Source Code Cross Referenced for GigaSpaceFileIndexOutput.java in  » Search-Engine » compass-2.0 » org » compass » needle » gigaspaces » store » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Search Engine » compass 2.0 » org.compass.needle.gigaspaces.store 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2004-2006 the original author or authors.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.compass.needle.gigaspaces.store;
018:
019:        import java.io.File;
020:        import java.io.IOException;
021:        import java.io.RandomAccessFile;
022:
023:        import net.jini.core.lease.Lease;
024:        import org.apache.lucene.store.BufferedIndexOutput;
025:
026:        /**
027:         * Writes the output to a file and then when closed will flush it to the Space.
028:         *
029:         * <p>Not optimial, but allows for random seeking outside of just the first bucket.
030:         * Not used since Lucene only seeks to the first buffer (with proper bucket size).
031:         *
032:         * @author kimchy
033:         */
034:        class GigaSpaceFileIndexOutput extends BufferedIndexOutput {
035:
036:            private GigaSpaceDirectory dir;
037:
038:            private File tempFile;
039:
040:            private RandomAccessFile file = null;
041:
042:            private String fileName;
043:
044:            // remember if the file is open, so that we don't try to close it
045:            // more than once
046:            private boolean isOpen;
047:
048:            public GigaSpaceFileIndexOutput(GigaSpaceDirectory dir,
049:                    String fileName) throws IOException {
050:                this .dir = dir;
051:                this .fileName = fileName;
052:                tempFile = File.createTempFile(dir.getIndexName() + "_"
053:                        + fileName + "_" + System.currentTimeMillis(),
054:                        ".lucene-gigaspacesdir");
055:                this .file = new RandomAccessFile(tempFile, "rw");
056:                isOpen = true;
057:            }
058:
059:            /**
060:             * output methods:
061:             */
062:            public void flushBuffer(byte[] b, int offset, int size)
063:                    throws IOException {
064:                file.write(b, offset, size);
065:            }
066:
067:            public void close() throws IOException {
068:                // only close the file if it has not been closed yet
069:                if (isOpen) {
070:                    super .close();
071:
072:                    // this file is overridden by Lucene, so delete it first
073:                    if (fileName.equals("segments.gen")) {
074:                        dir.deleteFile(fileName);
075:                    }
076:
077:                    // go over the file and write it to the space
078:                    file.seek(0);
079:                    byte[] buffer = new byte[dir.getBucketSize()];
080:
081:                    // TODO consider using transactions to wrap all the writes
082:                    int offset = 0;
083:                    int length = dir.getBucketSize();
084:                    long bucketIndex = 0;
085:                    while (true) {
086:                        int sizeRead = file.read(buffer, offset, length);
087:                        if (sizeRead == -1) {
088:                            flushBucket(bucketIndex, buffer, offset);
089:                            break;
090:                        }
091:                        offset += sizeRead;
092:                        length -= sizeRead;
093:                        if (length <= 0) {
094:                            flushBucket(bucketIndex++, buffer, dir
095:                                    .getBucketSize());
096:                            offset = 0;
097:                            length = dir.getBucketSize();
098:                        }
099:                    }
100:                    try {
101:                        dir.getSpace().write(
102:                                new FileEntry(dir.getIndexName(), fileName,
103:                                        file.length()), null, Lease.FOREVER);
104:                    } catch (Exception e) {
105:                        throw new GigaSpaceDirectoryException(dir
106:                                .getIndexName(), fileName,
107:                                "Failed to write file entry", e);
108:                    }
109:                    file.close();
110:                    tempFile.delete();
111:                    isOpen = false;
112:                }
113:            }
114:
115:            /**
116:             * Random-access methods
117:             */
118:            public void seek(long pos) throws IOException {
119:                super .seek(pos);
120:                file.seek(pos);
121:            }
122:
123:            public long length() throws IOException {
124:                return file.length();
125:            }
126:
127:            private void flushBucket(long bucketIndex, byte[] buffer, int length)
128:                    throws IOException {
129:                FileBucketEntry fileBucketEntry = new FileBucketEntry(dir
130:                        .getIndexName(), fileName, bucketIndex, null);
131:                fileBucketEntry.data = new byte[length];
132:                System.arraycopy(buffer, 0, fileBucketEntry.data, 0, length);
133:                try {
134:                    dir.getSpace().write(fileBucketEntry, null, Lease.FOREVER);
135:                } catch (Exception e) {
136:                    throw new GigaSpaceDirectoryException(dir.getIndexName(),
137:                            fileName, "Failed to write bucket [" + bucketIndex
138:                                    + "]", e);
139:                }
140:            }
141:        }
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