Source Code Cross Referenced for TCMessageImpl.java in  » Net » Terracotta » com » tc » net » protocol » tcm » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Net » Terracotta » com.tc.net.protocol.tcm 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * All content copyright (c) 2003-2006 Terracotta, Inc., except as may otherwise be noted in a separate copyright
003:         * notice. All rights reserved.
004:         */
005:        package com.tc.net.protocol.tcm;
006:
007:        import com.tc.bytes.TCByteBuffer;
008:        import com.tc.io.TCByteBufferInput;
009:        import com.tc.io.TCByteBufferInputStream;
010:        import com.tc.io.TCByteBufferOutput;
011:        import com.tc.io.TCSerializable;
012:        import com.tc.net.groups.ClientID;
013:        import com.tc.net.protocol.AbstractTCNetworkMessage;
014:        import com.tc.util.Assert;
015:        import com.tc.util.concurrent.SetOnceFlag;
016:
017:        import java.io.IOException;
018:
019:        /**
020:         * @author teck
021:         */
022:        public abstract class TCMessageImpl extends AbstractTCNetworkMessage
023:                implements  TCMessage {
024:
025:            private final MessageMonitor monitor;
026:            private final SetOnceFlag processed = new SetOnceFlag();
027:            private final SetOnceFlag isSent = new SetOnceFlag();
028:            private final TCMessageType type;
029:            private final MessageChannel channel;
030:            private int nvCount;
031:
032:            private TCByteBufferOutput out;
033:            private TCByteBufferInputStream bbis;
034:            private int messageVersion;
035:
036:            /**
037:             * Creates a new TCMessage to write data into (ie. to send to the network)
038:             */
039:            protected TCMessageImpl(MessageMonitor monitor,
040:                    TCByteBufferOutput output, MessageChannel channel,
041:                    TCMessageType type) {
042:                super (new TCMessageHeaderImpl(type));
043:                this .monitor = monitor;
044:                this .type = type;
045:                this .channel = channel;
046:
047:                // this.bbos = new TCByteBufferOutputStream(4, 4096, false);
048:                this .out = output;
049:
050:                // write out a zero. When dehydrated, this space will be replaced with the NV count
051:                this .out.writeInt(0);
052:            }
053:
054:            /**
055:             * Creates a new TCMessage object backed by the given data array (used when messages are read from the network)
056:             * 
057:             * @param header
058:             * @param data
059:             */
060:            protected TCMessageImpl(MessageMonitor monitor,
061:                    MessageChannel channel, TCMessageHeader header,
062:                    TCByteBuffer[] data) {
063:                super (header, data);
064:                this .monitor = monitor;
065:                this .type = TCMessageType.getInstance(header.getMessageType());
066:                this .messageVersion = header.getMessageTypeVersion();
067:                this .bbis = new TCByteBufferInputStream(data);
068:                this .channel = channel;
069:            }
070:
071:            public TCMessageType getMessageType() {
072:                return type;
073:            }
074:
075:            protected int getMessageVersion() {
076:                return this .messageVersion;
077:            }
078:
079:            protected void setMessageVersion(int version) {
080:                this .messageVersion = version;
081:            }
082:
083:            // use me to read directly from the message data (as opposed to using the name-value mechanism)
084:            protected TCByteBufferInput getInputStream() {
085:                return this .bbis;
086:            }
087:
088:            // use me to write directly to the message data (as opposed to using the name-value mechanism)
089:            // protected TCByteBufferOutputStream getOutputStream() {
090:            // return this.bbos;
091:            // }
092:
093:            protected void dehydrateValues() {
094:                // override me to add NV data to your message
095:            }
096:
097:            /**
098:             * Prepares all instance data into the payload byte buffer array in preparation for sending it.
099:             */
100:            public void dehydrate() {
101:                if (processed.attemptSet()) {
102:                    try {
103:                        dehydrateValues();
104:
105:                        final TCByteBuffer[] nvData = out.toArray();
106:
107:                        Assert.eval(nvData.length > 0);
108:                        nvData[0].putInt(0, nvCount);
109:                        setPayload(nvData);
110:
111:                        TCMessageHeader hdr = (TCMessageHeader) getHeader();
112:                        hdr.setMessageType(getMessageType().getType());
113:                        hdr.setMessageTypeVersion(getMessageVersion());
114:
115:                        seal();
116:                    } catch (Throwable t) {
117:                        t.printStackTrace();
118:                        throw new RuntimeException(t);
119:                    } finally {
120:                        this .out.close();
121:                        if (!isOutputStreamRecycled())
122:                            this .out = null;
123:                    }
124:                }
125:            }
126:
127:            /**
128:             * Reads the payload byte buffer data and sets instance data. This should be called after the message is read from the
129:             * network before it is released to the client for use. XXX:: This synchronization is there to create proper memory
130:             * boundary.
131:             */
132:            public synchronized void hydrate() throws IOException,
133:                    UnknownNameException {
134:                if (processed.attemptSet()) {
135:                    try {
136:                        final int count = bbis.readInt();
137:                        if (count < 0) {
138:                            throw new IOException("negative NV count: " + count);
139:                        }
140:
141:                        for (int i = 0; i < count; i++) {
142:                            final byte name = bbis.readByte();
143:                            if (!hydrateValue(name)) {
144:                                logger.error(" Hydrate Error - " + toString());
145:                                throw new UnknownNameException(getClass(), name);
146:                            }
147:                        }
148:                    } finally {
149:                        this .bbis.close();
150:                        this .bbis = null;
151:                        doRecycleOnRead();
152:                    }
153:                    monitor.newIncomingMessage(this );
154:                }
155:            }
156:
157:            // Can be overloaded by sub classes to decide when to recycle differently.
