Source Code Cross Referenced for DbCacheChunk.java in  » Database-DBMS » Ozone-1.1 » org » ozoneDB » core » DbRemote » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » Ozone 1.1 » org.ozoneDB.core.DbRemote 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // You can redistribute this software and/or modify it under the terms of
002:        // the Ozone Core License version 1 published by ozone-db.org.
003:        //
004:        // The original code and portions created by SMB are
005:        // Copyright (C) 1997-@year@ by SMB GmbH. All rights reserved.
006:        //
007:        // $Id: DbCacheChunk.java,v 1.2 2002/06/08 00:49:38 mediumnet Exp $
008:
009:        package org.ozoneDB.core.DbRemote;
010:
011:        import java.io.*;
012:        import java.lang.reflect.*;
013:        import org.ozoneDB.DxLib.*;
014:        import org.ozoneDB.*;
015:        import org.ozoneDB.core.*;
016:        import org.ozoneDB.util.*;
017:
018:        /**
019:         * Read/write a chunk of objects from/to the server. This is used by the
020:         * {@link ClientCacheDatabase} to fetch/sync objects from/to the server.
021:         * 
022:         * 
023:         * @author <a href="http://www.softwarebuero.de/">SMB</a>
024:         * @version $Revision: 1.2 $Date: 2002/06/08 00:49:38 $
025:         */
026:        public final class DbCacheChunk extends DbCommand implements 
027:                Externalizable {
028:
029:            private final static byte MODE_READ = 1;
030:            private final static byte MODE_WRITE = 2;
031:
032:            private byte mode;
033:
034:            private int size;
035:
036:            private ObjectID rootID;
037:
038:            private byte[] chunk;
039:
040:            public DbCacheChunk() {
041:            }
042:
043:            /**
044:             * Fetch objects from the server.
045:             */
046:            public DbCacheChunk(ObjectID _rootID, int _size) {
047:                mode = MODE_READ;
048:                rootID = _rootID;
049:                size = _size;
050:            }
051:
052:            /**
053:             * Store objects in the server.
054:             */
055:            public DbCacheChunk(byte[] _chunk) {
056:                mode = MODE_WRITE;
057:                chunk = _chunk;
058:            }
059:
060:            public void perform(Transaction ta) throws Exception {
061:                env.logWriter.newEntry(this , "DbCacheChunk.perform(): mode:"
062:                        + mode, LogWriter.DEBUG);
063:
064:                switch (mode) {
065:                case MODE_READ:
066:                    readChunk(ta);
067:                    break;
068:                case MODE_WRITE:
069:                    writeChunk(ta);
070:                    break;
071:                default:
072:                    throw new RuntimeException("Unknown mode.");
073:                }
074:            }
075:
076:            protected void readChunk(Transaction ta) throws Exception {
077:                env.logWriter
078:                        .newEntry(this , "   readChunk()", LogWriter.DEBUG3);
079:
080:                DxBag bag = env.storeManager.clusterOfID(rootID);
081:
082:                result = new DxArrayBag();
083:
084:                DxIterator it = bag.iterator();
085:                ObjectID id = null;
086:                while ((id = (ObjectID) it.next()) != null) {
087:                    try {
088:                        env.logWriter.newEntry(this , "readChunk(): " + id,
089:                                LogWriter.DEBUG3);
090:                        ObjectContainer container = ta.acquireObjectAndPin(id,
091:                                Lock.LEVEL_READ);
092:
093:                        try {
094:                            // since the container link in the target is transient we can
095:                            // copy the target by just serializing it
096:                            CacheObjectContainer cc = new CacheObjectContainer(
097:                                    container);
098:
099:                            ((DxArrayBag) result).add(cc);
100:                        } finally {
101:                            container.unpin();
102:                        }
103:                    } catch (OzoneRemoteExc e) {
104:                        env.logWriter.newEntry(this , "   readChunk(): "
105:                                + e.toString(), LogWriter.DEBUG3);
106:                        // we don't handle ObjectNotFoundExc and such things here
107:                        continue;
108:                    }
109:                }
110:            }
111:
112:            protected void writeChunk(Transaction ta) throws Exception {
113:                env.logWriter.newEntry(this , "writeChunk(): size:"
114:                        + chunk.length, LogWriter.DEBUG3);
115:
116:                // writeChunk can use byte[] chunks because proxies always assume
117:                // that they are inside the server and so seting their link
118:                // correctly, this differs from readChunk()
119:
120:                ByteArrayInputStream bin = new ByteArrayInputStream(chunk);
121:                ObjectInputStream in = new ObjectInputStream(bin);
122:
123:                env.logWriter.newEntry(this , "   available:" + bin.available(),
124:                        LogWriter.DEBUG3);
125:                while (bin.available() > 0) {
126:                    CacheObjectContainer cacheContainer = (CacheObjectContainer) in
127:                            .readObject();
128:                    env.logWriter.newEntry(this , "   container: id:"
129:                            + cacheContainer.id() + " state:"
130:                            + cacheContainer.state(), LogWriter.DEBUG3);
131:
132:                    if (cacheContainer.state() == ObjectContainer.STATE_CREATED) {
133:                        ObjectContainer container = ta.createObjectAndPin(null,
134:                                cacheContainer.access(), cacheContainer.name(),
135:                                null, null, cacheContainer.id());
136:                        try {
137:                            container.setTarget(cacheContainer.target());
138:                        } finally {
139:                            container.unpin();
140:                        }
141:                    } else {
142:                        // this throws an exception if the container has been deleted already
143:                        ObjectContainer container = ta.acquireObjectAndPin(
144:                                cacheContainer.id(), Lock.LEVEL_WRITE);
145:
146:                        // check the optimistic lock
147:                        if (container.modTime() > cacheContainer.modTime()) {
148:                            throw new TransactionExc(
149:                                    "Object has been changed by another transaction.",
150:                                    TransactionExc.OPTIMISTIC);
151:                        }
152:
153:                        if (cacheContainer.state() == ObjectContainer.STATE_DELETED) {
154:                            ta.deleteObject(container.id());
155:                        } else if (cacheContainer.state() == ObjectContainer.STATE_MODIFIED) {
156:                            container.setTarget(cacheContainer.target());
157:
158:                            // do nothing if the names are the same
159:                            String name = cacheContainer.name();
160:                            // if (!(container.name() == null && name == null || container.name().equals (name)))
161:                            container.nameTarget(name);
162:                        } else {
163:                            throw new RuntimeException(
164:                                    "Wrong container state: "
165:                                            + container.state());
166:                        }
167:                    }
168:                }
169:            }
170:
171:            /**
172:             * Recursivly search the specified object and put all found OzoneProxies
173:             * in the specified deque.
