| /** |
| * 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 |
| * <p> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p> |
| * 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.placement; |
| |
| import static com.google.common.base.Charsets.UTF_8; |
| |
| import java.io.IOException; |
| import java.io.UnsupportedEncodingException; |
| import org.apache.commons.lang3.builder.HashCodeBuilder; |
| import org.apache.thrift.TException; |
| import org.apache.thrift.protocol.TJSONProtocol; |
| import org.apache.thrift.transport.TMemoryBuffer; |
| import org.apache.thrift.transport.TMemoryInputTransport; |
| |
| /** |
| * An object represent the load of a stream. |
| * |
| * <p>A comparable data object containing the identifier of the stream and the appraised load produced |
| * by the stream. |
| */ |
| public class StreamLoad implements Comparable { |
| private static final int BUFFER_SIZE = 4096; |
| public final String stream; |
| private final int load; |
| |
| public StreamLoad(String stream, int load) { |
| this.stream = stream; |
| this.load = load; |
| } |
| |
| public int getLoad() { |
| return load; |
| } |
| |
| public String getStream() { |
| return stream; |
| } |
| |
| protected com.twitter.distributedlog.service.placement.thrift.StreamLoad toThrift() { |
| com.twitter.distributedlog.service.placement.thrift.StreamLoad tStreamLoad = |
| new com.twitter.distributedlog.service.placement.thrift.StreamLoad(); |
| return tStreamLoad.setStream(stream).setLoad(load); |
| } |
| |
| public byte[] serialize() throws IOException { |
| TMemoryBuffer transport = new TMemoryBuffer(BUFFER_SIZE); |
| TJSONProtocol protocol = new TJSONProtocol(transport); |
| try { |
| toThrift().write(protocol); |
| transport.flush(); |
| return transport.toString(UTF_8.name()).getBytes(UTF_8); |
| } catch (TException e) { |
| throw new IOException("Failed to serialize stream load : ", e); |
| } catch (UnsupportedEncodingException uee) { |
| throw new IOException("Failed to serialize stream load : ", uee); |
| } |
| } |
| |
| public static StreamLoad deserialize(byte[] data) throws IOException { |
| com.twitter.distributedlog.service.placement.thrift.StreamLoad tStreamLoad = |
| new com.twitter.distributedlog.service.placement.thrift.StreamLoad(); |
| TMemoryInputTransport transport = new TMemoryInputTransport(data); |
| TJSONProtocol protocol = new TJSONProtocol(transport); |
| try { |
| tStreamLoad.read(protocol); |
| return new StreamLoad(tStreamLoad.getStream(), tStreamLoad.getLoad()); |
| } catch (TException e) { |
| throw new IOException("Failed to deserialize stream load : ", e); |
| } |
| } |
| |
| @Override |
| public int compareTo(Object o) { |
| StreamLoad other = (StreamLoad) o; |
| if (load == other.getLoad()) { |
| return stream.compareTo(other.getStream()); |
| } else { |
| return Long.compare(load, other.getLoad()); |
| } |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (!(o instanceof StreamLoad)) { |
| return false; |
| } |
| StreamLoad other = (StreamLoad) o; |
| return stream.equals(other.getStream()) && load == other.getLoad(); |
| } |
| |
| @Override |
| public String toString() { |
| return String.format("StreamLoad<Stream: %s, Load: %d>", stream, load); |
| } |
| |
| @Override |
| public int hashCode() { |
| return new HashCodeBuilder().append(stream).append(load).build(); |
| } |
| } |