Source Code Cross Referenced for BlockFile.java in  » Database-DBMS » BlockFile » net » metanotion » io » block » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » BlockFile » net.metanotion.io.block 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:        Copyright (c) 2006, Matthew Estes
003:        All rights reserved.
004:
005:        Redistribution and use in source and binary forms, with or without
006:        modification, are permitted provided that the following conditions are met:
007:
008:         * Redistributions of source code must retain the above copyright
009:        notice, this list of conditions and the following disclaimer.
010:         * Redistributions in binary form must reproduce the above copyright
011:        notice, this list of conditions and the following disclaimer in the
012:        documentation and/or other materials provided with the distribution.
013:         * Neither the name of Metanotion Software nor the names of its
014:        contributors may be used to endorse or promote products derived from this
015:        software without specific prior written permission.
016:
017:        THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
018:        IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
019:        THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
020:        PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
021:        CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
022:        EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
023:        PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
024:        PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
025:        LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
026:        NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
027:        SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
028:         */
029:        package net.metanotion.io.block;
030:
031:        import java.io.File;
032:        import java.io.IOException;
033:        import java.io.RandomAccessFile;
034:        import java.util.HashMap;
035:        import java.util.Iterator;
036:        import java.util.Set;
037:
038:        import net.metanotion.io.RAIFile;
039:        import net.metanotion.io.RandomAccessInterface;
040:        import net.metanotion.io.Serializer;
041:        import net.metanotion.io.data.IntBytes;
042:        import net.metanotion.io.data.LongBytes;
043:        import net.metanotion.io.data.NullBytes;
044:        import net.metanotion.io.data.StringBytes;
045:
046:        import net.metanotion.io.block.index.BSkipList;
047:
048:        class CorruptFileException extends IOException {
049:        }
050:
051:        class BadFileFormatException extends IOException {
052:        }
053:
054:        class BadVersionException extends IOException {
055:        }
056:
057:        public class BlockFile {
058:            public static final long PAGESIZE = 1024;
059:            public static final long OFFSET_MOUNTED = 20;
060:
061:            public RandomAccessInterface file;
062:
063:            private long magicBytes = 0x3141deadbeef0100L;
064:            private long fileLen = PAGESIZE * 2;
065:            private int freeListStart = 0;
066:            private short mounted = 0;
067:            public short spanSize = 127;
068:
069:            private BSkipList metaIndex = null;
070:            private HashMap openIndices = new HashMap();
071:
072:            private void mount() throws IOException {
073:                file.seek(BlockFile.OFFSET_MOUNTED);
074:                mounted = 1;
075:                file.writeShort(mounted);
076:            }
077:
078:            private void writeSuperBlock() throws IOException {
079:                file.seek(0);
080:                file.writeLong(magicBytes);
081:                file.writeLong(fileLen);
082:                file.writeInt(freeListStart);
083:                file.writeShort(mounted);
084:                file.writeShort(spanSize);
085:            }
086:
087:            private void readSuperBlock() throws IOException {
088:                file.seek(0);
089:                magicBytes = file.readLong();
090:                fileLen = file.readLong();
091:                freeListStart = file.readInt();
092:                mounted = file.readShort();
093:                spanSize = file.readShort();
094:            }
095:
096:            public static void main(String args[]) {
097:                try {
098:                    RAIFile raif = new RAIFile(new File(args[0]), true, true);
099:                    BlockFile bf = new BlockFile(raif, true);
100:
101:                    //bf.metaIndex.delete();
102:                    bf.makeIndex("foo", new NullBytes(), new NullBytes());
103:
104:                    BSkipList b = bf.getIndex("foo", new NullBytes(),
105:                            new NullBytes());
106:                    System.out.println(bf.allocPage());
107:
