/*
* 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.console.agent.handlers;
import io.socket.client.Ack;
import io.socket.emitter.Emitter;
import java.util.Arrays;
import java.util.Collections;
import java.util.Map;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import org.apache.log4j.Logger;
import static org.apache.ignite.console.agent.AgentUtils.removeCallback;
import static org.apache.ignite.console.agent.AgentUtils.fromJSON;
import static org.apache.ignite.console.agent.AgentUtils.safeCallback;
import static org.apache.ignite.console.agent.AgentUtils.toJSON;
/**
* Base class for web socket handlers.
*/
abstract class AbstractListener implements Emitter.Listener {
/** */
private ExecutorService pool;
/** */
final Logger log = Logger.getLogger(this.getClass().getName());
/** {@inheritDoc} */
@SuppressWarnings("unchecked")
@Override public final void call(Object... args) {
final Ack cb = safeCallback(args);
args = removeCallback(args);
try {
final Map<String, Object> params;
if (args == null || args.length == 0)
params = Collections.emptyMap();
else if (args.length == 1)
params = fromJSON(args[0], Map.class);
else
throw new IllegalArgumentException("Wrong arguments count, must be <= 1: " + Arrays.toString(args));
if (pool == null)
pool = newThreadPool();
pool.submit(new Runnable() {
@Override public void run() {
try {
Object res = execute(params);
cb.call(null, toJSON(res));
} catch (Exception e) {
cb.call(e, null);
}
}
});
}
catch (Exception e) {
cb.call(e, null);
}
}
/**
* Stop handler.
*/
public void stop() {
if (pool != null)
pool.shutdownNow();
}
/**
* Creates a thread pool that can schedule commands to run after a given delay, or to execute periodically.
*
* @return Newly created thread pool.
*/
protected ExecutorService newThreadPool() {
return Executors.newSingleThreadExecutor();
}
/**
* Execute command with specified arguments.
*
* @param args Map with method args.
*/
public abstract Object execute(Map<String, Object> args) throws Exception;
}