| /* |
| * 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.samza.system; |
| |
| import org.apache.samza.Partition; |
| |
| /** |
| * Aggregate object representing a both the {@link org.apache.samza.system.SystemStream} and {@link org.apache.samza.Partition}. |
| */ |
| public class SystemStreamPartition extends SystemStream implements Comparable<SystemStreamPartition> { |
| protected final Partition partition; |
| protected final int hash; // precomputed as instances are immutable and often stored in hash-addressed data structures |
| |
| /** |
| * Constructs a Samza stream partition object from specified components. |
| * @param system The name of the system of which this stream is associated with. |
| * @param stream The name of the stream as specified in the stream configuration file. |
| * @param partition The partition in the stream of which this object is associated with. |
| */ |
| public SystemStreamPartition(String system, String stream, Partition partition) { |
| super(system, stream); |
| this.partition = partition; |
| this.hash = computeHashCode(); |
| } |
| |
| /** |
| * Constructs a Samza stream partition object based upon an existing Samza stream partition. |
| * @param other Reference to an already existing Samza stream partition. |
| */ |
| public SystemStreamPartition(SystemStreamPartition other) { |
| this(other.getSystem(), other.getStream(), other.getPartition()); |
| } |
| |
| /** |
| * Constructs a Samza stream partition object based upon another Samza stream and a specified partition. |
| * @param other Reference to an already existing Samza stream. |
| * @param partition Reference to an already existing Samza partition. |
| */ |
| public SystemStreamPartition(SystemStream other, Partition partition) { |
| this(other.getSystem(), other.getStream(), partition); |
| } |
| |
| public Partition getPartition() { |
| return partition; |
| } |
| |
| public SystemStream getSystemStream() { |
| return new SystemStream(system, stream); |
| } |
| |
| @Override |
| public int hashCode() { |
| return hash; |
| } |
| |
| private int computeHashCode() { |
| final int prime = 31; |
| int result = super.hashCode(); |
| result = prime * result + ((partition == null) ? 0 : partition.hashCode()); |
| return result; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) |
| return true; |
| if (!super.equals(obj)) |
| return false; |
| if (getClass() != obj.getClass()) |
| return false; |
| SystemStreamPartition other = (SystemStreamPartition) obj; |
| if (partition == null) { |
| if (other.partition != null) |
| return false; |
| } else if (!partition.equals(other.partition)) |
| return false; |
| return true; |
| } |
| |
| @Override |
| public String toString() { |
| return "SystemStreamPartition [" + system + ", " + stream + ", " + partition.getPartitionId() + "]"; |
| } |
| |
| @Override |
| public int compareTo(SystemStreamPartition that) { |
| if (this.system.compareTo(that.system) < 0) { |
| return -1; |
| } else if (this.system.compareTo(that.system) > 0) { |
| return 1; |
| } |
| |
| if (this.stream.compareTo(that.stream) < 0) { |
| return -1; |
| } else if (this.stream.compareTo(that.stream) > 0) { |
| return 1; |
| } |
| |
| if (this.partition.compareTo(that.partition) < 0) { |
| return -1; |
| } else if (this.partition.compareTo(that.partition) > 0) { |
| return 1; |
| } |
| return 0; |
| } |
| } |