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/*
* Copyright 2017 The gRPC 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 io.grpc.internal;
import com.google.common.annotations.VisibleForTesting;
import io.grpc.internal.Channelz.ChannelStats;
import io.grpc.internal.Channelz.ServerStats;
/**
* A collection of call stats for channelz.
*/
final class CallTracer {
private final TimeProvider timeProvider;
private final LongCounter callsStarted = LongCounterFactory.create();
private final LongCounter callsSucceeded = LongCounterFactory.create();
private final LongCounter callsFailed = LongCounterFactory.create();
private volatile long lastCallStartedMillis;
CallTracer(TimeProvider timeProvider) {
this.timeProvider = timeProvider;
}
public void reportCallStarted() {
callsStarted.add(1);
lastCallStartedMillis = timeProvider.currentTimeMillis();
}
public void reportCallEnded(boolean success) {
if (success) {
callsSucceeded.add(1);
} else {
callsFailed.add(1);
}
}
void updateBuilder(ChannelStats.Builder builder) {
builder
.setCallsStarted(callsStarted.value())
.setCallsSucceeded(callsSucceeded.value())
.setCallsFailed(callsFailed.value())
.setLastCallStartedMillis(lastCallStartedMillis);
}
void updateBuilder(ServerStats.Builder builder) {
builder
.setCallsStarted(callsStarted.value())
.setCallsSucceeded(callsSucceeded.value())
.setCallsFailed(callsFailed.value())
.setLastCallStartedMillis(lastCallStartedMillis);
}
@VisibleForTesting
interface TimeProvider {
/** Returns the current milli time. */
long currentTimeMillis();
}
public interface Factory {
CallTracer create();
}
static final TimeProvider SYSTEM_TIME_PROVIDER = new TimeProvider() {
@Override
public long currentTimeMillis() {
return System.currentTimeMillis();
}
};
static final Factory DEFAULT_FACTORY = new Factory() {
@Override
public CallTracer create() {
return new CallTracer(SYSTEM_TIME_PROVIDER);
}
};
public static Factory getDefaultFactory() {
return DEFAULT_FACTORY;
}
}
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