/*
* 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.kafka.streams.state;
import org.apache.kafka.common.TopicPartition;
import org.apache.kafka.streams.KafkaStreams;
import java.util.Collections;
import java.util.Set;
/**
* Represents the state of an instance (process) in a {@link KafkaStreams} application.
* It contains the user supplied {@link HostInfo} that can be used by developers to build
* APIs and services to connect to other instances, the Set of state stores available on
* the instance and the Set of {@link TopicPartition}s available on the instance.
* NOTE: This is a point in time view. It may change when rebalances happen.
*/
public class StreamsMetadata {
/**
* Sentinel to indicate that the StreamsMetadata is currently unavailable. This can occur during rebalance
* operations.
*/
public final static StreamsMetadata NOT_AVAILABLE = new StreamsMetadata(new HostInfo("unavailable", -1),
Collections.<String>emptySet(),
Collections.<TopicPartition>emptySet());
private final HostInfo hostInfo;
private final Set<String> stateStoreNames;
private final Set<TopicPartition> topicPartitions;
public StreamsMetadata(final HostInfo hostInfo,
final Set<String> stateStoreNames,
final Set<TopicPartition> topicPartitions) {
this.hostInfo = hostInfo;
this.stateStoreNames = stateStoreNames;
this.topicPartitions = topicPartitions;
}
public HostInfo hostInfo() {
return hostInfo;
}
public Set<String> stateStoreNames() {
return stateStoreNames;
}
public Set<TopicPartition> topicPartitions() {
return topicPartitions;
}
public String host() {
return hostInfo.host();
}
public int port() {
return hostInfo.port();
}
@Override
public boolean equals(final Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
final StreamsMetadata that = (StreamsMetadata) o;
if (!hostInfo.equals(that.hostInfo)) return false;
if (!stateStoreNames.equals(that.stateStoreNames)) return false;
return topicPartitions.equals(that.topicPartitions);
}
@Override
public int hashCode() {
int result = hostInfo.hashCode();
result = 31 * result + stateStoreNames.hashCode();
result = 31 * result + topicPartitions.hashCode();
return result;
}
@Override
public String toString() {
return "StreamsMetadata{" +
"hostInfo=" + hostInfo +
", stateStoreNames=" + stateStoreNames +
", topicPartitions=" + topicPartitions +
'}';
}
}