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So far in this chapter, we have discussed various ways of scheduling jobs to be executed at a specific point in time, at defined intervals, or using a combination of both times and intervals. Now, we are going to look at another way to schedule jobs in Spring that depend less on a specific time or interval than on immediate or event-triggered execution. For example, think of a web server handling incoming requests. A simple approach for building such a server application would be to process each job in a new thread. Depending on the server you are building and its environment, this might work absolutely fine. But as the creation of a thread needs time and system resources, you might end up spending more time creating and destroying threads than executing jobs, not to mention that you might run out of system resources. To run stably, a server needs some way of managing how much can be done at the same time. The concept of thread pools and work queue offers just this.

One welcome addition to Java 5 was the java.util.concurrent package based on Doug Lea s util.concurrent package, a library offering efficient and well-tested tools to simplify the development of multithreaded applications. This package provides the Executor interface, which defines only one method execute(Runnable command) to execute Runnable tasks. It abstracts the submission of tasks away from the details of how they are run. Implementations of this interface offer all sorts of execution policy: thread-per-task, thread pooling, or even synchronous execution just to name a few (you can find some implementations of these in the Javadoc for the Executor interface). To give you a little example of how this interface and its subinterface ExecutorService can be used, we will first create a task to execute using a slightly amended version of our former HelloWorldTask from Listing 12-1. We could just as well use the HelloWorldTask straight away, as it extends TimerTask that implements Runnable, but we wouldn t be able to see the task scheduling differences between various Executor implementations. Listing 12-26. HelloWorldCountDownTask package com.apress.prospring2.ch12; public class HelloWorldCountDownTask implements Runnable { private String name; private int count = 4; public HelloWorldCountDownTask(String name) { this.name = name; } public void run() { while (count > 0) { count--; if (count == 0) { System.out.println(name + " says 'Hello World!"); } else { System.out.println(name + ": " + count); Thread.yield(); }

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As you can see in Table 7-1, the two instances of MSF differ in the work item sets they offer. MSF for CMMI has two more work item types than MSF for Agile. The information on the work items also differs a bit. When it comes to reports, there are also a lot of differences (see Figures 7-15 and 7-16).

} } } All this task does is print out a countdown from 3, calling the Thread.yield() method afterward to pause this thread s executions and allow other threads to be executed. As a last statement, the task will say hello to the world and finish execution. Next, as shown in Listing 12-27, we are going to use an ExecutorService implementation to schedule and execute this task. Listing 12-27. Use ExecutorService to Schedule and Execute a Task package com.apress.prospring2.ch12.executor; import com.apress.prospring2.ch12.HelloWorldCountDownTask; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; public class ExecutorServiceExample { public static void main(String[] args) { ExecutorService service = Executors.newFixedThreadPool(2); service.execute(new service.execute(new service.execute(new service.execute(new service.shutdown(); } } The java.util.concurrent.Executors class provides convenient factory and utility methods for Executor and ExecutorService classes. We are using its newFixedThreadPool() method to retrieve a ThreadPoolExecutor with a fixed number of two threads in the pool. We then submit four tasks to execution and call the ExecutorService s shutdown() method to shut down the ExecutorService after all tasks have been executed. After calling this method, no further tasks can be added to the service. Running this example will print out the following: Anna: 3 Anna: 2 Beth: 3 Anna: 1 Anna says 'Hello World! Charlie: 3 Beth: 2 Charlie: 2 Beth: 1 Charlie: 1 Beth says 'Hello World! Daniel: 3 Charlie says 'Hello World! Daniel: 2 Daniel: 1 Daniel says 'Hello World! HelloWorldCountDownTask("Anna")); HelloWorldCountDownTask("Beth")); HelloWorldCountDownTask("Charlie")); HelloWorldCountDownTask("Daniel"));

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