108:                    bf.close();
109:                    raif.close();
110:                } catch (Exception e) {
111:                    e.printStackTrace();
112:                }
113:            }
114:
115:            public int writeMultiPageData(byte[] data, int page,
116:                    int[] curPageOff, int[] nextPage) throws IOException {
117:                int pageCounter = curPageOff[0];
118:                int curNextPage = nextPage[0];
119:                int curPage = page;
120:                int dct = 0;
121:                while (dct < data.length) {
122:                    int len = ((int) BlockFile.PAGESIZE) - pageCounter;
123:                    if (len <= 0) {
124:                        if (curNextPage == 0) {
125:                            curNextPage = this .allocPage();
126:                            BlockFile.pageSeek(this .file, curNextPage);
127:                            this .file.writeInt(0);
128:                            BlockFile.pageSeek(this .file, curPage);
129:                            this .file.writeInt(curNextPage);
130:                        }
131:                        BlockFile.pageSeek(this .file, curNextPage);
132:                        curPage = curNextPage;
133:                        curNextPage = this .file.readInt();
134:                        pageCounter = 4;
135:                        len = ((int) BlockFile.PAGESIZE) - pageCounter;
136:                    }
137:                    this .file
138:                            .write(data, dct, Math.min(len, data.length - dct));
139:                    pageCounter += Math.min(len, data.length - dct);
140:                    dct += Math.min(len, data.length - dct);
141:                }
142:                nextPage[0] = curNextPage;
143:                curPageOff[0] = pageCounter;
144:                return curPage;
145:            }
146:
147:            public int readMultiPageData(byte[] arr, int page,
148:                    int[] curPageOff, int[] nextPage) throws IOException {
149:                int pageCounter = curPageOff[0];
150:                int curNextPage = nextPage[0];
151:                int curPage = page;
152:                int dct = 0;
153:                int res;
154:                while (dct < arr.length) {
155:                    int len = ((int) BlockFile.PAGESIZE) - pageCounter;
156:                    if (len <= 0) {
157:                        BlockFile.pageSeek(this .file, curNextPage);
158:                        curPage = curNextPage;
159:                        curNextPage = this .file.readInt();
160:                        pageCounter = 4;
161:                        len = ((int) BlockFile.PAGESIZE) - pageCounter;
162:                    }
163:                    res = this .file.read(arr, dct, Math.min(len, arr.length
164:                            - dct));
165:                    if (res == -1) {
166:                        throw new IOException();
167:                    }
168:                    pageCounter += Math.min(len, arr.length - dct);
169:                    dct += res;
170:                }
171:                nextPage[0] = curNextPage;
172:                curPageOff[0] = pageCounter;
173:                return curPage;
174:            }
175:
176:            public BlockFile(RandomAccessInterface rai) throws IOException {
177:                this (rai, false);
178:            }
179:
180:            public BlockFile(RandomAccessFile raf) throws IOException {
181:                this (new RAIFile(raf), false);
182:            }
183:
184:            public BlockFile(RandomAccessFile raf, boolean init)
185:                    throws IOException {
186:                this (new RAIFile(raf), init);
187:            }
188:
189:            public BlockFile(File f, boolean init) throws IOException {
190:                this (new RAIFile(f, true, true), init);
191:            }
192:
193:            public BlockFile(RandomAccessInterface rai, boolean init)
194:                    throws IOException {
195:                if (rai == null) {
196:                    throw new NullPointerException();
197:                }
198:
199:                file = rai;
200:
201:                if (init) {
202:                    file.setLength(fileLen);
203:                    writeSuperBlock();
204:                    BSkipList.init(this , 2, spanSize);
205:                }
206:
207:                readSuperBlock();
208:                if (magicBytes != 0x3141deadbeef0100L) {
209:                    if ((magicBytes & 0x3141deadbeef0000L) == 0x3141deadbeef0000L) {
210:                        throw new BadVersionException();
211:                    } else {
212:                        throw new BadFileFormatException();
213:                    }
214:                }
215:                //		if(mounted != 0) { throw new CorruptFileException(); }
216:                if (fileLen != file.length()) {
217:                    throw new CorruptFileException();
