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package template;
public class ThreadWaiter {
/** Wait for completion of all threads */
public static final <T extends Thread> boolean waitForThreads(Iterable<T> iter){
//Wait for completion of all threads
boolean success=true;
for(T t : iter){
//Wait until this thread has terminated
while(t.getState()!=Thread.State.TERMINATED){
try {
//Attempt a join operation
t.join();
} catch (InterruptedException e) {
//Potentially handle this, if it is expected to occur
e.printStackTrace();
}
}
}
return success;
}
public static final <T extends Thread> void startThreads(Iterable<T> iter){
for(Thread t : iter){t.start();}
}
/**
* @param iter List of Threads.
* @return success
*/
public static final <T extends Thread> boolean startAndWait(Iterable<T> iter){
startThreads(iter);
return waitForThreads(iter);
}
/**
* @param iter List of Threads.
* @return success
*/
public static final <T extends Thread> boolean startAndWait(Iterable<T> iter, Accumulator<T> acc){
startThreads(iter);
// assert(false);
return waitForThreads(iter, acc);
}
/** Wait for completion of all threads, and accumulate results */
public static final <T extends Thread> boolean waitForThreads(Iterable<T> iter, Accumulator<T> acc){
waitForThreads(iter);
accumulate(iter, acc);
return acc.success();
}
/** Accumulate results from all threads */
private static final <T> boolean accumulate(Iterable<T> iter, Accumulator<T> acc){
//Wait for completion of all threads
for(T t : iter){
// assert(t.getState()==Thread.State.TERMINATED);//Not strictly necessary; requires T to be a thread.
//Accumulate per-thread statistics
acc.accumulate(t);
}
return acc.success();
}
}
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