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/*
* Copyright 2015 Open Networking Laboratory
*
* 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 org.onosproject.store.consistent.impl;
import org.onosproject.store.service.AsyncAtomicCounter;
import java.util.concurrent.CompletableFuture;
import static com.google.common.base.Preconditions.checkNotNull;
/**
* Default implementation for a distributed AsyncAtomicCounter backed by
* partitioned Raft DB.
* <p>
* The initial value will be zero.
*/
public class DefaultAsyncAtomicCounter implements AsyncAtomicCounter {
private final String name;
private final Database database;
private final MeteringAgent monitor;
private static final String PRIMITIVE_NAME = "atomicCounter";
private static final String INCREMENT_AND_GET = "incrementAndGet";
private static final String GET_AND_INCREMENT = "getAndIncrement";
private static final String GET_AND_ADD = "getAndAdd";
private static final String ADD_AND_GET = "addAndGet";
private static final String GET = "get";
private static final String SET = "set";
private static final String COMPARE_AND_SET = "compareAndSet";
public DefaultAsyncAtomicCounter(String name,
Database database,
boolean meteringEnabled) {
this.name = checkNotNull(name);
this.database = checkNotNull(database);
this.monitor = new MeteringAgent(PRIMITIVE_NAME, name, meteringEnabled);
}
@Override
public CompletableFuture<Long> incrementAndGet() {
final MeteringAgent.Context timer = monitor.startTimer(INCREMENT_AND_GET);
return addAndGet(1L)
.whenComplete((r, e) -> timer.stop(e));
}
@Override
public CompletableFuture<Long> get() {
final MeteringAgent.Context timer = monitor.startTimer(GET);
return database.counterGet(name)
.whenComplete((r, e) -> timer.stop(e));
}
@Override
public CompletableFuture<Long> getAndIncrement() {
final MeteringAgent.Context timer = monitor.startTimer(GET_AND_INCREMENT);
return getAndAdd(1L)
.whenComplete((r, e) -> timer.stop(e));
}
@Override
public CompletableFuture<Long> getAndAdd(long delta) {
final MeteringAgent.Context timer = monitor.startTimer(GET_AND_ADD);
return database.counterGetAndAdd(name, delta)
.whenComplete((r, e) -> timer.stop(e));
}
@Override
public CompletableFuture<Long> addAndGet(long delta) {
final MeteringAgent.Context timer = monitor.startTimer(ADD_AND_GET);
return database.counterAddAndGet(name, delta)
.whenComplete((r, e) -> timer.stop(e));
}
@Override
public CompletableFuture<Void> set(long value) {
final MeteringAgent.Context timer = monitor.startTimer(SET);
return database.counterSet(name, value)
.whenComplete((r, e) -> timer.stop(e));
}
@Override
public CompletableFuture<Boolean> compareAndSet(long expectedValue, long updateValue) {
final MeteringAgent.Context timer = monitor.startTimer(COMPARE_AND_SET);
return database.counterCompareAndSet(name, expectedValue, updateValue)
.whenComplete((r, e) -> timer.stop(e));
}
}
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