/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2006-2008 Sun Microsystems, Inc.
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*/
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package org.opends.server.backends.jeb;
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import com.sleepycat.je.*;
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import static org.opends.server.loggers.debug.DebugLogger.*;
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import org.opends.server.loggers.debug.DebugTracer;
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import org.opends.server.types.DebugLogLevel;
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/**
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* This class is a wrapper around the JE database object and provides basic
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* read and write methods for entries.
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*/
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public abstract class DatabaseContainer
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{
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/**
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* The tracer object for the debug logger.
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*/
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private static final DebugTracer TRACER = getTracer();
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/**
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* The database entryContainer.
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*/
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protected EntryContainer entryContainer;
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/**
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* The JE database configuration.
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*/
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protected DatabaseConfig dbConfig;
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/**
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* The name of the database within the entryContainer.
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*/
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protected String name;
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/**
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* The reference to the JE Environment.
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*/
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private Environment env;
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/**
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* A JE database handle opened through this database
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* container.
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*/
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private Database database;
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/**
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* Create a new DatabaseContainer object.
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*
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* @param name The name of the entry database.
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* @param env The JE Environment.
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* @param entryContainer The entryContainer of the entry database.
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* @throws DatabaseException if a JE database error occurs.
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*/
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protected DatabaseContainer(String name, Environment env,
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EntryContainer entryContainer)
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throws DatabaseException
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{
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this.env = env;
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this.entryContainer = entryContainer;
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this.name = name;
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}
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/**
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* Opens a JE database in this database container. If the provided
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* database configuration is transactional, a transaction will be
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* created and used to perform the open.
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*
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* @throws DatabaseException if a JE database error occurs while
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* openning the index.
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*/
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public void open() throws DatabaseException
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{
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if (dbConfig.getTransactional())
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{
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// Open the database under a transaction.
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Transaction txn =
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entryContainer.beginTransaction();
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try
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{
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database = env.openDatabase(txn, name, dbConfig);
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if (debugEnabled())
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{
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TRACER.debugVerbose("JE database %s opened. txnid=%d",
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database.getDatabaseName(),
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txn.getId());
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}
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entryContainer.transactionCommit(txn);
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}
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catch (DatabaseException e)
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{
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entryContainer.transactionAbort(txn);
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throw e;
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}
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}
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else
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{
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database = env.openDatabase(null, name, dbConfig);
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if (debugEnabled())
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{
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TRACER.debugVerbose("JE database %s opened. txnid=none",
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database.getDatabaseName());
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}
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}
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}
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/**
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* Flush any cached database information to disk and close the
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* database container.
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*
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* The database container should not be closed while other processes
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* aquired the container. The container should not be closed
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* while cursors handles into the database remain open, or
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* transactions that include operations on the database have not yet
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* been commited or aborted.
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*
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* The container may not be accessed again after this method is
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* called, regardless of the method's success or failure.
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*
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* @throws DatabaseException if an error occurs.
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*/
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synchronized void close() throws DatabaseException
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{
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if(dbConfig.getDeferredWrite())
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{
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database.sync();
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}
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database.close();
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database = null;
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if(debugEnabled())
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{
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TRACER.debugInfo("Closed database %s", name);
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}
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}
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/**
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* Replace or insert a record into a JE database, with optional debug logging.
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* This is a simple wrapper around the JE Database.put method.
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* @param txn The JE transaction handle, or null if none.
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* @param key The record key.
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* @param data The record value.
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* @return The operation status.
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* @throws DatabaseException If an error occurs in the JE operation.
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*/
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protected OperationStatus put(Transaction txn, DatabaseEntry key,
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DatabaseEntry data)
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throws DatabaseException
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{
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OperationStatus status = database.put(txn, key, data);
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if (debugEnabled())
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{
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TRACER.debugJEAccess(DebugLogLevel.VERBOSE, status, database,
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txn, key, data);
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}
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return status;
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}
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/**
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* Read a record from a JE database, with optional debug logging. This is a
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* simple wrapper around the JE Database.get method.