158:            public void doRecycleOnRead() {
159:                recycle();
160:            }
161:
162:            // if a subclass calls recycleOutputStream, then they need to override this method to return true
163:            protected boolean isOutputStreamRecycled() {
164:                return false;
165:            }
166:
167:            protected void recycleOutputStream() {
168:                if (out != null) {
169:                    out.recycle();
170:                }
171:            }
172:
173:            /**
174:             * Subclasses *really* must implement this to set appropriate instance variables with the value of the given name.
175:             * Return false if the given name is unknown to your message class
176:             * 
177:             * @param name
178:             */
179:            protected boolean hydrateValue(byte name) throws IOException {
180:                if (false) {
181:                    throw new IOException("silence compiler warning");
182:                }
183:                return false;
184:            }
185:
186:            protected boolean getBooleanValue() throws IOException {
187:                return bbis.readBoolean();
188:            }
189:
190:            protected byte getByteValue() throws IOException {
191:                return bbis.readByte();
192:            }
193:
194:            protected char getCharValue() throws IOException {
195:                return bbis.readChar();
196:            }
197:
198:            protected double getDoubleValue() throws IOException {
199:                return bbis.readDouble();
200:            }
201:
202:            protected float getFloatValue() throws IOException {
203:                return bbis.readFloat();
204:            }
205:
206:            protected int getIntValue() throws IOException {
207:                return bbis.readInt();
208:            }
209:
210:            protected long getLongValue() throws IOException {
211:                return bbis.readLong();
212:            }
213:
214:            protected short getShortValue() throws IOException {
215:                return bbis.readShort();
216:            }
217:
218:            protected Object getObject(TCSerializable target)
219:                    throws IOException {
220:                return target.deserializeFrom(bbis);
221:            }
222:
223:            protected String getStringValue() throws IOException {
224:                return bbis.readString();
225:            }
226:
227:            protected byte[] getBytesArray() throws IOException {
228:                int length = bbis.readInt();
229:                byte bytes[] = new byte[length];
230:                int off = 0;
231:                while (length > 0) {
232:                    int read = bbis.read(bytes, off, length);
233:                    length -= read;
234:                    off += read;
235:                }
236:                return bytes;
237:            }
238:
239:            protected void putNVPair(byte name, boolean value) {
240:                nvCount++;
241:                out.write(name);
242:                out.writeBoolean(value);
243:            }
244:
245:            protected void putNVPair(byte name, byte value) {
246:                nvCount++;
247:                out.write(name);
248:                out.writeByte(value);
249:            }
250:
251:            protected void putNVPair(byte name, char value) {
252:                nvCount++;
253:                out.write(name);
254:                out.writeChar(value);
255:            }
256:
257:            protected void putNVPair(byte name, double value) {
258:                nvCount++;
259:                out.write(name);
260:                out.writeDouble(value);
261:            }
262:
263:            protected void putNVPair(byte name, float value) {
264:                nvCount++;
265:                out.write(name);
266:                out.writeFloat(value);
267:            }
268:
269:            protected void putNVPair(byte name, int value) {
270:                nvCount++;
271:                out.write(name);
272:                out.writeInt(value);
273:            }
274:
275:            protected void putNVPair(byte name, long value) {
276:                nvCount++;
277:                out.write(name);
278:                out.writeLong(value);
279:            }
280:
281:            protected void putNVPair(byte name, short value) {
282:                nvCount++;
283:                out.write(name);
284:                out.writeShort(value);
285:            }
286:
287:            protected void putNVPair(byte name, String value) {
288:                nvCount++;
289:                out.write(name);
290:                out.writeString(value);
291:            }
292:
293:            protected void putNVPair(byte name, TCSerializable object) {
294:                nvCount++;
295:                out.write(name);
296:                object.serializeTo(out);
297:            }
298:
299:            protected void putNVPair(byte name, TCByteBuffer[] data) {
300:                nvCount++;
301:                out.write(name);
302:                out.write(data);
303:            }
304:
305:            protected void putNVPair(byte name, byte[] bytes) {
306:                nvCount++;
307:                out.writeInt(bytes.length);
308:                out.write(bytes);
309:            }
310:
311:            public ChannelID getChannelID() {
312:                return channel.getChannelID();
313:            }
314:
315:            public MessageChannel getChannel() {
316:                return channel;
317:            }
318:
319:            /*
320:             * (non-Javadoc)
321:             * 
322:             * @see com.tc.net.protocol.tcm.ApplicationMessage#send()
323:             */
324:            public void send() {
325:                if (isSent.attemptSet()) {
326:                    dehydrate();
327:                    basicSend();
328:                }
329:            }
330:
331:            private void basicSend() {
332:                channel.send(this );
333:                monitor.newOutgoingMessage(this );
334:            }
335:
336:            // FIXME:: This is here till them tc-comms merge.
337:            // TODO:: Remove this method once getSourceID and getDestinationID is merged into truck. You can use those methods
338:            // instead.
339:            public ClientID getClientID() {
340:                return new ClientID(getChannelID());
341:            }
342:        }
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