| /** |
| * 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 com.twitter.distributedlog.service.streamset; |
| |
| import com.google.common.base.Objects; |
| |
| /** |
| * `Partition` defines the relationship between a `virtual` stream and a |
| * physical DL stream. |
| * |
| * <p>A `virtual` stream could be partitioned into multiple partitions |
| * and each partition is effectively a DL stream. |
| */ |
| public class Partition { |
| |
| // Name of its parent stream. |
| private final String stream; |
| |
| // Unique id of the partition within the stream. |
| // It can be just simply an index id. |
| public final int id; |
| |
| public Partition(String stream, int id) { |
| this.stream = stream; |
| this.id = id; |
| } |
| |
| /** |
| * Get the `virtual` stream name. |
| * |
| * @return the stream name. |
| */ |
| public String getStream() { |
| return stream; |
| } |
| |
| /** |
| * Get the partition id of this partition. |
| * |
| * @return partition id |
| */ |
| public int getId() { |
| return id; |
| } |
| |
| /** |
| * Get the 6 digit 0 padded id of this partition as a String. |
| * @return partition id |
| */ |
| public String getPaddedId() { |
| return String.format("%06d", getId()); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } |
| if (!(o instanceof Partition)) { |
| return false; |
| } |
| Partition partition = (Partition) o; |
| |
| return id == partition.id && Objects.equal(stream, partition.stream); |
| } |
| |
| @Override |
| public int hashCode() { |
| int result = stream.hashCode(); |
| result = 31 * result + id; |
| return result; |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder sb = new StringBuilder(); |
| sb.append("Partition(") |
| .append(stream) |
| .append(", ") |
| .append(id) |
| .append(")"); |
| return sb.toString(); |
| } |
| } |