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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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159 @SuppressWarnings("unchecked")
160 public SimpleIoProcessorPool(Class<? extends IoProcessor<S>> processorType, Executor executor, int size,
161 SelectorProvider selectorProvider) {
162 if (processorType == null) {
163 throw new IllegalArgumentException("processorType");
164 }
165
166 if (size <= 0) {
167 throw new IllegalArgumentException("size: " + size + " (expected: positive integer)");
168 }
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170
171 createdExecutor = (executor == null);
172
173 if (createdExecutor) {
174 this.executor = Executors.newCachedThreadPool();
175
176 ((ThreadPoolExecutor) this.executor).setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
177 } else {
178 this.executor = executor;
179 }
180
181 pool = new IoProcessor[size];
182
183 boolean success = false;
184 Constructor<? extends IoProcessor<S>> processorConstructor = null;
185 boolean usesExecutorArg = true;
186
187 try {
188
189 try {
190 try {
191 processorConstructor = processorType.getConstructor(ExecutorService.class);
192 pool[0] = processorConstructor.newInstance(this.executor);
193 } catch (NoSuchMethodException e1) {
194
195 try {
196 if(selectorProvider==null) {
197 processorConstructor = processorType.getConstructor(Executor.class);
198 pool[0] = processorConstructor.newInstance(this.executor);
199 } else {
200 processorConstructor = processorType.getConstructor(Executor.class, SelectorProvider.class);
201 pool[0] = processorConstructor.newInstance(this.executor,selectorProvider);
202 }
203 } catch (NoSuchMethodException e2) {
204
205 try {
206 processorConstructor = processorType.getConstructor();
207 usesExecutorArg = false;
208 pool[0] = processorConstructor.newInstance();
209 } catch (NoSuchMethodException e3) {
210
211 }
212 }
213 }
214 } catch (RuntimeException re) {
215 LOGGER.error("Cannot create an IoProcessor :{}", re.getMessage());
216 throw re;
217 } catch (Exception e) {
218 String msg = "Failed to create a new instance of " + processorType.getName() + ":" + e.getMessage();
219 LOGGER.error(msg, e);
220 throw new RuntimeIoException(msg, e);
221 }
222
223 if (processorConstructor == null) {
224
225 String msg = String.valueOf(processorType) + " must have a public constructor with one "
226 + ExecutorService.class.getSimpleName() + " parameter, a public constructor with one "
227 + Executor.class.getSimpleName() + " parameter or a public default constructor.";
228 LOGGER.error(msg);
229 throw new IllegalArgumentException(msg);
230 }
231
232
233 for (int i = 1; i < pool.length; i++) {
234 try {
235 if (usesExecutorArg) {
236 if(selectorProvider==null) {
237 pool[i] = processorConstructor.newInstance(this.executor);
238 } else {
239 pool[i] = processorConstructor.newInstance(this.executor, selectorProvider);
240 }
241 } else {
242 pool[i] = processorConstructor.newInstance();
243 }
244 } catch (Exception e) {
245
246 }
247 }
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249 success = true;
250 } finally {
251 if (!success) {
252 dispose();
253 }
254 }
255 }
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260 public final void add(S session) {
261 getProcessor(session).add(session);
262 }
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267 public final void flush(S session) {
268 getProcessor(session).flush(session);
269 }
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274 public final void write(S session, WriteRequest writeRequest) {
275 getProcessor(session).write(session, writeRequest);
276 }
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281 public final void remove(S session) {
282 getProcessor(session).remove(session);
283 }
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288 public final void updateTrafficControl(S session) {
289 getProcessor(session).updateTrafficControl(session);
290 }
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295 public boolean isDisposed() {
296 return disposed;
297 }
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302 public boolean isDisposing() {
303 return disposing;
304 }
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309 public final void dispose() {
310 if (disposed) {
311 return;
312 }
313
314 synchronized (disposalLock) {
315 if (!disposing) {
316 disposing = true;
317
318 for (IoProcessor<S> ioProcessor : pool) {
319 if (ioProcessor == null) {
320
321 continue;
322 }
323
324 if (ioProcessor.isDisposing()) {
325 continue;
326 }
327
328 try {
329 ioProcessor.dispose();
330 } catch (Exception e) {
331 LOGGER.warn("Failed to dispose the {} IoProcessor.", ioProcessor.getClass().getSimpleName(), e);
332 }
333 }
334
335 if (createdExecutor) {
336 ((ExecutorService) executor).shutdown();
337 }
338 }
339
340 Arrays.fill(pool, null);
341 disposed = true;
342 }
343 }
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349 @SuppressWarnings("unchecked")
350 private IoProcessor<S> getProcessor(S session) {
351 IoProcessor<S> processor = (IoProcessor<S>) session.getAttribute(PROCESSOR);
352
353 if (processor == null) {
354 if (disposed || disposing) {
355 throw new IllegalStateException("A disposed processor cannot be accessed.");
356 }
357
358 processor = pool[Math.abs((int) session.getId()) % pool.length];
359
360 if (processor == null) {
361 throw new IllegalStateException("A disposed processor cannot be accessed.");
362 }
363
364 session.setAttributeIfAbsent(PROCESSOR, processor);
365 }
366
367 return processor;
368 }
369 }