/*
* Copyright (c) 2008-2017, Hazelcast, Inc. 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.hazelcast.internal.networking.nio.iobalancer;
import com.hazelcast.internal.networking.nio.MigratableHandler;
import com.hazelcast.internal.networking.nio.NioThread;
import com.hazelcast.internal.networking.nio.SelectionHandler;
import com.hazelcast.util.ItemCounter;
import java.util.Map;
import java.util.Set;
/**
* Describes a state of NioThread (im-)balance.
*
* It's used by {@link MigrationStrategy} to decide whether and what
* {@link SelectionHandler} should be migrated.
*/
class LoadImbalance {
//number of events recorded by the busiest NioThread
long maximumEvents;
//number of events recorded by the least busy NioThread
long minimumEvents;
//busiest NioThread
NioThread sourceSelector;
//least busy NioThread
NioThread destinationSelector;
private final Map<NioThread, Set<MigratableHandler>> selectorToHandlers;
private final ItemCounter<MigratableHandler> handlerLoadCounter;
LoadImbalance(Map<NioThread, Set<MigratableHandler>> selectorToHandlers,
ItemCounter<MigratableHandler> handlerLoadCounter) {
this.selectorToHandlers = selectorToHandlers;
this.handlerLoadCounter = handlerLoadCounter;
}
/**
* @param selector
* @return A set of Handlers owned by the selector
*/
Set<MigratableHandler> getHandlersOwnerBy(NioThread selector) {
return selectorToHandlers.get(selector);
}
/**
* @param handler
* @return number of events recorded by the handler
*/
long getLoad(MigratableHandler handler) {
return handlerLoadCounter.get(handler);
}
}