Java delayqueue deferred queue 21.7.3-------thinking Java 4

Package Org.rui.thread.newc;import Java.util.arraylist;import Java.util.list;import java.util.random;import Java.util.concurrent.delayqueue;import Java.util.concurrent.delayed;import Java.util.concurrent.ExecutorService; Import Java.util.concurrent.executors;import java.util.concurrent.timeunit;/** * A variant of the deferred queue priority queue * * @author Lenovo * * * * Class Delayedtask implements Runnable, delayed{private static int counter = 0;private final int id = counter++;//ID from 0++p Rivate Final int delta;//How many milliseconds to stop the private final long trigger;//nanosecond stop//Save the order that the task was created protected static list<delayedtask> s Equence = new arraylist<delayedtask> ();p ublic delayedtask (int delayinmilliseconds) {delta = delayinmilliseconds; Trigger = System.nanotime () + TimeUnit.NANOSECONDS.convert (delta, Timeunit.milliseconds); Sequence.add (this);} @Overridepublic void Run () {System.out.println (this + "Run");} Public String toString () {///1 ID corresponds to a task to be executed in order to execute the task return String.Format ("[%1$-4d]", Delta) + "task" + ID;} Public String Summary ({return "(" + ID + ":" + Delta + ")";} Sort trigger @overridepublic int compareTo (Delayed o) {delayedtask that = (delayedtask) o;if (Trigger < That.trigger) Return-1 ; if (trigger > That.trigger) return 1;return 0;} /** * Tell how long the delay expires, or how long the delay has expired */@Overridepublic long Getdelay (timeunit unit) {//Object expiry time-now time = Execution Time return unit.conver T (Trigger-system.nanotime (), timeunit.nanoseconds);} The way to close everything. The specific stripping is to place it as the last element of the queue. public static class Endsentinel extends Delayedtask{private executorservice exec;public endsentinel (int Delayinmilliseconds, Executorservice c) {super (delayinmilliseconds); exec = C;} @Overridepublic void Run () {for (Delayedtask pt:sequence) {System.out.print (pt.summary () + "");} System.out.println (); System.out.println (this + "calling Shutdownnow"); Exec.shutdownnow ();}}} itself is a task class Delayedtaskconsumer implements Runnable{private delayqueue<delayedtask> Q;public Delayedtaskconsumer (delayqueue<delayedtask> q) {this.q = q;} @Overridepublic void Run () {Try{while (!Thread.interrupted ()) {Q.take (). Run ();//Run task with the current thread the task that is running on the currently threads}} catch (Interruptedexception e) { SYSTEM.OUT.PRINTLN ("acceptable way to Exit =");//an acceptable way to exit}system.out.println ("finished Delayedtaskconsumer");}} public class Delayqueuedemo{public static void Main (string[] args) {Random rand = new Random (47); Executorservice exec = Executors.newcachedthreadpool ();D elayqueue<delayedtask> queue = new delayqueue< Delayedtask> ();//fill with tasks this has the random delays: task filled with stochastic delay for (int i = 0; i <; i++) {Queue.put (new Delaye Dtask (Rand.nextint (5000));} Set Stop point Queue.add (New Delayedtask.endsentinel (), exec), Exec.execute (new Delayedtaskconsumer (queue));}} /** output:[128] Task one run[200] Task 7 run[429] Task 5 run[520] task [run[555] Task 1 run[961] Task 4 run[998]  Task run[1207] Task 9 run[1693] Task 2 run[1809] task [run[1861] Task 3 run[2278] task [run[3288] task ten run[3551] Task run[4258] Task 0 run[4258] Task run[4522] task 8 run[4589] Task 13run[4861] Task run[4868] Task 6 run (0:4,258) (1:555) (2:1693) (3:1861) (4:961) (5:429) (6:4,868) (7:200) (8:4,522) (9:1207 ) (10:3288) (11:128) (12:3551) (13:4589) (14:1809) (15:2278) (16:998) (17:4861) (18:520) (19:4258) (20:5000) [2] Task 0 calling Shutdownnowfinished delayedtaskconsumer*/

Java delayqueue deferred queue 21.7.3-------thinking Java 4