/**
* Copyright 2015 Netflix, Inc.
*
* 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.netflix.spectator.spark;
import com.netflix.spectator.api.Clock;
import com.netflix.spectator.api.Counter;
import com.netflix.spectator.api.Id;
import com.netflix.spectator.api.Measurement;
import java.util.Collections;
import java.util.concurrent.atomic.AtomicLong;
/**
* Counter that tracks the delta since the last measurement was taken.
*/
class SidecarCounter implements Counter {
private final Clock clock;
private final Id id;
private final AtomicLong value;
/** Create a new instance. */
SidecarCounter(Clock clock, Id id) {
this.clock = clock;
this.id = id.withTag(DataType.COUNTER);
this.value = new AtomicLong(0L);
}
@Override public Id id() {
return id;
}
@Override public void increment() {
value.incrementAndGet();
}
@Override public void increment(long amount) {
value.addAndGet(amount);
}
@Override public long count() {
return value.get();
}
@Override public Iterable<Measurement> measure() {
Measurement m = new Measurement(id, clock.wallTime(), value.getAndSet(0L));
return Collections.singletonList(m);
}
@Override public boolean hasExpired() {
return false;
}
}