Source Code Cross Referenced for ScaledRAFileNIO.java in  » Database-DBMS » hsql » org » hsqldb » persist » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » hsql » org.hsqldb.persist 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* Copyright (c) 2001-2005, The HSQL Development Group
002:         * All rights reserved.
003:         *
004:         * Redistribution and use in source and binary forms, with or without
005:         * modification, are permitted provided that the following conditions are met:
006:         *
007:         * Redistributions of source code must retain the above copyright notice, this
008:         * list of conditions and the following disclaimer.
009:         *
010:         * Redistributions in binary form must reproduce the above copyright notice,
011:         * this list of conditions and the following disclaimer in the documentation
012:         * and/or other materials provided with the distribution.
013:         *
014:         * Neither the name of the HSQL Development Group nor the names of its
015:         * contributors may be used to endorse or promote products derived from this
016:         * software without specific prior written permission.
017:         *
018:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
019:         * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
020:         * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
021:         * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
022:         * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
023:         * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
024:         * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025:         * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
026:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027:         * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028:         * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029:         */
030:
031:        package org.hsqldb.persist;
032:
033:        import java.io.IOException;
034:        import java.io.RandomAccessFile;
035:        import java.nio.MappedByteBuffer;
036:        import java.nio.channels.FileChannel;
037:
038:        import org.hsqldb.Database;
039:        import org.hsqldb.Trace;
040:        import org.hsqldb.lib.SimpleLog;
041:
042:        /**
043:         * New NIO version of ScaledRAFile. This class is used only for storing a CACHED
044:         * TABLE .data file and cannot be used for TEXT TABLE source files.
045:         *
046:         * Due to various issues with java.nio classes, this class will use a mapped
047:         * channel of fixed size. After reaching this size, the file and channel are
048:         * closed.
049:         *
050:         * @author fredt@users
051:         * @version  1.8.0.5
052:         * @since 1.8.0.5
053:         */
054:        class ScaledRAFileNIO implements  ScaledRAInterface {
055:
056:            private final boolean readOnly;
057:            private final long bufferLength;
058:            private RandomAccessFile file;
059:            private MappedByteBuffer buffer;
060:            private FileChannel channel;
061:            private boolean bufferModified;
062:            private SimpleLog appLog;
063:            private final static String JVM_ERROR = "JVM threw unsupported Exception";
064:
065:            ScaledRAFileNIO(Database database, String name, boolean readOnly,
066:                    int bufferLength) throws Throwable {
067:
068:                long fileLength;
069:
070:                if (bufferLength < 1 << 18) {
071:                    bufferLength = 1 << 18;
072:                }
073:
074:                try {
075:                    file = new RandomAccessFile(name, readOnly ? "r" : "rw");
076:                } catch (Throwable e) {
077:                    throw e;
078:                }
079:
080:                try {
081:                    fileLength = file.length();
082:                } catch (Throwable e) {
083:                    file.close();
084:
085:                    throw e;
086:                }
087:
088:                if (fileLength > ScaledRAFile.MAX_NIO_LENGTH) {
089:                    file.close();
090:
091:                    throw new IOException("length exceeds nio limit");
092:                }
093:
094:                if (bufferLength < fileLength) {
095:                    bufferLength = (int) fileLength;
096:                }
097:
098:                bufferLength = newNIOBufferSize(bufferLength);
099:
100:                if (readOnly) {
101:                    bufferLength = (int) fileLength;
102:                }
103:
104:                if (fileLength < bufferLength) {
105:                    try {
106:                        file.seek(bufferLength - 1);
107:                        file.writeByte(0);
108:                        file.getFD().sync();
109:                        file.close();
110:
111:                        file = new RandomAccessFile(name, readOnly ? "r" : "rw");
112:                    } catch (Throwable e) {
113:                        file.close();
114:
115:                        throw e;
116:                    }
117:                }
118:
119:                this .appLog = database.logger.appLog;
120:                this .readOnly = readOnly;
121:                this .bufferLength = bufferLength;
122:                this .channel = file.getChannel();
123:
124:                try {
125:                    buffer = channel.map(
126:                            readOnly ? FileChannel.MapMode.READ_ONLY
127:                                    : FileChannel.MapMode.READ_WRITE, 0,
128:                            bufferLength);
129:
130:                    Trace.printSystemOut("NIO file instance created. mode: "
131:                            + readOnly);
132:
133:                    if (!readOnly) {
134:                        long tempSize = bufferLength - fileLength;
135:
136:                        if (tempSize > 1 << 18) {
137:                            tempSize = 1 << 18;
138:                        }
139:
140:                        byte[] temp = new byte[(int) tempSize];
141:
142:                        try {
143:                            long pos = fileLength;
144:
145:                            for (; pos < bufferLength - tempSize; pos += tempSize) {
146:                                buffer.position((int) pos);
147:                                buffer.put(temp, 0, temp.length);
148:                            }
149:
150:                            buffer.position((int) pos);
151:                            buffer.put(temp, 0, (int) (bufferLength - pos));
152:                            buffer.force();
153:                        } catch (Throwable t) {
154:                            appLog.logContext(t, JVM_ERROR + " " + "length: "
155:                                    + bufferLength);
