| /* |
| * 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.drill.exec.coord.store; |
| |
| import com.google.common.base.Objects; |
| import com.google.common.base.Preconditions; |
| |
| /** |
| * Represents an event created as a result of an operation over a particular (key, value) entry in a |
| * {@link TransientStore store} instance. |
| * |
| * Types of operations are enumerated in {@link TransientStoreEventType} |
| * |
| * @param <V> value type |
| */ |
| public class TransientStoreEvent<V> { |
| private final TransientStoreEventType type; |
| private final String key; |
| private final V value; |
| |
| public TransientStoreEvent(final TransientStoreEventType type, final String key, final V value) { |
| this.type = Preconditions.checkNotNull(type); |
| this.key = Preconditions.checkNotNull(key); |
| this.value = Preconditions.checkNotNull(value); |
| } |
| |
| public String getKey() { |
| return key; |
| } |
| |
| public TransientStoreEventType getType() { |
| return type; |
| } |
| |
| public V getValue() { |
| return value; |
| } |
| |
| @Override |
| public boolean equals(final Object obj) { |
| if (obj instanceof TransientStoreEvent && obj.getClass().equals(getClass())) { |
| @SuppressWarnings("unchecked") |
| final TransientStoreEvent<V> other = (TransientStoreEvent<V>) obj; |
| return Objects.equal(type, other.type) && Objects.equal(key, other.key) && Objects.equal(value, other.value); |
| } |
| return super.equals(obj); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hashCode(type, key, value); |
| } |
| |
| public static <T> TransientStoreEvent<T>of(final TransientStoreEventType type, final String key, final T value) { |
| return new TransientStoreEvent<>(type, key, value); |
| } |
| } |