org.apache.drill.exec.store

Class TimedRunnable<V>

java.lang.Object

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

Type Parameters:

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

All Implemented Interfaces:

Runnable

public abstract class TimedRunnable<V>
extends Object
implements Runnable

Class used to allow 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 and Description
TimedRunnable()

Method Summary

Methods

Modifier and Type	Method and Description
protected abstract IOException	convertToIOException(Exception e)
long	getThreadStart()
long	getTimeSpentNanos()
V	getValue()
void	run()
static <V> List<V>	run(String activity, org.slf4j.Logger logger, List<TimedRunnable<V>> runnables, 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 Detail

TimedRunnable

public TimedRunnable()

Method Detail

run

public final void run()

Specified by:

run in interface Runnable

runInner

protected abstract V runInner()
                       throws Exception

Throws:

Exception

convertToIOException

protected abstract IOException convertToIOException(Exception e)

getThreadStart

public long getThreadStart()

getTimeSpentNanos

public long getTimeSpentNanos()

getValue

public final V getValue()
                 throws IOException

Throws:

IOException

run

public static <V> List<V> run(String activity,
              org.slf4j.Logger logger,
              List<TimedRunnable<V>> runnables,
              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.

runnables - List of runnables that should be executed and timed. If this list has one item, task will be completed in-thread. Runnable 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.