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/*
* 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.internals;
import org.apache.kafka.common.TopicPartition;
import org.apache.kafka.streams.KafkaStreams;
import org.apache.kafka.streams.StreamsMetadata;
import org.apache.kafka.streams.state.HostInfo;
import java.util.Collections;
import java.util.Objects;
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* NOTE: This is a point in time view.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 StreamsMetadataImpl implements StreamsMetadata {
private final HostInfo hostInfo;
private final Set stateStoreNames;
private final Set topicPartitions;
private final Set standbyStateStoreNames;
private final Set standbyTopicPartitions;
private final String topologyName;
public StreamsMetadataImpl(final HostInfo hostInfo,
final Set stateStoreNames,
final Set topicPartitions,
final Set standbyStoreNames,
final Set standbyTopicPartitions) {
this(
hostInfo,
stateStoreNames,
topicPartitions,
standbyStoreNames,
standbyTopicPartitions,
null
);
}
public StreamsMetadataImpl(final HostInfo hostInfo,
final Set stateStoreNames,
final Set topicPartitions,
final Set standbyStoreNames,
final Set standbyTopicPartitions,
final String topologyName) {
this.hostInfo = hostInfo;
this.stateStoreNames = Collections.unmodifiableSet(stateStoreNames);
this.topicPartitions = Collections.unmodifiableSet(topicPartitions);
this.standbyTopicPartitions = Collections.unmodifiableSet(standbyTopicPartitions);
this.standbyStateStoreNames = Collections.unmodifiableSet(standbyStoreNames);
this.topologyName = topologyName;
}
/**
* The value of {@link org.apache.kafka.streams.StreamsConfig#APPLICATION_SERVER_CONFIG} configured for the streams
* instance, which is typically host/port
*
* @return {@link HostInfo} corresponding to the streams instance
*/
@Override
public HostInfo hostInfo() {
return hostInfo;
}
/**
* State stores owned by the instance as an active replica
*
* @return set of active state store names
*/
@Override
public Set stateStoreNames() {
return stateStoreNames;
}
/**
* Topic partitions consumed by the instance as an active replica
*
* @return set of active topic partitions
*/
@Override
public Set topicPartitions() {
return topicPartitions;
}
/**
* (Source) Topic partitions for which the instance acts as standby.
*
* @return set of standby topic partitions
*/
@Override
public Set standbyTopicPartitions() {
return standbyTopicPartitions;
}
/**
* State stores owned by the instance as a standby replica
*
* @return set of standby state store names
*/
@Override
public Set standbyStateStoreNames() {
return standbyStateStoreNames;
}
@Override
public String host() {
return hostInfo.host();
}
@SuppressWarnings("unused")
@Override
public int port() {
return hostInfo.port();
}
public String topologyName() {
return topologyName;
}
@Override
public boolean equals(final Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
final StreamsMetadataImpl that = (StreamsMetadataImpl) o;
return Objects.equals(hostInfo, that.hostInfo)
&& Objects.equals(stateStoreNames, that.stateStoreNames)
&& Objects.equals(topicPartitions, that.topicPartitions)
&& Objects.equals(standbyStateStoreNames, that.standbyStateStoreNames)
&& Objects.equals(standbyTopicPartitions, that.standbyTopicPartitions)
&& Objects.equals(topologyName, that.topologyName);
}
@Override
public int hashCode() {
return Objects.hash(hostInfo, stateStoreNames, topicPartitions, standbyStateStoreNames, standbyTopicPartitions);
}
@Override
public String toString() {
final String str =
"StreamsMetadata {" +
"hostInfo=" + hostInfo +
", stateStoreNames=" + stateStoreNames +
", topicPartitions=" + topicPartitions +
", standbyStateStoreNames=" + standbyStateStoreNames +
", standbyTopicPartitions=" + standbyTopicPartitions;
if (topologyName == null) {
return str + '}';
} else {
return str +
", topologyName=" + topologyName +
'}';
}
}
}
