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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.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 (Timer0.Context ctx = timer.start()) {
* }
* </pre>
*/
public abstract class Timer0 implements RegistrationHandle {
public static class Context extends TimerContext {
private final Timer0 timer;
Context(Timer0 timer) {
this.timer = timer;
}
@Override
public void record(long elapsed) {
timer.record(elapsed, NANOSECONDS);
}
}
/**
* Begin a timer for the current block, value will be recorded when closed.
*
* @return timer context
*/
public Context start() {
return new Context(this);
}
/**
* Record a value in the distribution.
*
* @param value value to record
* @param unit time unit of the value
*/
public abstract void record(long value, TimeUnit unit);
}
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