/**
* 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.tajo.rpc;
import com.google.protobuf.RpcCallback;
public class NullCallback<T> implements RpcCallback<T> {
private final static NullCallback instance;
static {
instance = new NullCallback();
}
public static RpcCallback get() {
return instance;
}
@SuppressWarnings("unchecked")
public static <T> RpcCallback<T> get(Class<T> clazz) {
return (RpcCallback<T>)instance;
}
@Override
public void run(T parameter) {
// do nothing
}
}