/*
* Copyright 2014 the original author or authors.
*
* 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 net.kuujo.vertigo.cluster.data.impl;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import net.kuujo.vertigo.cluster.data.AsyncMap;
import net.kuujo.vertigo.cluster.data.MapEvent;
import net.kuujo.vertigo.cluster.data.WatchableAsyncMap;
import net.kuujo.vertigo.cluster.data.MapEvent.Type;
import net.kuujo.vertigo.util.CountingCompletionHandler;
import org.vertx.java.core.AsyncResult;
import org.vertx.java.core.Handler;
import org.vertx.java.core.Vertx;
import org.vertx.java.core.eventbus.EventBus;
import org.vertx.java.core.eventbus.Message;
import org.vertx.java.core.impl.DefaultFutureResult;
import org.vertx.java.core.json.JsonObject;
/**
* Wrapped watchable asynchronous map.
*
* @author <a href="http://github.com/kuujo">Jordan Halterman</a>
*
* @param <K> The map key type.
* @param <V> The map value type.
*/
public class WrappedWatchableAsyncMap<K, V> implements WatchableAsyncMap<K, V> {
private final AsyncMap<K, V> map;
private final EventBus eventBus;
private final Map<MapEvent.Type, Map<Handler<MapEvent<K, V>>, Handler<Message<JsonObject>>>> watchHandlers = new HashMap<>();
public WrappedWatchableAsyncMap(AsyncMap<K, V> map, Vertx vertx) {
this.map = map;
this.eventBus = vertx.eventBus();
}
@Override
public String name() {
return map.name();
}
@Override
public void put(K key, V value) {
put(key, value, null);
}
@Override
public void put(final K key, final V value, final Handler<AsyncResult<V>> doneHandler) {
map.put(key, value, new Handler<AsyncResult<V>>() {
@Override
public void handle(AsyncResult<V> result) {
eventBus.publish(String.format("%s.%s.%s", map.name(), key, MapEvent.Type.CHANGE.toString()), new JsonObject()
.putString("type", MapEvent.Type.CHANGE.toString())
.putValue("key", key)
.putValue("value", value));
String event = result.result() == null ? MapEvent.Type.CREATE.toString() : MapEvent.Type.UPDATE.toString();
eventBus.publish(String.format("%s.%s.%s", map.name(), key, event), new JsonObject()
.putString("type", event)
.putValue("key", key)
.putValue("value", value));
if (doneHandler != null) {
doneHandler.handle(result);
}
}
});
}
@Override
public void get(K key, Handler<AsyncResult<V>> resultHandler) {
map.get(key, resultHandler);
}
@Override
public void remove(K key) {
remove(key, null);
}
@Override
public void remove(final K key, final Handler<AsyncResult<V>> resultHandler) {
map.remove(key, new Handler<AsyncResult<V>>() {
@Override
public void handle(AsyncResult<V> result) {
eventBus.publish(String.format("%s.%s.%s", map.name(), key, MapEvent.Type.CHANGE.toString()), new JsonObject()
.putString("type", MapEvent.Type.CHANGE.toString())
.putValue("key", key)
.putValue("value", result.result()));
eventBus.publish(String.format("%s.%s.%s", map.name(), key, MapEvent.Type.DELETE.toString()), new JsonObject()
.putString("type", MapEvent.Type.DELETE.toString())
.putValue("key", key)
.putValue("value", result.result()));
if (resultHandler != null) {
resultHandler.handle(result);
}
}
});
}
@Override
public void containsKey(K key, Handler<AsyncResult<Boolean>> resultHandler) {
map.containsKey(key, resultHandler);
}
@Override
public void keySet(Handler<AsyncResult<Set<K>>> resultHandler) {
map.keySet(resultHandler);
}
@Override
public void values(Handler<AsyncResult<Collection<V>>> resultHandler) {
map.values(resultHandler);
}
@Override
public void size(Handler<AsyncResult<Integer>> resultHandler) {
map.size(resultHandler);
}
@Override
public void isEmpty(Handler<AsyncResult<Boolean>> resultHandler) {