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* @param txn The JE transaction handle, or null if none.
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* @param key The key of the record to be read.
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* @param data The record value returned as output. Its byte array does not
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* need to be initialized by the caller.
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* @param lockMode The JE locking mode to be used for the read.
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* @return The operation status.
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* @throws DatabaseException If an error occurs in the JE operation.
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*/
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protected OperationStatus read(Transaction txn,
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DatabaseEntry key, DatabaseEntry data,
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LockMode lockMode)
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throws DatabaseException
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{
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OperationStatus status = database.get(txn, key, data, lockMode);
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if (debugEnabled())
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{
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TRACER.debugJEAccess(DebugLogLevel.VERBOSE, status, database, txn, key,
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data);
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}
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return status;
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}
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/**
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* Insert a record into a JE database, with optional debug logging. This is a
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* simple wrapper around the JE Database.putNoOverwrite method.
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* @param txn The JE transaction handle, or null if none.
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* @param key The record key.
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* @param data The record value.
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* @return The operation status.
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* @throws DatabaseException If an error occurs in the JE operation.
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*/
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protected OperationStatus insert(Transaction txn,
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DatabaseEntry key, DatabaseEntry data)
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throws DatabaseException
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{
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OperationStatus status = database.putNoOverwrite(txn, key, data);
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if (debugEnabled())
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{
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TRACER.debugJEAccess(DebugLogLevel.VERBOSE, status, database, txn, key,
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data);
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}
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return status;
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}
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/**
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* Delete a record from a JE database, with optional debug logging. This is a
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* simple wrapper around the JE Database.delete method.
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* @param txn The JE transaction handle, or null if none.
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* @param key The key of the record to be read.
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* @return The operation status.
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* @throws DatabaseException If an error occurs in the JE operation.
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*/
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protected OperationStatus delete(Transaction txn,
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DatabaseEntry key)
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throws DatabaseException
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{
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OperationStatus status = database.delete(txn, key);
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if (debugEnabled())
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{
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TRACER.debugJEAccess(DebugLogLevel.VERBOSE, status, database, txn,
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key, null);
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}
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return status;
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}
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/**
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* Open a JE cursor on the DN database.
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* @param txn A JE database transaction to be used by the cursor,
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* or null if none.
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* @param cursorConfig The JE cursor configuration.
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* @return A JE cursor.
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* @throws DatabaseException If an error occurs while attempting to open
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* the cursor.
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*/
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public Cursor openCursor(Transaction txn, CursorConfig cursorConfig)
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throws DatabaseException
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{
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return database.openCursor(txn, cursorConfig);
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}
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/**
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* Get the count of key/data pairs in the database in a JE database.
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* This is a simple wrapper around the JE Database.count method.
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* @return The count of key/data pairs in the database.
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* @throws DatabaseException If an error occurs in the JE operation.
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*/
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public long getRecordCount() throws DatabaseException
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{
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long count = database.count();
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if (debugEnabled())
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{
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TRACER.debugJEAccess(DebugLogLevel.VERBOSE, OperationStatus.SUCCESS,
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database, null, null, null);
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}
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return count;
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}
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/**
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* Get a string representation of this object.
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* @return return A string representation of this object.
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*/
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public String toString()
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{
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return name;
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}
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/**
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* Get the JE database name for this database container.
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*
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* @return JE database name for this database container.
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*/
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public String getName()
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{
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return name;
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}
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/**
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* Preload the database into cache.
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*
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* @param config The preload configuration.
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* @return Statistics about the preload process.
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* @throws DatabaseException If an JE database error occurs
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* during the preload.
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*/
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public PreloadStats preload(PreloadConfig config)
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throws DatabaseException
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{
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return database.preload(config);
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}
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/**
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* Set the JE database name to use for this container.
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*
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* @param name The database name to use for this container.
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*/
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void setName(String name)
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{
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this.name = name;
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}
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}
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