Package org.apache.drill.exec.store

Class TimedCallable<V>

java.lang.Object

org.apache.drill.exec.store.TimedCallable<V>

Type Parameters:

V - The time value that will be returned when the task is executed.

All Implemented Interfaces:

Callable<V>

public abstract class TimedCallable<V>
extends Object
implements Callable<V>

Allows parallel executions of tasks in a simplified way. Also maintains and reports timings of task completion.

TODO: look at switching to fork join.

Constructor Summary

Constructors

Constructor	Description
TimedCallable()

Method Summary

Modifier and Type	Method	Description
final V	call()
static <V> List<V>	run(String activity, org.slf4j.Logger logger, List<TimedCallable<V>> tasks, int parallelism)	Execute the list of runnables with the given parallelization.
protected abstract V	runInner()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

TimedCallable

public TimedCallable()

Method Details

call

public final V call()
             throws Exception

Specified by:

call in interface Callable<V>

Throws:

Exception

runInner

protected abstract V runInner()
                       throws Exception

Throws:

Exception

run

public static <V> List<V> run(String activity,
 org.slf4j.Logger logger,
 List<TimedCallable<V>> tasks,
 int parallelism)
                       throws IOException

Execute the list of runnables with the given parallelization. At end, return values and report completion time stats to provided logger. Each runnable is allowed a certain timeout. If the timeout exceeds, existing/pending tasks will be cancelled and a UserException is thrown.

Parameters:

activity - Name of activity for reporting in logger.

logger - The logger to use to report results.

tasks - List of callable that should be executed and timed. If this list has one item, task will be completed in-thread. Each callable must handle InterruptedExceptions.

parallelism - The number of threads that should be run to complete this task.

Returns:

The list of outcome objects.

Throws:

IOException - All exceptions are coerced to IOException since this was build for storage system tasks initially.