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28 package org.apache.hc.client5.http.impl.async;
29
30 import java.io.InterruptedIOException;
31 import java.util.concurrent.atomic.AtomicReference;
32
33 import org.apache.hc.client5.http.HttpRoute;
34 import org.apache.hc.client5.http.async.AsyncExecRuntime;
35 import org.apache.hc.client5.http.config.RequestConfig;
36 import org.apache.hc.client5.http.impl.ConnPoolSupport;
37 import org.apache.hc.client5.http.impl.Operations;
38 import org.apache.hc.client5.http.protocol.HttpClientContext;
39 import org.apache.hc.core5.concurrent.Cancellable;
40 import org.apache.hc.core5.concurrent.ComplexCancellable;
41 import org.apache.hc.core5.concurrent.FutureCallback;
42 import org.apache.hc.core5.http.HttpHost;
43 import org.apache.hc.core5.http.HttpVersion;
44 import org.apache.hc.core5.http.nio.AsyncClientExchangeHandler;
45 import org.apache.hc.core5.http.nio.AsyncPushConsumer;
46 import org.apache.hc.core5.http.nio.HandlerFactory;
47 import org.apache.hc.core5.http.nio.command.RequestExecutionCommand;
48 import org.apache.hc.core5.io.CloseMode;
49 import org.apache.hc.core5.reactor.Command;
50 import org.apache.hc.core5.reactor.IOSession;
51 import org.apache.hc.core5.util.Identifiable;
52 import org.apache.hc.core5.util.TimeValue;
53 import org.apache.hc.core5.util.Timeout;
54 import org.slf4j.Logger;
55
56 class InternalH2AsyncExecRuntime implements AsyncExecRuntime {
57
58 private final Logger log;
59 private final InternalH2ConnPool connPool;
60 private final HandlerFactory<AsyncPushConsumer> pushHandlerFactory;
61 private final AtomicReference<Endpoint> sessionRef;
62 private volatile boolean reusable;
63
64 InternalH2AsyncExecRuntime(
65 final Logger log,
66 final InternalH2ConnPool connPool,
67 final HandlerFactory<AsyncPushConsumer> pushHandlerFactory) {
68 super();
69 this.log = log;
70 this.connPool = connPool;
71 this.pushHandlerFactory = pushHandlerFactory;
72 this.sessionRef = new AtomicReference<>();
73 }
74
75 @Override
76 public boolean isEndpointAcquired() {
77 return sessionRef.get() != null;
78 }
79
80 @Override
81 public Cancellable acquireEndpoint(
82 final String id,
83 final HttpRoute route,
84 final Object object,
85 final HttpClientContext context,
86 final FutureCallback<AsyncExecRuntime> callback) {
87 if (sessionRef.get() == null) {
88 final HttpHost target = route.getTargetHost();
89 final RequestConfig requestConfig = context.getRequestConfig();
90 @SuppressWarnings("deprecation")
91 final Timeout connectTimeout = requestConfig.getConnectTimeout();
92 if (log.isDebugEnabled()) {
93 log.debug("{} acquiring endpoint ({})", id, connectTimeout);
94 }
95 return Operations.cancellable(connPool.getSession(target, connectTimeout,
96 new FutureCallback<IOSession>() {
97
98 @Override
99 public void completed(final IOSession ioSession) {
100 sessionRef.set(new Endpoint(target, ioSession));
101 reusable = true;
102 if (log.isDebugEnabled()) {
103 log.debug("{} acquired endpoint", id);
104 }
105 context.setProtocolVersion(HttpVersion.HTTP_2);
106 callback.completed(InternalH2AsyncExecRuntime.this);
107 }
108
109 @Override
110 public void failed(final Exception ex) {
111 callback.failed(ex);
112 }
113
114 @Override
115 public void cancelled() {
116 callback.cancelled();
117 }
118
119 }));
120 }
121 callback.completed(this);
122 return Operations.nonCancellable();
123 }
124
125 private void closeEndpoint(final Endpoint endpoint) {
126 endpoint.session.close(CloseMode.GRACEFUL);
127 if (log.isDebugEnabled()) {
128 log.debug("{} endpoint closed", ConnPoolSupport.getId(endpoint));
129 }
130 }
131
132 @Override
133 public void releaseEndpoint() {
134 final Endpoint endpoint = sessionRef.getAndSet(null);
135 if (endpoint != null && !reusable) {
136 closeEndpoint(endpoint);
137 }
138 }
139
140 @Override
141 public void discardEndpoint() {
142 final Endpoint endpoint = sessionRef.getAndSet(null);
143 if (endpoint != null) {
144 closeEndpoint(endpoint);
145 }
146 }
147
148 @Override
149 public boolean validateConnection() {
150 if (reusable) {
151 final Endpoint endpoint = sessionRef.get();
152 return endpoint != null && endpoint.session.isOpen();
153 }
154 final Endpoint endpoint = sessionRef.getAndSet(null);
155 if (endpoint != null) {
156 closeEndpoint(endpoint);
157 }
158 return false;
159 }
160
161 @Override
