com.srotya.tau.nucleus.wal.DiskMemoryWAL Maven / Gradle / Ivy

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/**
 * Copyright 2016 Ambud Sharma
 * 
 * Licensed 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 com.srotya.tau.nucleus.wal;

import java.io.IOException;
import java.util.SortedMap;
import java.util.concurrent.ConcurrentSkipListMap;

import com.srotya.tau.nucleus.processor.AbstractProcessor;
import com.srotya.tau.wraith.Event;
import com.srotya.tau.wraith.EventFactory;

/**
 * @author ambudsharma
 *
 */
public class DiskMemoryWAL implements WAL {
	
	static int length = 1024*1024*1024;//;0x8FFFFFF; // 128 Mb
	private SortedMap offsetMap;
	@SuppressWarnings("unused")
	private String walDirectory;
//	private MappedByteBuffer wal;
//	private String transientDirectory;

	public DiskMemoryWAL() {
		offsetMap = new ConcurrentSkipListMap<>();
	}

	@Override
	public void start() throws Exception {
//		wal = new RandomAccessFile(new File(walDirectory+"/wal.bin"), "rw").getChannel().map(MapMode.READ_WRITE, 0, length);
	}

	@Override
	public void stop() throws Exception {
	}

	@Override
	public synchronized void writeEvent(Event event) throws IOException {
//		offsetMap.put(event.getEventId(), (long)wal.position());
//		byte[] id = event.getEventId().getBytes();
//		wal.writeInt(id.length);
//		wal.write(id);
//		wal.writeInt(event.length);
//		wal.write(event);
//		wal.putInt(id.length);
//		wal.put(id);
//		wal.putInt(event.getBody().length);
//		wal.put(event.getBody());
	}

	@Override
	public void ackEvent(Long eventId) throws IOException {
		offsetMap.remove(eventId);
	}

	@Override
	public Long getEarliestEventId() throws IOException {
		return offsetMap.firstKey();
	}

	@Override
	public void setPersistentDirectory(String persistentDirectory) {
		walDirectory = persistentDirectory;
	}

	@Override
	public void setTransientDirectory(String transientDirectory) {
//		this.transientDirectory = transientDirectory;
	}

	@Override
	public void setCallingProcessor(AbstractProcessor processor) {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void setEventFactory(EventFactory factory) {
		// TODO Auto-generated method stub
		
	}

}