharedResource request, ContentChannel delegate) {
Objects.requireNonNull(request, "request");
Objects.requireNonNull(delegate, "delegate");
this.request = request;
this.delegate = delegate;
this.requestReference = request.refer(this);
}
@Override
public void write(ByteBuffer buf, CompletionHandler completionHandler) {
ProxyCompletionHandler proxyCompletionHandler = new ProxyCompletionHandler(request, completionHandler);
try {
delegate.write(buf, proxyCompletionHandler);
} catch (Throwable t) {
try {
proxyCompletionHandler.failed(t);
} catch (Throwable ignored) {
// empty
}
throw t;
}
}
@Override
public void close(CompletionHandler completionHandler) {
final ProxyCompletionHandler proxyCompletionHandler
= new ProxyCompletionHandler(request, completionHandler);
try (final ResourceReference ref = requestReference) {
delegate.close(proxyCompletionHandler);
} catch (Throwable t) {
try {
proxyCompletionHandler.failed(t);
} catch (Throwable ignored) {
// empty
}
throw t;
}
}
@Override
public String toString() {
return delegate.toString();
}
}
private static class ProxyCompletionHandler implements CompletionHandler {
final ResourceReference requestReference;
final CompletionHandler delegate;
final AtomicBoolean closed = new AtomicBoolean(false);
public ProxyCompletionHandler(SharedResource request, CompletionHandler delegate) {
this.delegate = delegate;
this.requestReference = request.refer(this);
}
@Override
public void completed() {
if (closed.getAndSet(true)) {
throw new IllegalStateException(delegate + " is already called.");
}
try {
if (delegate != null) {
delegate.completed();
}
} finally {
requestReference.close();
}
}
@Override
public void failed(Throwable t) {
if (closed.getAndSet(true)) {
throw new IllegalStateException(delegate + " is already called.");
}
try (final ResourceReference ref = requestReference) {
if (delegate != null) {
delegate.failed(t);
} else {
log.log(Level.WARNING, "Uncaught completion failure.", t);
}
}
}
@Override
public String toString() {
return String.valueOf(delegate);
}
}
private static class NullContentResponseHandler implements ResponseHandler {
final ResponseHandler delegate;
NullContentResponseHandler(ResponseHandler delegate) {
Objects.requireNonNull(delegate, "delegate");
this.delegate = delegate;
}
@Override
public ContentChannel handleResponse(Response response) {
ContentChannel contentChannel = delegate.handleResponse(response);
if (contentChannel == null) {
contentChannel = NullContent.INSTANCE;
}
return contentChannel;
}
@Override
public String toString() {
return delegate.toString();
}
}
private static class IgnoredCompletion implements CompletionHandler {
@Override
public void completed() {
// ignore
}
@Override
public void failed(Throwable t) {
// ignore
}
}
}
|
