SerialExecutor.java

package com.ved.musicmapapp.utils;

import java.util.LinkedHashMap;
import java.util.Map;
import java.util.concurrent.Executor;

public class SerialExecutor  {
	private Executor mExecutor;
	private Map<String, Runnable> mRunables;
	
	public SerialExecutor(Executor executor) {
		mExecutor = executor;
		mRunables = new LinkedHashMap<String, Runnable>();
	}
	
	public void execute(String key, Runnable runable){
		if(!mRunables.containsKey(key)){
			mRunables.put(key, runable);
			mExecutor.execute(runable);
		}
	}
}