Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import java.util.*;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;

public class Main {
    static Map<Object, Executor> obj2exec = new HashMap<Object, Executor>();

    /**
     *   Gets the primary executor for a given object key
     *   Creates a new exector if didn't exist before
     *   Currently returns  an Executor that uses a single worker thread operating off an unbounded queue
     *      therefore tasks (Runnables added via exec.execute()) on the Executor are guaranteed to 
     *      execute sequentially in order, and no more than one task will be active at any given time
     */
    public synchronized static Executor getPrimaryExecutor(Object key) {
        Executor exec = obj2exec.get(key);
        if (exec == null) {
            exec = Executors.newSingleThreadExecutor();
            obj2exec.put(key, exec);
        }
        return exec;
    }
}