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// Copyright 2014 The Bazel Authors. All rights reserved.
//
// 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.devtools.build.lib.runtime;
import com.google.devtools.build.lib.events.Event;
import com.google.devtools.build.lib.events.EventHandler;
import com.google.devtools.build.lib.util.BlazeClock;
import com.google.devtools.build.lib.util.Clock;
/**
* An event handler that rate limits events.
*/
public class RateLimitingEventHandler implements EventHandler {
private final EventHandler outputHandler;
private final double intervalMillis;
private final Clock clock;
private long lastEventMillis = -1;
/**
* Creates a new Event handler that rate limits the events of type PROGRESS
* to one per event "rateLimitation" seconds. Events that arrive too quickly are dropped;
* all others are are forwarded to the handler "delegateTo".
*
* @param delegateTo The event handler that ultimately handles the events
* @param rateLimitation The minimum number of seconds between events that will be forwarded
* to the delegateTo-handler.
* If less than zero (or NaN), all events will be forwarded.
*/
public static EventHandler create(EventHandler delegateTo, double rateLimitation) {
if (rateLimitation < 0.0 || Double.isNaN(rateLimitation)) {
return delegateTo;
}
return new RateLimitingEventHandler(delegateTo, rateLimitation);
}
private RateLimitingEventHandler(EventHandler delegateTo, double rateLimitation) {
clock = BlazeClock.instance();
outputHandler = delegateTo;
this.intervalMillis = rateLimitation * 1000;
}
@Override
public void handle(Event event) {
switch (event.getKind()) {
case PROGRESS:
case START:
case FINISH:
long currentTime = clock.currentTimeMillis();
if (lastEventMillis + intervalMillis <= currentTime) {
lastEventMillis = currentTime;
outputHandler.handle(event);
}
break;
default:
outputHandler.handle(event);
break;
}
}
}
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