156:                        }
157:
158:                        buffer.position(0);
159:                    }
160:                } catch (Throwable e) {
161:                    Trace.printSystemOut("NIO constructor failed:  "
162:                            + bufferLength);
163:
164:                    buffer = null;
165:                    channel = null;
166:
167:                    file.close();
168:                    System.gc();
169:
170:                    throw e;
171:                }
172:            }
173:
174:            public long length() throws IOException {
175:
176:                try {
177:                    return file.length();
178:                } catch (IOException e) {
179:                    appLog.logContext(e, "nio");
180:
181:                    throw e;
182:                } catch (Throwable e) {
183:                    appLog.logContext(e, JVM_ERROR);
184:
185:                    throw new IOException(e.toString());
186:                }
187:            }
188:
189:            public void seek(long newPos) throws IOException {
190:
191:                try {
192:                    buffer.position((int) newPos);
193:                } catch (IllegalArgumentException e) {
194:                    appLog.logContext(e, "nio");
195:
196:                    throw new IOException(e.toString());
197:                } catch (Throwable e) {
198:                    appLog.logContext(e, JVM_ERROR);
199:
200:                    throw new IOException(e.toString());
201:                }
202:            }
203:
204:            public long getFilePointer() throws IOException {
205:
206:                try {
207:                    return buffer.position();
208:                } catch (Throwable e) {
209:                    appLog.logContext(e, JVM_ERROR);
210:
211:                    throw new IOException(e.toString());
212:                }
213:            }
214:
215:            public int read() throws IOException {
216:
217:                try {
218:                    return buffer.get();
219:                } catch (Throwable e) {
220:                    appLog.logContext(e, JVM_ERROR);
221:
222:                    throw new IOException(e.toString());
223:                }
224:            }
225:
226:            public void read(byte[] b, int offset, int length)
227:                    throws IOException {
228:
229:                try {
230:                    buffer.get(b, offset, length);
231:                } catch (Throwable e) {
232:                    appLog.logContext(e, JVM_ERROR);
233:
234:                    throw new IOException(e.toString());
235:                }
236:            }
237:
238:            public int readInt() throws IOException {
239:
240:                try {
241:                    return buffer.getInt();
242:                } catch (Throwable e) {
243:                    appLog.logContext(e, JVM_ERROR);
244:
245:                    throw new IOException(e.toString());
246:                }
247:            }
248:
249:            public long readLong() throws IOException {
250:
251:                try {
252:                    return buffer.getLong();
253:                } catch (Throwable e) {
254:                    appLog.logContext(e, JVM_ERROR);
255:
256:                    throw new IOException(e.toString());
257:                }
258:            }
259:
260:            public void write(byte[] b, int offset, int len) throws IOException {
261:
262:                try {
263:                    bufferModified = true;
264:
265:                    buffer.put(b, offset, len);
266:                } catch (Throwable e) {
267:                    appLog.logContext(e, JVM_ERROR);
268:
269:                    throw new IOException(e.toString());
270:                }
271:            }
272:
273:            public void writeInt(int i) throws IOException {
274:
275:                try {
276:                    bufferModified = true;
277:
278:                    buffer.putInt(i);
279:                } catch (Throwable e) {
280:                    appLog.logContext(e, JVM_ERROR);
281:
282:                    throw new IOException(e.toString());
283:                }
284:            }
285:
286:            public void writeLong(long i) throws IOException {
287:
288:                try {
289:                    bufferModified = true;
290:
291:                    buffer.putLong(i);
292:                } catch (Throwable e) {
293:                    appLog.logContext(e, JVM_ERROR);
294:
295:                    throw new IOException(e.toString());
296:                }
297:            }
298:
299:            public void close() throws IOException {
300:
301:                try {
302:                    Trace.printSystemOut("NIO close() start - fileLength = "
303:                            + bufferLength);
304:
305:                    if (buffer != null && bufferModified) {
306:                        try {
307:                            buffer.force();
308:                        } catch (Throwable t) {
309:                            try {
310:                                buffer.force();
311:                            } catch (Throwable t1) {
312:                                appLog.logContext(t, JVM_ERROR + " "
313:                                        + "length: " + bufferLength);
314:                            }
315:                        }
316:                    }
317:
318:                    buffer = null;
319:                    channel = null;
320:
321:                    file.close();
322:                    System.gc();
323:                } catch (Throwable e) {
324:                    appLog.logContext(e, "length: " + bufferLength);
325:
326:                    throw new IOException(e.toString());
327:                }
328:            }
329:
330:            public boolean isReadOnly() {
331:                return readOnly;
332:            }
333:
334:            public boolean wasNio() {
335:                return true;
336:            }
337:
338:            public boolean canAccess(int length) {
339:                return buffer.position() + length <= bufferLength;
340:            }
341:
342:            public boolean canSeek(long position) {
343:                return position <= bufferLength;
344:            }
345:
346:            public Database getDatabase() {
347:                return null;
348:            }
349:
350:            static int newNIOBufferSize(int newSize) {
351:
352:                int bufSize = 0;
353:
354:                for (int scale = 20; scale < 30; scale++) {
355:                    bufSize = 1 << scale;
356:
357:                    if (bufSize >= newSize) {
358:                        break;
359:                    }
360:                }
361:
362:                return bufSize;
363:            }
364:        }
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