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20 package org.apache.mina.filter.buffer;
21
22 import java.io.BufferedOutputStream;
23 import java.util.concurrent.ConcurrentHashMap;
24
25 import org.apache.mina.core.buffer.IoBuffer;
26 import org.apache.mina.core.filterchain.IoFilter;
27 import org.apache.mina.core.filterchain.IoFilterAdapter;
28 import org.apache.mina.core.session.IoSession;
29 import org.apache.mina.core.write.DefaultWriteRequest;
30 import org.apache.mina.core.write.WriteRequest;
31 import org.apache.mina.filter.codec.ProtocolCodecFilter;
32 import org.apache.mina.util.LazyInitializedCacheMap;
33 import org.slf4j.Logger;
34 import org.slf4j.LoggerFactory;
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49 public final class BufferedWriteFilter extends IoFilterAdapter {
50 private final Logger logger = LoggerFactory.getLogger(BufferedWriteFilter.class);
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55 public final static int DEFAULT_BUFFER_SIZE = 8192;
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60 private int bufferSize = DEFAULT_BUFFER_SIZE;
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66 private final LazyInitializedCacheMap<IoSession, IoBuffer> buffersMap;
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72 public BufferedWriteFilter() {
73 this(DEFAULT_BUFFER_SIZE, null);
74 }
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82 public BufferedWriteFilter(int bufferSize) {
83 this(bufferSize, null);
84 }
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94 public BufferedWriteFilter(int bufferSize, LazyInitializedCacheMap<IoSession, IoBuffer> buffersMap) {
95 super();
96 this.bufferSize = bufferSize;
97 if (buffersMap == null) {
98 this.buffersMap = new LazyInitializedCacheMap<IoSession, IoBuffer>();
99 } else {
100 this.buffersMap = buffersMap;
101 }
102 }
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107 public int getBufferSize() {
108 return bufferSize;
109 }
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116 public void setBufferSize(int bufferSize) {
117 this.bufferSize = bufferSize;
118 }
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126 @Override
127 public void filterWrite(NextFilter nextFilter, IoSession session, WriteRequest writeRequest) throws Exception {
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129 Object data = writeRequest.getMessage();
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131 if (data instanceof IoBuffer) {
132 write(session, (IoBuffer) data);
133 } else {
134 throw new IllegalArgumentException("This filter should only buffer IoBuffer objects");
135 }
136 }
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144 private void write(IoSession session, IoBuffer data) {
145 IoBuffer dest = buffersMap.putIfAbsent(session, new IoBufferLazyInitializer(bufferSize));
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147 write(session, data, dest);
148 }
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160 private void write(IoSession session, IoBuffer data, IoBuffer buf) {
161 try {
162 int len = data.remaining();
163 if (len >= buf.capacity()) {
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168 NextFilter nextFilter = session.getFilterChain().getNextFilter(this);
169 internalFlush(nextFilter, session, buf);
170 nextFilter.filterWrite(session, new DefaultWriteRequest(data));
171 return;
172 }
173 if (len > (buf.limit() - buf.position())) {
174 internalFlush(session.getFilterChain().getNextFilter(this), session, buf);
175 }
176 synchronized (buf) {
177 buf.put(data);
178 }
179 } catch (Throwable e) {
180 session.getFilterChain().fireExceptionCaught(e);
181 }
182 }
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192 private void internalFlush(NextFilter nextFilter, IoSession session, IoBuffer buf) throws Exception {
193 IoBuffer tmp = null;
194 synchronized (buf) {
195 buf.flip();
196 tmp = buf.duplicate();
197 buf.clear();
198 }
199 logger.debug("Flushing buffer: {}", tmp);
200 nextFilter.filterWrite(session, new DefaultWriteRequest(tmp));
201 }
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208 public void flush(IoSession session) {
209 try {
210 internalFlush(session.getFilterChain().getNextFilter(this), session, buffersMap.get(session));
211 } catch (Throwable e) {
212 session.getFilterChain().fireExceptionCaught(e);
213 }
214 }
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222 private void free(IoSession session) {
223 IoBuffer buf = buffersMap.remove(session);
224 if (buf != null) {
225 buf.free();
226 }
227 }
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232 @Override
233 public void exceptionCaught(NextFilter nextFilter, IoSession session, Throwable cause) throws Exception {
234 free(session);
235 nextFilter.exceptionCaught(session, cause);
236 }
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241 @Override
242 public void sessionClosed(NextFilter nextFilter, IoSession session) throws Exception {
243 free(session);
244 nextFilter.sessionClosed(session);
245 }
246 }