eb17f3b410
This allows us to see from a trace how long operations took that are captured by timer metrics. Example log entry on push: [2018-08-29 10:28:37,080] [ReceiveCommits-1] TRACE com.google.gerrit.metrics.Timer0.Context : http/server/rest_api/change_json/to_change_info_latency took 24ms [CONTEXT forced=true RECEIVE_ID="foo-1535531316769-7edf2a7b" TRACE_ID="1535531316773-7edf2a7b" ] Change-Id: Ib0024cce95693d99781aee8a2b78b777c7c4ce3b Signed-off-by: Edwin Kempin <ekempin@google.com>
73 lines
2.0 KiB
Java
73 lines
2.0 KiB
Java
// Copyright (C) 2015 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package com.google.gerrit.metrics;
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import static java.util.concurrent.TimeUnit.NANOSECONDS;
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import com.google.common.flogger.FluentLogger;
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import com.google.gerrit.extensions.registration.RegistrationHandle;
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import java.util.concurrent.TimeUnit;
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/**
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* Records elapsed time for an operation or span.
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*
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* <p>Typical usage in a try-with-resources block:
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*
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* <pre>
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* try (Timer0.Context ctx = timer.start()) {
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* }
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* </pre>
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*/
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public abstract class Timer0 implements RegistrationHandle {
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public static class Context extends TimerContext {
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private static final FluentLogger logger = FluentLogger.forEnclosingClass();
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private final Timer0 timer;
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Context(Timer0 timer) {
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this.timer = timer;
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}
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@Override
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public void record(long elapsed) {
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logger.atFinest().log("%s took %dms", timer.name, TimeUnit.NANOSECONDS.toMillis(elapsed));
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timer.record(elapsed, NANOSECONDS);
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}
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}
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protected final String name;
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public Timer0(String name) {
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this.name = name;
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}
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/**
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* Begin a timer for the current block, value will be recorded when closed.
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*
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* @return timer context
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*/
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public Context start() {
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return new Context(this);
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}
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/**
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* Record a value in the distribution.
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*
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* @param value value to record
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* @param unit time unit of the value
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*/
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public abstract void record(long value, TimeUnit unit);
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}
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