Source Code Cross Referenced for GigaSpaceIndexInput.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.IOException;
020:
021:        import org.apache.lucene.store.IndexInput;
022:
023:        /**
024:         * An index input using the {@link org.compass.needle.gigaspaces.store.FileEntry} as the
025:         * "header" information and load buckets as needed.
026:         *
027:         * @author kimchy
028:         */
029:        class GigaSpaceIndexInput extends IndexInput {
030:
031:            private GigaSpaceDirectory dir;
032:
033:            private FileEntry fileEntry;
034:
035:            private long position;
036:
037:            private FileBucketEntry bucketEntry;
038:
039:            private int currentBucketPosition;
040:
041:            public GigaSpaceIndexInput(GigaSpaceDirectory dir,
042:                    FileEntry fileEntry) {
043:                this .dir = dir;
044:                this .fileEntry = fileEntry;
045:                this .bucketEntry = new FileBucketEntry(fileEntry.indexName,
046:                        fileEntry.fileName, -1, null);
047:            }
048:
049:            public void close() throws IOException {
050:            }
051:
052:            /**
053:             * Returns the current position in this file, where the next read will
054:             * occur.
055:             *
056:             * @see #seek(long)
057:             */
058:            public long getFilePointer() {
059:                return this .position;
060:            }
061:
062:            /**
063:             * The number of bytes in the file.
064:             */
065:            public long length() {
066:                return fileEntry.getSize();
067:            }
068:
069:            /**
070:             * Reads and returns a single byte.
071:             *
072:             * @see org.apache.lucene.store.IndexOutput#writeByte(byte)
073:             */
074:            public byte readByte() throws IOException {
075:                loadBucketIfNeeded();
076:                position++;
077:                return bucketEntry.data[currentBucketPosition++];
078:            }
079:
080:            /**
081:             * Reads a specified number of bytes into an array at the specified
082:             * offset.
083:             *
084:             * @param b      the array to read bytes into
085:             * @param offset the offset in the array to start storing bytes
086:             * @param len    the number of bytes to read
087:             * @see org.apache.lucene.store.IndexOutput#writeBytes(byte[],int)
088:             */
089:            public void readBytes(byte[] b, int offset, int len)
090:                    throws IOException {
091:                loadBucketIfNeeded();
092:                // if there is enough place to load at once
093:                if (len <= (dir.getBucketSize() - currentBucketPosition)) {
094:                    if (len > 0) {
095:                        System.arraycopy(bucketEntry.data,
096:                                currentBucketPosition, b, offset, len);
097:                    }
098:                    currentBucketPosition += len;
099:                    position += len;
100:                    return;
101:                }
102:
103:                // cycle through the reads
104:                while (true) {
105:                    int available = dir.getBucketSize() - currentBucketPosition;
106:                    int sizeToRead = (len <= available) ? len : available;
107:                    System.arraycopy(bucketEntry.data, currentBucketPosition,
108:                            b, offset, sizeToRead);
109:                    len -= sizeToRead;
110:                    offset += sizeToRead;
111:                    position += sizeToRead;
112:                    currentBucketPosition += sizeToRead;
113:                    // check if we read enough, if we did, bail
114:                    if (len <= 0) {
115:                        break;
116:                    }
117:                    loadBucketIfNeeded();
118:                }
119:            }
120:
121:            /**
122:             * Sets current position in this file, where the next read will occur.
123:             *
124:             * @see #getFilePointer()
125:             */
126:            public void seek(long pos) throws IOException {
127:                position = pos;
128:            }
129:
130:            private void loadBucketIfNeeded()
131:                    throws GigaSpaceDirectoryException {
132:                currentBucketPosition = (int) position % dir.getBucketSize();
133:                long bucketIndex = position / dir.getBucketSize();
134:                // check if we need to load the bucket
135:                if (bucketIndex == bucketEntry.bucketIndex) {
136:                    return;
137:                }
138:                // reuse the current bucket entry as the template
139:                bucketEntry.data = null;
140:                bucketEntry.bucketIndex = bucketIndex;
141:                try {
142:                    bucketEntry = (FileBucketEntry) dir.getSpace().read(
143:                            bucketEntry, null, 0);
144:                } catch (Exception e) {
145:                    throw new GigaSpaceDirectoryException(fileEntry.indexName,
146:                            fileEntry.fileName, "Failed to read bucket ["
147:                                    + bucketIndex + "]", e);
148:                }
149:                if (bucketEntry == null) {
150:                    throw new GigaSpaceDirectoryException(fileEntry.indexName,
151:                            fileEntry.fileName, "Bucket [" + bucketIndex
152:                                    + "] not found");
153:                }
154:            }
155:        }
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