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20 package org.apache.mina.core.service;
21
22 import java.lang.reflect.Constructor;
23 import java.nio.channels.spi.SelectorProvider;
24 import java.util.Arrays;
25 import java.util.concurrent.Executor;
26 import java.util.concurrent.ExecutorService;
27 import java.util.concurrent.Executors;
28 import java.util.concurrent.ThreadPoolExecutor;
29
30 import org.apache.mina.core.RuntimeIoException;
31 import org.apache.mina.core.session.AbstractIoSession;
32 import org.apache.mina.core.session.AttributeKey;
33 import org.apache.mina.core.session.IoSession;
34 import org.apache.mina.core.write.WriteRequest;
35 import org.slf4j.Logger;
36 import org.slf4j.LoggerFactory;
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80 public class SimpleIoProcessorPool<S extends AbstractIoSession> implements IoProcessor<S> {
81
82 private final static Logger LOGGER = LoggerFactory.getLogger(SimpleIoProcessorPool.class);
83
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85 private static final int DEFAULT_SIZE = Runtime.getRuntime().availableProcessors() + 1;
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88 private static final AttributeKey PROCESSOR = new AttributeKey(SimpleIoProcessorPool.class, "processor");
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91 private final IoProcessor<S>[] pool;
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94 private final Executor executor;
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97 private final boolean createdExecutor;
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100 private final Object disposalLock = new Object();
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103 private volatile boolean disposing;
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106 private volatile boolean disposed;
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114 public SimpleIoProcessorPool(Class<? extends IoProcessor<S>> processorType) {
115 this(processorType, null, DEFAULT_SIZE, null);
116 }
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125 public SimpleIoProcessorPool(Class<? extends IoProcessor<S>> processorType, int size) {
126 this(processorType, null, size, null);
127 }
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137 public SimpleIoProcessorPool(Class<? extends IoProcessor<S>> processorType, int size, SelectorProvider selectorProvider) {
138 this(processorType, null, size, selectorProvider);
139 }
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147 public SimpleIoProcessorPool(Class<? extends IoProcessor<S>> processorType, Executor executor) {
148 this(processorType, executor, DEFAULT_SIZE, null);
149 }
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158 @SuppressWarnings("unchecked")
159 public SimpleIoProcessorPool(Class<? extends IoProcessor<S>> processorType, Executor executor, int size, SelectorProvider selectorProvider) {
160 if (processorType == null) {
161 throw new IllegalArgumentException("processorType");
162 }
163
164 if (size <= 0) {
165 throw new IllegalArgumentException("size: " + size + " (expected: positive integer)");
166 }
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168
169 createdExecutor = (executor == null);
170
171 if (createdExecutor) {
172 this.executor = Executors.newCachedThreadPool();
173
174 ((ThreadPoolExecutor) this.executor).setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
175 } else {
176 this.executor = executor;
177 }
178
179 pool = new IoProcessor[size];
180
181 boolean success = false;
182 Constructor<? extends IoProcessor<S>> processorConstructor = null;
183 boolean usesExecutorArg = true;
184
185 try {
186
187 try {
188 try {
189 processorConstructor = processorType.getConstructor(ExecutorService.class);
190 pool[0] = processorConstructor.newInstance(this.executor);
191 } catch (NoSuchMethodException e1) {
192
193 try {
194 if(selectorProvider==null) {
195 processorConstructor = processorType.getConstructor(Executor.class);
196 pool[0] = processorConstructor.newInstance(this.executor);
197 } else {
198 processorConstructor = processorType.getConstructor(Executor.class, SelectorProvider.class);
199 pool[0] = processorConstructor.newInstance(this.executor,selectorProvider);
200 }
201 } catch (NoSuchMethodException e2) {
202
203 try {
204 processorConstructor = processorType.getConstructor();
205 usesExecutorArg = false;
206 pool[0] = processorConstructor.newInstance();
207 } catch (NoSuchMethodException e3) {
208
209 }
210 }
211 }
212 } catch (RuntimeException re) {
213 LOGGER.error("Cannot create an IoProcessor :{}", re.getMessage());
214 throw re;
215 } catch (Exception e) {
216 String msg = "Failed to create a new instance of " + processorType.getName() + ":" + e.getMessage();
217 LOGGER.error(msg, e);
218 throw new RuntimeIoException(msg, e);
219 }
220
221 if (processorConstructor == null) {
222
223 String msg = String.valueOf(processorType) + " must have a public constructor with one "
224 + ExecutorService.class.getSimpleName() + " parameter, a public constructor with one "
225 + Executor.class.getSimpleName() + " parameter or a public default constructor.";
226 LOGGER.error(msg);
227 throw new IllegalArgumentException(msg);
228 }
229
230
231 for (int i = 1; i < pool.length; i++) {
232 try {
233 if (usesExecutorArg) {
234 if(selectorProvider==null) {
235 pool[i] = processorConstructor.newInstance(this.executor);
236 } else {
237 pool[i] = processorConstructor.newInstance(this.executor, selectorProvider);
238 }
239 } else {
240 pool[i] = processorConstructor.newInstance();
241 }
242 } catch (Exception e) {
243
244 }
245 }
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247 success = true;
248 } finally {
249 if (!success) {
250 dispose();
251 }
252 }
253 }
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258 public final void add(S session) {
259 getProcessor(session).add(session);
260 }
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265 public final void flush(S session) {
266 getProcessor(session).flush(session);
267 }
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272 public final void write(S session, WriteRequest writeRequest) {
273 getProcessor(session).write(session, writeRequest);
274 }
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279 public final void remove(S session) {
280 getProcessor(session).remove(session);
281 }
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286 public final void updateTrafficControl(S session) {
287 getProcessor(session).updateTrafficControl(session);
288 }
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293 public boolean isDisposed() {
294 return disposed;
295 }
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300 public boolean isDisposing() {
301 return disposing;
302 }
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307 public final void dispose() {
308 if (disposed) {
309 return;
310 }
311
312 synchronized (disposalLock) {
313 if (!disposing) {
314 disposing = true;
315
316 for (IoProcessor<S> ioProcessor : pool) {
317 if (ioProcessor == null) {
318
319 continue;
320 }
321
322 if (ioProcessor.isDisposing()) {
323 continue;
324 }
325
326 try {
327 ioProcessor.dispose();
328 } catch (Exception e) {
329 LOGGER.warn("Failed to dispose the {} IoProcessor.", ioProcessor.getClass().getSimpleName(), e);
330 }
331 }
332
333 if (createdExecutor) {
334 ((ExecutorService) executor).shutdown();
335 }
336 }
337
338 Arrays.fill(pool, null);
339 disposed = true;
340 }
341 }
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347 @SuppressWarnings("unchecked")
348 private IoProcessor<S> getProcessor(S session) {
349 IoProcessor<S> processor = (IoProcessor<S>) session.getAttribute(PROCESSOR);
350
351 if (processor == null) {
352 if (disposed || disposing) {
353 throw new IllegalStateException("A disposed processor cannot be accessed.");
354 }
355
356 processor = pool[Math.abs((int) session.getId()) % pool.length];
357
358 if (processor == null) {
359 throw new IllegalStateException("A disposed processor cannot be accessed.");
360 }
361
362 session.setAttributeIfAbsent(PROCESSOR, processor);
363 }
364
365 return processor;
366 }
367 }