core-shared/src/main/java/org/apache/directory/server/core/shared/txn/TxnManagerFactory.java

/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 *
 */
package org.apache.directory.server.core.shared.txn;


import java.io.IOException;

import org.apache.directory.server.core.api.log.InvalidLogException;
import org.apache.directory.server.core.api.log.Log;
import org.apache.directory.server.core.api.txn.TxnLogManager;
import org.apache.directory.server.core.api.txn.TxnManager;
import org.apache.directory.server.core.shared.log.DefaultLog;


/**
 * 
 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
 */
public class TxnManagerFactory
{
    /** The only txn manager */
    private TxnManagerInternal txnManager;

    /** The only txn log manager */
    private TxnLogManagerInternal txnLogManager;
    
    /** WAL */
    private Log log;

    /** log suffix */
    private String LOG_SUFFIX = "log";

    private boolean inited;
    
    
    private String logFolderPath;
    
    private int logBufferSize;
    
    private long logFileSize;


    /**
     * 
     * Initializes the txn managemenet layer. It creates the only instances of txn manager and txn log manager. 
     *
     * @param logFolderPath log folder path for the log manager.
     * @param logBufferSize in memory buffer size for the log manager.
     * @param logFileSize max targer log file size for the log manager.
     * @throws IOException thrown if initialization fails.
     */
    public TxnManagerFactory( String logFolderPath,
        int logBufferSize, long logFileSize ) throws IOException
    {
    	this.logFolderPath = logFolderPath;
    	this.logBufferSize = logBufferSize;
    	this.logFileSize = logFileSize;
    	
        log = new DefaultLog();

        txnManager = new DefaultTxnManager();

        txnLogManager = new DefaultTxnLogManager( log, this );
        
        this.init();
    }
    
    
    public void init() throws IOException
    {
    	if ( inited )
    	{
    		return;
    	}
    	
    	try
    	{
    		log.init( logFolderPath, LOG_SUFFIX, logBufferSize, logFileSize );
        }	
        catch ( InvalidLogException e )
        {
        	throw new IOException( e );
        }	
    	
    	( ( DefaultTxnManager ) txnManager ).init(txnLogManager);
    	 
    	inited = true;
    }


    public void shutdown()
    {
        if ( inited == false )
        {
            return;
        }

        ( ( DefaultTxnManager ) txnManager ).shutdown();
        ( ( DefaultTxnLogManager ) txnLogManager ).shutdown();
        inited = false;
    }


    public TxnManager txnManagerInstance()
    {
        return txnManager;
    }


    public TxnLogManager txnLogManagerInstance()
    {
        return txnLogManager;
    }


    TxnManagerInternal txnManagerInternalInstance()
    {
        return txnManager;
    }
}