218:                }
219:                mount();
220:
221:                metaIndex = new BSkipList(spanSize, this , 2, new StringBytes(),
222:                        new IntBytes());
223:            }
224:
225:            public static void pageSeek(RandomAccessInterface file, int page)
226:                    throws IOException {
227:                file.seek((((long) page) - 1L) * BlockFile.PAGESIZE);
228:            }
229:
230:            public int allocPage() throws IOException {
231:                if (freeListStart != 0) {
232:                    FreeListBlock flb = new FreeListBlock(file, freeListStart);
233:                    if (flb.len > 0) {
234:                        flb.len = flb.len - 1;
235:                        int page = flb.branches[flb.len];
236:                        flb.writeBlock();
237:                        return page;
238:                    } else {
239:                        freeListStart = flb.nextPage;
240:                        writeSuperBlock();
241:                        return flb.page;
242:                    }
243:                }
244:                long offset = file.length();
245:                fileLen = offset + BlockFile.PAGESIZE;
246:                file.setLength(fileLen);
247:                writeSuperBlock();
248:                return ((int) ((long) (offset / BlockFile.PAGESIZE))) + 1;
249:            }
250:
251:            public void freePage(int page) throws IOException {
252:                System.out.println("Free Page " + page);
253:                if (freeListStart == 0) {
254:                    freeListStart = page;
255:                    FreeListBlock.initPage(file, page);
256:                    writeSuperBlock();
257:                    return;
258:                }
259:                FreeListBlock flb = new FreeListBlock(file, freeListStart);
260:                if (flb.isFull()) {
261:                    FreeListBlock.initPage(file, page);
262:                    if (flb.nextPage == 0) {
263:                        flb.nextPage = page;
264:                        flb.writeBlock();
265:                        return;
266:                    } else {
267:                        flb = new FreeListBlock(file, page);
268:                        flb.nextPage = freeListStart;
269:                        flb.writeBlock();
270:                        freeListStart = page;
271:                        writeSuperBlock();
272:                        return;
273:                    }
274:                }
275:                flb.addPage(page);
276:                flb.writeBlock();
277:            }
278:
279:            public BSkipList getIndex(String name, Serializer key,
280:                    Serializer val) throws IOException {
281:                Integer page = (Integer) metaIndex.get(name);
282:                if (page == null) {
283:                    return null;
284:                }
285:                BSkipList bsl = new BSkipList(spanSize, this , page.intValue(),
286:                        key, val);
287:                openIndices.put(name, bsl);
288:                return bsl;
289:            }
290:
291:            public BSkipList makeIndex(String name, Serializer key,
292:                    Serializer val) throws IOException {
293:                if (metaIndex.get(name) != null) {
294:                    throw new IOException("Index already exists");
295:                }
296:                int page = allocPage();
297:                metaIndex.put(name, new Integer(page));
298:                BSkipList.init(this , page, spanSize);
299:                BSkipList bsl = new BSkipList(spanSize, this , page, key, val);
300:                openIndices.put(name, bsl);
301:                return bsl;
302:            }
303:
304:            public void delIndex(String name) throws IOException {
305:                Integer page = (Integer) metaIndex.remove(name);
306:                if (page == null) {
307:                    return;
308:                }
309:                NullBytes nb = new NullBytes();
310:                BSkipList bsl = new BSkipList(spanSize, this , page.intValue(),
311:                        nb, nb);
312:                bsl.delete();
313:            }
314:
315:            public void close() throws IOException {
316:                metaIndex.close();
317:                metaIndex = null;
318:
319:                Set oi = openIndices.keySet();
320:                Iterator i = oi.iterator();
321:                Object k;
322:                while (i.hasNext()) {
323:                    k = i.next();
324:                    BSkipList bsl = (BSkipList) openIndices.get(k);
325:                    bsl.close();
326:                }
327:
328:                // Unmount.
329:                file.seek(BlockFile.OFFSET_MOUNTED);
330:                file.writeShort(0);
331:            }
332:        }
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