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Schedule a Task for Future Execution
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Classes javautilTimer javautilTimerTask Methods void cancel( ) void schedule(TimerTask TTask, long wait, long repeat) void run( )
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In javautil are two classes that serve a very useful purpose: they let you schedule a task for future execution The classes are Timer and TimerTask They work together, with TimerTask defining the task to execute and Timer providing the scheduling Once started, the task waits in the background until the specified execution time arrives At that point, the task is executed It is also possible to schedule a task for repeated execution This recipe shows how to put Timer and TimerTask into action
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NOTE In javaxswing, Swing also defines a class called Timer It serves a different purpose than
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does javautilTimer, and it is important not to confuse the two For recipes that use Swing, see 8 For general-purpose recipes that use multithreading, see 7
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To schedule a task for future execution involves these steps: 1 Create a class that encapsulates the task to be scheduled by extending TimerTask 2 Create an instance of the TimerTask 3 Create a Timer instance that will be used to schedule the task 4 Schedule the task by calling schedule( ) on the Timer instance You can schedule either a single or repeated execution of the task 5 Stop the Timer by calling cancel( )
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Discussion
To create a task that can be executed by Timer, you must create an instance of TimerTask TimerTask is an abstract class that implements the Runnable interface You will extend it to create the class that encapsulates your task TimerTask defines three methods, but the only one used by this recipe is run( ), which is specified by the Runnable interface It is shown here: abstract void run( ) Notice that run( ) is abstract This means that it must be overridden by the extending class In run( ) you will put the code that constitutes the task to be executed To schedule a task for future execution, you must first create an instance of Timer and then call schedule( ) on that object There are several versions of schedule( ) The one used by this recipe is shown here: void schedule(TimerTask TTask, long wait, long repeat) The task to schedule is passed in TTask This must be an instance of the TimerTask class that you created, as just described The number of milliseconds to wait before the task is executed is passed in wait When the delay period expires, the run( ) method of TTask is executed The number of milliseconds to wait between repetitions is passed in repeat You can stop a Timer by calling cancel( ), shown next: void cancel( ) Once stopped, a timer cannot be restarted If any task is currently executing, it will be allowed to finish
Herb Schildt s Java Prog ramming Cookbook
Example
The following example shows Timer and TimerTask in action It creates a class called AutoBkUp that automatically copies a file every two seconds Of course, this short period is for demonstration purposes only A longer period is probably more useful Notice the field success This field is initially set to false If the copy operation succeeds, then success is set to true Otherwise, it is set to false You can obtain the success or failure status of the last backup by calling the accessor method isSuccessful( ) It returns the value of success
// Schedule a task by using Timer and TimerTask import javautil*; import javaio*; // This class automatically backs up a file // whenever its run() method is executed class AutoBkUp extends TimerTask { private String bkupName; private String fName; private boolean success; AutoBkUp(String fn, String bk) { fName = fn; bkupName = bk; success = false; } // Create a backup copy of a file // If an IO error occurs, this method sets the // "success" variable to false, attempts to close // open files, and resets the streams to null // It then tries again on the next repetition // However, in some applications, it might be // better to terminate the scheduler on failure public void run() { FileInputStream fin = null; FileOutputStream fout = null; int len; byte b[] = new byte[1024]; try { // Open the files fin = new FileInputStream(fName); fout = new FileOutputStream(bkupName); // Copy the file for(;;) { len = finread(b); if(len == -1) break; else foutwrite(b, 0, len); } success = true;
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