47 lines
1.3 KiB
Java
47 lines
1.3 KiB
Java
//: com/mindviewinc/util/TaskManager.java
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// ©2015 MindView LLC: see Copyright.txt
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// Managing and executing a queue of tasks.
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package com.mindviewinc.util;
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import java.util.concurrent.*;
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import java.util.*;
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public class TaskManager<R,C extends Callable<R>>
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extends ArrayList<TaskItem<R,C>> {
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private ExecutorService exec =
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Executors.newSingleThreadExecutor();
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public void add(C task) {
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add(new TaskItem<>(exec.submit(task),task));
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}
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public List<R> getResults() {
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Iterator<TaskItem<R,C>> items = iterator();
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List<R> results = new ArrayList<>();
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while(items.hasNext()) {
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TaskItem<R,C> item = items.next();
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if(item.future.isDone()) {
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try {
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results.add(item.future.get());
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} catch(InterruptedException |
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ExecutionException e) {
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throw new RuntimeException(e);
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}
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items.remove();
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}
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}
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return results;
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}
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public List<String> purge() {
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Iterator<TaskItem<R,C>> items = iterator();
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List<String> results = new ArrayList<>();
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while(items.hasNext()) {
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TaskItem<R,C> item = items.next();
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// Leave completed tasks for results reporting:
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if(!item.future.isDone()) {
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results.add("Cancelling " + item.task);
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item.future.cancel(true); // Can interrupt
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items.remove();
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}
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}
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return results;
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}
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} ///:~
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