private static void slowExample(WorkerPool workerPool, int nTasks) {
List<Callable<Integer>> taskList = new ArrayList<Callable<Integer>>();
Random random = new Random();
int maxWait = 10000;
for (int i = 1; i <= nTasks; i++) {
final int wait = random.nextInt(maxWait);
Callable<Integer> callable =
new Callable<Integer>() {
@Override
public Integer call() throws Exception {
Thread.sleep(wait);
return wait;
}
};
taskList.add(callable);
}
long start = System.currentTimeMillis();
List<Integer> waits = workerPool.invokeAll(taskList);
long finish = System.currentTimeMillis();
int longestWait = 0;
int totalWait = 0;
for (int wait : waits) {
longestWait = wait > longestWait ? wait : longestWait;
totalWait += wait;
}
System.out.println(
String.format(
"elapsed time: %5d ms (%.2f%%)",
finish - start, 100 * (1.0 * (finish - start)) / totalWait));
System.out.println(String.format("longest wait: %5d ms", longestWait));
System.out.println(String.format("average wait: %5d ms", totalWait / nTasks));
System.out.println(String.format("total wait: %5d ms", totalWait));
}
/**
* Return strings including the integers -1 through -10.
*
* @param workerPool
*/
private static void listExample(WorkerPool workerPool) {
List<Callable<String>> taskList = new ArrayList<Callable<String>>();
for (int i = 1; i <= 10; i++) {
final String input = Integer.toString(-1 * i);
Callable<String> callable =
new Callable<String>() {
@Override
public String call() throws Exception {
// do all your parallelizable work here
return "R(" + input + ")";
}
};
taskList.add(callable);
}
List<String> resultList = workerPool.invokeAll(taskList);
for (String result : resultList) {
System.out.println("result: " + result);
}
}
/**
* Calculate the squares of the integers 1 through 10.
*
* @param workerPool
*/
private static void mapExample(WorkerPool workerPool) {
Map<Integer, Callable<Integer>> taskMap = new HashMap<Integer, Callable<Integer>>();
for (int i = 1; i <= 10; i++) {
final int input = i;
Callable<Integer> callable =
new Callable<Integer>() {
@Override
public Integer call() throws Exception {
// do all your parallelizable work here
return input * input;
}
};
taskMap.put(i, callable);
}
Map<Integer, Integer> resultMap = workerPool.invokeAll(taskMap);
for (Map.Entry<Integer, Integer> entry : resultMap.entrySet()) {
System.out.println("key: " + entry.getKey() + ", value: " + entry.getValue());
}
}
