Source Code Cross Referenced for StorageRandomAccessFile.java in  » Database-DBMS » db-derby-10.2 » org » apache » derby » io » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derby.io 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:
003:           Derby - Class org.apache.derby.io.StorageRandomAccessFile
004:
005:           Licensed to the Apache Software Foundation (ASF) under one or more
006:           contributor license agreements.  See the NOTICE file distributed with
007:           this work for additional information regarding copyright ownership.
008:           The ASF licenses this file to You under the Apache License, Version 2.0
009:           (the "License"); you may not use this file except in compliance with
010:           the License.  You may obtain a copy of the License at
011:
012:              http://www.apache.org/licenses/LICENSE-2.0
013:
014:           Unless required by applicable law or agreed to in writing, software
015:           distributed under the License is distributed on an "AS IS" BASIS,
016:           WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017:           See the License for the specific language governing permissions and
018:           limitations under the License.
019:
020:         */
021:
022:        package org.apache.derby.io;
023:
024:        import java.io.DataInput;
025:        import java.io.DataOutput;
026:        import java.io.FileNotFoundException;
027:        import java.io.EOFException;
028:        import java.io.IOException;
029:
030:        /**
031:         * This interface abstracts an object that implements reading and writing on a random access
032:         * file. It extends DataInput and DataOutput, so it implicitly contains all the methods of those
033:         * interfaces. Any method in this interface that also appears in the java.io.RandomAccessFile class
034:         * should behave as the java.io.RandomAccessFile method does.
035:         *<p>
036:         * Each StorageRandomAccessFile has an associated file pointer, a byte offset in the file. All reading and writing takes
037:         * place at the file pointer offset and advances it.
038:         *<p>
039:         * An implementation of StorageRandomAccessFile need not be thread safe. The database engine
040:         * single-threads access to each StorageRandomAccessFile instance. Two threads will not access the
041:         * same StorageRandomAccessFile instance at the same time.
042:         *<p>
043:         * @see <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/io/RandomAccessFile.html">java.io.RandomAccessFile</a>
044:         */
045:        public interface StorageRandomAccessFile extends DataInput, DataOutput {
046:
047:            /**
048:             * Closes this file.
049:             *
050:             * @exception IOException - if an I/O error occurs.
051:             */
052:            public void close() throws IOException;
053:
054:            /**
055:             * Get the current offset in this file.
056:             *
057:             * @return the current file pointer. 
058:             *
059:             * @exception IOException - if an I/O error occurs.
060:             */
061:            public long getFilePointer() throws IOException;
062:
063:            /**
064:             * Gets the length of this file.
065:             *
066:             * @return the number of bytes this file. 
067:             *
068:             * @exception IOException - if an I/O error occurs.
069:             */
070:            public long length() throws IOException;
071:
072:            /**
073:             * Set the file pointer. It may be moved beyond the end of the file, but this does not change
074:             * the length of the file. The length of the file is not changed until data is actually written..
075:             *
076:             * @param newFilePointer the new file pointer, measured in bytes from the beginning of the file.
077:             *
078:             * @exception IOException - if newFilePointer is less than 0 or an I/O error occurs.
079:             */
080:            public void seek(long newFilePointer) throws IOException;
081:
082:            /**
083:             * Sets the length of this file, either extending or truncating it.
084:             *<p>
085:             * If the file is extended then the contents of the extension are not defined.
086:             *<p>
087:             * If the file is truncated and the file pointer is greater than the new length then the file pointer
088:             * is set to the new length.
089:             *
090:             * @param newLength The new file length.
091:             *
092:             * @exception IOException If an I/O error occurs.
093:             */
094:            public void setLength(long newLength) throws IOException;
095:
096:            /**
097:             * Force any changes out to the persistent store. If the database is to be transient, that is, if the database
098:             * does not survive a restart, then the sync method implementation need not do anything.
099:             *
100:             * @param metaData If true then this method must force both changes to the file's
101:             *          contents and metadata to be written to storage; if false, it need only force file content changes
102:             *          to be written. The implementation is allowed to ignore this parameter and always force out
103:             *          metadata changes.
104:             *
105:             * @exception SyncFailedException if a possibly recoverable error occurs.
106:             * @exception IOException If an IO error occurs.
107:             */
108:            public void sync(boolean metaData) throws IOException;
109:        }
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