map.isEmpty(resultHandler);
}
@Override
public void clear() {
map.clear();
}
@Override
public void clear(Handler<AsyncResult<Void>> doneHandler) {
map.clear(doneHandler);
}
@Override
public void watch(K key, Handler<MapEvent<K, V>> handler) {
watch(key, null, handler, null);
}
@Override
public void watch(K key, Handler<MapEvent<K, V>> handler, Handler<AsyncResult<Void>> doneHandler) {
watch(key, null, handler, doneHandler);
}
@Override
public void watch(K key, Type event, Handler<MapEvent<K, V>> handler) {
watch(key, event, handler, null);
}
@Override
public void watch(final K key, final Type event, final Handler<MapEvent<K, V>> handler, Handler<AsyncResult<Void>> doneHandler) {
if (event == null) {
final CountingCompletionHandler<Void> counter = new CountingCompletionHandler<Void>(4).setHandler(doneHandler);
addWatcher(key, MapEvent.Type.CHANGE, handler, counter);
addWatcher(key, MapEvent.Type.CREATE, handler, counter);
addWatcher(key, MapEvent.Type.UPDATE, handler, counter);
addWatcher(key, MapEvent.Type.DELETE, handler, counter);
} else {
addWatcher(key, event, handler, doneHandler);
}
}
private void addWatcher(K key, final MapEvent.Type event, final Handler<MapEvent<K, V>> handler, Handler<AsyncResult<Void>> doneHandler) {
Map<Handler<MapEvent<K, V>>, Handler<Message<JsonObject>>> watchHandlers = this.watchHandlers.get(event);
if (watchHandlers == null) {
watchHandlers = new HashMap<>();
this.watchHandlers.put(event, watchHandlers);
}
Handler<Message<JsonObject>> wrappedHandler;
if (!watchHandlers.containsKey(handler)) {
wrappedHandler = new Handler<Message<JsonObject>>() {
@Override
public void handle(Message<JsonObject> message) {
K key = message.body().getValue("key");
V value = message.body().getValue("value");
handler.handle(new MapEvent<K, V>(event, key, value));
}
};
watchHandlers.put(handler, wrappedHandler);
} else {
wrappedHandler = watchHandlers.get(handler);
}
eventBus.registerHandler(String.format("%s.%s.%s", map.name(), key, event.toString()), wrappedHandler, doneHandler);
}
@Override
public void unwatch(K key, Handler<MapEvent<K, V>> handler) {
unwatch(key, null, handler, null);
}
@Override
public void unwatch(K key, Handler<MapEvent<K, V>> handler, Handler<AsyncResult<Void>> doneHandler) {
unwatch(key, null, handler, doneHandler);
}
@Override
public void unwatch(K key, Type event, Handler<MapEvent<K, V>> handler) {
unwatch(key, event, handler, null);
}
@Override
public void unwatch(K key, Type event, Handler<MapEvent<K, V>> handler, Handler<AsyncResult<Void>> doneHandler) {
if (event == null) {
final CountingCompletionHandler<Void> counter = new CountingCompletionHandler<Void>(4).setHandler(doneHandler);
removeWatcher(key, MapEvent.Type.CHANGE, handler, counter);
removeWatcher(key, MapEvent.Type.CREATE, handler, counter);
removeWatcher(key, MapEvent.Type.UPDATE, handler, counter);
removeWatcher(key, MapEvent.Type.DELETE, handler, counter);
} else {
removeWatcher(key, event, handler, doneHandler);
}
}
private void removeWatcher(K key, MapEvent.Type event, Handler<MapEvent<K, V>> handler, Handler<AsyncResult<Void>> doneHandler) {
Map<Handler<MapEvent<K, V>>, Handler<Message<JsonObject>>> watchHandlers = this.watchHandlers.get(event);
if (watchHandlers == null || !watchHandlers.containsKey(handler)) {
new DefaultFutureResult<Void>((Void) null).setHandler(doneHandler);
} else {
Handler<Message<JsonObject>> wrappedHandler = watchHandlers.remove(handler);
eventBus.unregisterHandler(String.format("%s.%s.%s", map.name(), key, event.toString()), wrappedHandler, doneHandler);
}
}
}