174:             */
175:            protected void findProxies(Object obj, DxDeque deque) {
176:                String name = obj != null ? obj.getClass().getName() : "(null)";
177:                System.out.println("*** findProxies(): " + name);
178:
179:                if (obj == null) {
180:                    // do nothing
181:                } else if (obj instanceof  OzoneProxy) {
182:                    deque.pushTop(((OzoneProxy) obj).remoteID());
183:                } else {
184:                    Class cl = obj.getClass();
185:                    int mdf = cl.getModifiers();
186:                    if (Modifier.isTransient(mdf) || Modifier.isStatic(mdf)
187:                            || Modifier.isFinal(mdf)) {
188:                        // do nothing
189:                        System.out.println("***    transient/static/final"
190:                                + name);
191:                    } else if (cl.isPrimitive()) {
192:                        // do nothing
193:                        System.out.println("***    primitive" + name);
194:                    } else if (cl.isArray()) {
195:                        System.out.println("***    array" + name);
196:                        int len = Array.getLength(obj);
197:                        for (int j = 0; j < len; j++) {
198:                            Object member = Array.get(obj, j);
199:                            findProxies(member, deque);
200:                        }
201:                    } else {
202:                        Field[] fields = cl.getFields();
203:                        for (int i = 0; i < fields.length; i++) {
204:                            try {
205:                                System.out.println("***    "
206:                                        + fields[i].toString());
207:                                Object member = fields[i].get(obj);
208:                                findProxies(member, deque);
209:                            } catch (Exception e) {
210:                                // should never happen
211:                                System.out.println("***    exception" + name);
212:                            }
213:                        }
214:                    }
215:                }
216:            }
217:
218:            public void writeExternal(ObjectOutput out) throws IOException {
219:                out.writeByte(mode);
220:                switch (mode) {
221:                case MODE_WRITE: {
222:                    out.writeObject(chunk);
223:                    break;
224:                }
225:                case MODE_READ: {
226:                    out.writeInt(size);
227:                    out.writeObject(rootID);
228:                    break;
229:                }
230:                default:
231:                    throw new RuntimeException("Unknown mode.");
232:                }
233:            }
234:
235:            public synchronized void readExternal(ObjectInput in)
236:                    throws IOException, ClassNotFoundException {
237:                mode = in.readByte();
238:                switch (mode) {
239:                case MODE_WRITE: {
240:                    chunk = (byte[]) in.readObject();
241:                    break;
242:                }
243:                case MODE_READ: {
244:                    size = in.readInt();
245:                    rootID = (ObjectID) in.readObject();
246:                    break;
247:                }
248:                default:
249:                    throw new RuntimeException("Unknown mode.");
250:                }
251:            }
252:
253:        }
254:
255:        /**
256:         * @author <a href="http://www.softwarebuero.de/">SMB</a>
257:         * @version $Revision: 1.2 $Date: 2002/06/08 00:49:38 $
258:         */
259:        final class RObjectOutputStream extends ObjectOutputStream {
260:
261:            private DxDeque deque;
262:
263:            public RObjectOutputStream(OutputStream out, DxDeque _deque)
264:                    throws IOException {
265:                super (out);
266:                deque = _deque;
267:
268:                System.out.println(getClass().getClassLoader());
269:                enableReplaceObject(true);
270:            }
271:
272:            protected Object replaceObject(Object obj) throws IOException {
273:                String name = obj != null ? obj.getClass().getName() : "(null)";
274:                System.out.println("*** replaceObject():" + name);
275:
276:                if (obj instanceof  OzoneProxy) {
277:                    System.out.println("***    proxy!");
278:                    deque.pushTop(((OzoneProxy) obj).remoteID());
279:                }
280:
281:                return obj;
282:            }
283:
284:        }
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