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// Copyright (C) 2015 The Android Open Source Project
//
// 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 com.google.gerrit.metrics;
import static java.util.concurrent.TimeUnit.NANOSECONDS;
import com.google.common.flogger.FluentLogger;
import com.google.gerrit.extensions.registration.RegistrationHandle;
import java.util.concurrent.TimeUnit;
/**
* Records elapsed time for an operation or span.
*
* <p>Typical usage in a try-with-resources block:
*
* <pre>
* try (Timer3.Context ctx = timer.start(field)) {
* }
* </pre>
*
* @param <F1> type of the field.
* @param <F2> type of the field.
* @param <F3> type of the field.
*/
public abstract class Timer3<F1, F2, F3> implements RegistrationHandle {
private static final FluentLogger logger = FluentLogger.forEnclosingClass();
public static class Context extends TimerContext {
private final Timer3<Object, Object, Object> timer;
private final Object field1;
private final Object field2;
private final Object field3;
@SuppressWarnings("unchecked")
<F1, F2, F3> Context(Timer3<F1, F2, F3> timer, F1 f1, F2 f2, F3 f3) {
this.timer = (Timer3<Object, Object, Object>) timer;
this.field1 = f1;
this.field2 = f2;
this.field3 = f3;
}
@Override
public void record(long elapsed) {
timer.record(field1, field2, field3, elapsed, NANOSECONDS);
}
}
protected final String name;
public Timer3(String name) {
this.name = name;
}
/**
* Begin a timer for the current block, value will be recorded when closed.
*
* @param field1 bucket to record the timer
* @param field2 bucket to record the timer
* @param field3 bucket to record the timer
* @return timer context
*/
public Context start(F1 field1, F2 field2, F3 field3) {
return new Context(this, field1, field2, field3);
}
/**
* Record a value in the distribution.
*
* @param field1 bucket to record the timer
* @param field2 bucket to record the timer
* @param field3 bucket to record the timer
* @param value value to record
* @param unit time unit of the value
*/
public final void record(F1 field1, F2 field2, F3 field3, long value, TimeUnit unit) {
logger.atFinest().log(
"%s (%s, %s, %s) took %dms", name, field1, field2, field3, unit.toMillis(value));
doRecord(field1, field2, field3, value, unit);
}
/**
* Record a value in the distribution.
*
* @param field1 bucket to record the timer
* @param field2 bucket to record the timer
* @param field3 bucket to record the timer
* @param value value to record
* @param unit time unit of the value
*/
protected abstract void doRecord(F1 field1, F2 field2, F3 field3, long value, TimeUnit unit);
}
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