| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.apache.ignite.events; |
| |
| import java.util.Collection; |
| import org.apache.ignite.IgniteEvents; |
| import org.apache.ignite.cluster.BaselineNode; |
| import org.apache.ignite.cluster.ClusterNode; |
| import org.apache.ignite.configuration.IgniteConfiguration; |
| import org.apache.ignite.lang.IgnitePredicate; |
| |
| /** |
| * Baseline changed event. |
| * <p> |
| * Grid events are used for notification about what happens within the grid. Note that by |
| * design Ignite keeps all events generated on the local node locally and it provides |
| * APIs for performing a distributed queries across multiple nodes: |
| * <ul> |
| * <li> |
| * {@link IgniteEvents#remoteQuery(IgnitePredicate, long, int...)} - |
| * asynchronously querying events occurred on the nodes specified, including remote nodes. |
| * </li> |
| * <li> |
| * {@link IgniteEvents#localQuery(IgnitePredicate, int...)} - |
| * querying only local events stored on this local node. |
| * </li> |
| * <li> |
| * {@link IgniteEvents#localListen(IgnitePredicate, int...)} - |
| * listening to local grid events (events from remote nodes not included). |
| * </li> |
| * </ul> |
| * User can also wait for events using method {@link IgniteEvents#waitForLocal(IgnitePredicate, int...)}. |
| * <h1 class="header">Events and Performance</h1> |
| * Note that by default all events in Ignite are enabled and therefore generated and stored |
| * by whatever event storage SPI is configured. Ignite can and often does generate thousands events per seconds |
| * under the load and therefore it creates a significant additional load on the system. If these events are |
| * not needed by the application this load is unnecessary and leads to significant performance degradation. |
| * <p> |
| * It is <b>highly recommended</b> to enable only those events that your application logic requires |
| * by using {@link IgniteConfiguration#getIncludeEventTypes()} method in Ignite configuration. Note that certain |
| * events are required for Ignite's internal operations and such events will still be generated but not stored by |
| * event storage SPI if they are disabled in Ignite configuration. |
| * @see EventType#EVT_BASELINE_CHANGED |
| */ |
| public class BaselineChangedEvent extends EventAdapter { |
| /** Serial version uid. */ |
| private static final long serialVersionUID = 0L; |
| |
| /** Baseline nodes. */ |
| private final Collection<BaselineNode> baselineNodes; |
| |
| /** |
| * Creates baseline changed event with given parameters. |
| * @param node Node. |
| * @param msg Optional event message. |
| * @param type Event type. |
| * @param baselineNodes Collection of new baseline nodes. |
| */ |
| public BaselineChangedEvent( |
| ClusterNode node, |
| String msg, |
| int type, |
| Collection<BaselineNode> baselineNodes |
| ) { |
| super(node, msg, type); |
| |
| //noinspection AssignmentOrReturnOfFieldWithMutableType |
| this.baselineNodes = baselineNodes; |
| } |
| |
| /** New baseline nodes. */ |
| public Collection<BaselineNode> baselineNodes() { |
| //noinspection AssignmentOrReturnOfFieldWithMutableType |
| return baselineNodes; |
| } |
| } |