162 public boolean isEndpointConnected() {
163 final Endpoint endpoint = sessionRef.get();
164 return endpoint != null && endpoint.session.isOpen();
165 }
166
167
168 Endpoint ensureValid() {
169 final Endpoint endpoint = sessionRef.get();
170 if (endpoint == null) {
171 throw new IllegalStateException("I/O session not acquired / already released");
172 }
173 return endpoint;
174 }
175
176 @Override
177 public Cancellable connectEndpoint(
178 final HttpClientContext context,
179 final FutureCallback<AsyncExecRuntime> callback) {
180 final Endpoint endpoint = ensureValid();
181 if (endpoint.session.isOpen()) {
182 callback.completed(this);
183 return Operations.nonCancellable();
184 }
185 final HttpHost target = endpoint.target;
186 final RequestConfig requestConfig = context.getRequestConfig();
187 @SuppressWarnings("deprecation")
188 final Timeout connectTimeout = requestConfig.getConnectTimeout();
189 if (log.isDebugEnabled()) {
190 log.debug("{} connecting endpoint ({})", ConnPoolSupport.getId(endpoint), connectTimeout);
191 }
192 return Operations.cancellable(connPool.getSession(target, connectTimeout,
193 new FutureCallback<IOSession>() {
194
195 @Override
196 public void completed(final IOSession ioSession) {
197 sessionRef.set(new Endpoint(target, ioSession));
198 reusable = true;
199 if (log.isDebugEnabled()) {
200 log.debug("{} endpoint connected", ConnPoolSupport.getId(endpoint));
201 }
202 callback.completed(InternalH2AsyncExecRuntime.this);
203 }
204
205 @Override
206 public void failed(final Exception ex) {
207 callback.failed(ex);
208 }
209
210 @Override
211 public void cancelled() {
212 callback.cancelled();
213 }
214
215 }));
216
217 }
218
219 @Override
220 public void upgradeTls(final HttpClientContext context) {
221 throw new UnsupportedOperationException();
222 }
223
224 @Override
225 public void upgradeTls(final HttpClientContext context, final FutureCallback<AsyncExecRuntime> callback) {
226 throw new UnsupportedOperationException();
227 }
228
229 @Override
230 public Cancellable execute(
231 final String id,
232 final AsyncClientExchangeHandler exchangeHandler, final HttpClientContext context) {
233 final ComplexCancellable complexCancellable = new ComplexCancellable();
234 final Endpoint endpoint = ensureValid();
235 final IOSession session = endpoint.session;
236 if (session.isOpen()) {
237 if (log.isDebugEnabled()) {
238 log.debug("{} start execution {}", ConnPoolSupport.getId(endpoint), id);
239 }
240 session.enqueue(
241 new RequestExecutionCommand(exchangeHandler, pushHandlerFactory, complexCancellable, context),
242 Command.Priority.NORMAL);
243 } else {
244 final HttpHost target = endpoint.target;
245 final RequestConfig requestConfig = context.getRequestConfig();
246 @SuppressWarnings("deprecation")
247 final Timeout connectTimeout = requestConfig.getConnectTimeout();
248 connPool.getSession(target, connectTimeout, new FutureCallback<IOSession>() {
249
250 @Override
251 public void completed(final IOSession ioSession) {
252 sessionRef.set(new Endpoint(target, ioSession));
253 reusable = true;
254 if (log.isDebugEnabled()) {
255 log.debug("{} start execution {}", ConnPoolSupport.getId(endpoint), id);
256 }
257 session.enqueue(
258 new RequestExecutionCommand(exchangeHandler, pushHandlerFactory, complexCancellable, context),
259 Command.Priority.NORMAL);
260 }
261
262 @Override
263 public void failed(final Exception ex) {
264 exchangeHandler.failed(ex);
265 }
266
267 @Override
268 public void cancelled() {
269 exchangeHandler.failed(new InterruptedIOException());
270 }
271
272 });
273 }
274 return complexCancellable;
275 }
276
277 @Override
278 public void markConnectionReusable(final Object newState, final TimeValue newValidDuration) {
279 throw new UnsupportedOperationException();
280 }
281
282 @Override
283 public void markConnectionNonReusable() {
284 reusable = false;
285 }
286
287 static class Endpoint implements Identifiable {
288
289 final HttpHost target;
290 final IOSession session;
291
292 Endpoint(final HttpHost target, final IOSession session) {
293 this.target = target;
294 this.session = session;
295 }
296
297 @Override
298 public String getId() {
299 return session.getId();
300 }
301
302 }
303
304 @Override
305 public AsyncExecRuntime fork() {
306 return new InternalH2AsyncExecRuntime(log, connPool, pushHandlerFactory);
307 }
308
309 }