dagger.producers.monitoring.ProducerTimingRecorder Maven / Gradle / Ivy
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/*
* Copyright (C) 2015 The Dagger Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package dagger.producers.monitoring;
import dagger.producers.Produces;
import dagger.producers.ProductionComponent;
/**
* A hook for recording the timing of the execution of individual
* {@linkplain Produces producer methods}. See {@link ProductionComponentTimingRecorder} for how to
* install these monitors.
*
* If any of the recorder's methods throw, then the exception will be logged and processing will
* continue unaffected.
*
*
All timings are measured at nanosecond precision, but not necessarily nanosecond resolution.
* That is, timings will be reported in nanoseconds, but the timing source will not necessarily
* update at nanosecond resolution. For example, {@link System#nanoTime()} would satisfy these
* constraints.
*
* @since 2.1
*/
public abstract class ProducerTimingRecorder {
/**
* Reports that the producer method has finished executing with the given statistics.
*
*
If the producer was skipped due to any of its inputs failing, then this will not be called.
*
* @param startedNanos the wall-clock time, in nanoseconds, when the producer method started
* executing, measured from when the first method on the
* {@linkplain ProductionComponent production component} was called.
* @param durationNanos the wall-clock time, in nanoseconds, that the producer method took to
* execute.
*/
public void recordMethod(long startedNanos, long durationNanos) {}
/**
* Reports that the producer's future has succeeded with the given statistics.
*
*
If the producer was skipped due to any of its inputs failing, then this will not be called.
*
* @param latencyNanos the wall-clock time, in nanoseconds, of the producer's latency, measured
* from when the producer method started to when the future finished.
*/
public void recordSuccess(long latencyNanos) {}
/**
* Reports that the producer's future has failed with the given statistics.
*
* @param exception the exception that the future failed with.
* @param latencyNanos the wall-clock time, in nanoseconds, of the producer's latency, measured
* from when the producer method started to when the future finished.
*/
public void recordFailure(Throwable exception, long latencyNanos) {}
/**
* Reports that the producer was skipped because one of its inputs failed.
*
* @param exception the exception that its input failed with. If multiple inputs failed, this
* exception will be chosen arbitrarily from the input failures.
*/
public void recordSkip(Throwable exception) {}
/** Returns a producer recorder that does nothing. */
public static ProducerTimingRecorder noOp() {
return NO_OP;
}
private static final ProducerTimingRecorder NO_OP = new ProducerTimingRecorder() {};
}