Examples with StateChangeListener com.facebook.presto.execution.StateMachine.StateChangeListener used on opensource projects

Example 1 with StateChangeListener

use of com.facebook.presto.execution.StateMachine.StateChangeListener in project presto by prestodb.

the class QueryStateMachine method addQueryInfoStateChangeListener.

/**
 * Add a listener for the final query info.  This notification is guaranteed to be fired only once.
 * Listener is always notified asynchronously using a dedicated notification thread pool so, care should
 * be taken to avoid leaking {@code this} when adding a listener in a constructor.
 */
public void addQueryInfoStateChangeListener(StateChangeListener<QueryInfo> stateChangeListener) {
    AtomicBoolean done = new AtomicBoolean();
    StateChangeListener<Optional<QueryInfo>> fireOnceStateChangeListener = finalQueryInfo -> {
        if (finalQueryInfo.isPresent() && done.compareAndSet(false, true)) {
            stateChangeListener.stateChanged(finalQueryInfo.get());
        }
    };
    finalQueryInfo.addStateChangeListener(fireOnceStateChangeListener);
}

Example 2 with StateChangeListener

use of com.facebook.presto.execution.StateMachine.StateChangeListener in project presto by prestodb.

the class TaskInfoFetcher method addFinalTaskInfoListener.

/**
 * Add a listener for the final task info.  This notification is guaranteed to be fired only once.
 * Listener is always notified asynchronously using a dedicated notification thread pool so, care should
 * be taken to avoid leaking {@code this} when adding a listener in a constructor. Additionally, it is
 * possible notifications are observed out of order due to the asynchronous execution.
 */
public void addFinalTaskInfoListener(StateChangeListener<TaskInfo> stateChangeListener) {
    AtomicBoolean done = new AtomicBoolean();
    StateChangeListener<Optional<TaskInfo>> fireOnceStateChangeListener = finalTaskInfo -> {
        if (finalTaskInfo.isPresent() && done.compareAndSet(false, true)) {
            stateChangeListener.stateChanged(finalTaskInfo.get());
        }
    };
    finalTaskInfo.addStateChangeListener(fireOnceStateChangeListener);
    fireOnceStateChangeListener.stateChanged(finalTaskInfo.get());
}

Example 3 with StateChangeListener

use of com.facebook.presto.execution.StateMachine.StateChangeListener in project presto by prestodb.

the class StageExecutionStateMachine method addFinalStageInfoListener.

/**
 * Add a listener for the final stage info.  This notification is guaranteed to be fired only once.
 * Listener is always notified asynchronously using a dedicated notification thread pool so, care should
 * be taken to avoid leaking {@code this} when adding a listener in a constructor. Additionally, it is
 * possible notifications are observed out of order due to the asynchronous execution.
 */
public void addFinalStageInfoListener(StateChangeListener<StageExecutionInfo> finalStatusListener) {
    AtomicBoolean done = new AtomicBoolean();
    StateChangeListener<Optional<StageExecutionInfo>> fireOnceStateChangeListener = finalStageInfo -> {
        if (finalStageInfo.isPresent() && done.compareAndSet(false, true)) {
            finalStatusListener.stateChanged(finalStageInfo.get());
        }
    };
    finalInfo.addStateChangeListener(fireOnceStateChangeListener);
}