com.hazelcast.map.impl.InternalMapListenerAdapter Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2020, 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.map.impl;
import com.hazelcast.core.EntryEventType;
import com.hazelcast.map.IMapEvent;
import com.hazelcast.map.listener.MapListener;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import static com.hazelcast.map.impl.MapListenerAdaptors.createListenerAdapters;
import static com.hazelcast.internal.util.Preconditions.isNotNull;
/**
* Internal-usage-only adapter which wraps all {@link MapListener} sub-interfaces into a {@link ListenerAdapter}.
*
* Main purpose of this adapter is to avoid lots of instanceOf checks when firing events to check whether or not
* a corresponding {@link MapListener} sub-interface for a specific {@link com.hazelcast.core.EntryEventType} is extended.
* And also to provide an abstraction over all {@link MapListener} sub-interfaces to make a smooth usage when passing
* fired events to listeners e.g. only calling {@link ListenerAdapter#onEvent} is sufficient to fire any event.
*/
public class InternalMapListenerAdapter implements ListenerAdapter {
private final ListenerAdapter[] listenerAdapters;
InternalMapListenerAdapter(MapListener mapListener) {
isNotNull(mapListener, "mapListener");
this.listenerAdapters = createListenerAdapters(mapListener);
}
@Override
public void onEvent(IMapEvent event) {
EntryEventType eventType = event.getEventType();
if (eventType == null) {
return;
}
ListenerAdapter listenerAdapter = listenerAdapters[eventType.ordinal()];
if (listenerAdapter == null) {
return;
}
listenerAdapter.onEvent(event);
}
@SuppressFBWarnings(value = "EI_EXPOSE_REP", justification = "listenerAdapters internal state is never changed")
public ListenerAdapter[] getListenerAdapters() {
return listenerAdapters;
}
}