dagger.producers.monitoring.TimingProductionComponentMonitor.java Source code

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Here is the source code for dagger.producers.monitoring.TimingProductionComponentMonitor.java

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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 com.google.common.base.Stopwatch;
import com.google.common.base.Ticker;
import dagger.internal.Beta;

/**
 * A monitor that measures the timing of the execution of a production component, and logs those
 * timings with the given recorder.
 *
 * <p>This assumes that the given recorders do not throw or return null; for example, by using
 * {@link TimingRecorders#delegatingProductionComponentTimingRecorderFactory}.
 */
// TODO(beder): Reduce the visibility of this class to package-private.
@Beta
public final class TimingProductionComponentMonitor extends ProductionComponentMonitor {
    private final ProductionComponentTimingRecorder recorder;
    private final Ticker ticker;
    private final Stopwatch stopwatch;

    TimingProductionComponentMonitor(ProductionComponentTimingRecorder recorder, Ticker ticker) {
        this.recorder = recorder;
        this.ticker = ticker;
        this.stopwatch = Stopwatch.createStarted(ticker);
    }

    @Override
    public ProducerMonitor producerMonitorFor(ProducerToken token) {
        return new TimingProducerMonitor(recorder.producerTimingRecorderFor(token), ticker, stopwatch);
    }

    public static final class Factory extends ProductionComponentMonitor.Factory {
        private final ProductionComponentTimingRecorder.Factory recorderFactory;
        private final Ticker ticker;

        public Factory(ProductionComponentTimingRecorder.Factory recorderFactory) {
            this(recorderFactory, Ticker.systemTicker());
        }

        Factory(ProductionComponentTimingRecorder.Factory recorderFactory, Ticker ticker) {
            this.recorderFactory = recorderFactory;
            this.ticker = ticker;
        }

        @Override
        public ProductionComponentMonitor create(Object component) {
            return new TimingProductionComponentMonitor(recorderFactory.create(component), ticker);
        }
    }
}