org.apache.kafka.common

Class Cluster

java.lang.Object

org.apache.kafka.common.Cluster

public final class Cluster
extends java.lang.Object

A representation of a subset of the nodes, topics, and partitions in the Kafka cluster.

Constructor Summary

Constructors

Constructor and Description
Cluster(java.util.Collection<Node> nodes, java.util.Collection<PartitionInfo> partitions, java.util.Set<java.lang.String> unauthorizedTopics) Create a new cluster with the given nodes and partitions

Method Summary

Methods

Modifier and Type	Method and Description
java.util.List<PartitionInfo>	availablePartitionsForTopic(java.lang.String topic) Get the list of available partitions for this topic
static Cluster	bootstrap(java.util.List<java.net.InetSocketAddress> addresses) Create a "bootstrap" cluster using the given list of host/ports
static Cluster	empty() Create an empty cluster instance with no nodes and no topic-partitions.
Node	leaderFor(TopicPartition topicPartition) Get the current leader for the given topic-partition
Node	nodeById(int id) Get the node by the node id (or null if no such node exists)
java.util.List<Node>	nodes()
PartitionInfo	partition(TopicPartition topicPartition) Get the metadata for the specified partition
java.lang.Integer	partitionCountForTopic(java.lang.String topic) Get the number of partitions for the given topic
java.util.List<PartitionInfo>	partitionsForNode(int nodeId) Get the list of partitions whose leader is this node
java.util.List<PartitionInfo>	partitionsForTopic(java.lang.String topic) Get the list of partitions for this topic
java.util.Set<java.lang.String>	topics() Get all topics.
java.lang.String	toString()
java.util.Set<java.lang.String>	unauthorizedTopics()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Cluster

public Cluster(java.util.Collection<Node> nodes,
       java.util.Collection<PartitionInfo> partitions,
       java.util.Set<java.lang.String> unauthorizedTopics)

Create a new cluster with the given nodes and partitions

Parameters:

nodes - The nodes in the cluster

partitions - Information about a subset of the topic-partitions this cluster hosts

Method Detail

empty

public static Cluster empty()

Create an empty cluster instance with no nodes and no topic-partitions.

bootstrap

public static Cluster bootstrap(java.util.List<java.net.InetSocketAddress> addresses)

Create a "bootstrap" cluster using the given list of host/ports

Parameters:

addresses - The addresses

Returns:

A cluster for these hosts/ports

nodes

public java.util.List<Node> nodes()

Returns:

The known set of nodes

nodeById

public Node nodeById(int id)

Get the node by the node id (or null if no such node exists)

Parameters:

id - The id of the node

Returns:

The node, or null if no such node exists

leaderFor

public Node leaderFor(TopicPartition topicPartition)

Get the current leader for the given topic-partition

Parameters:

topicPartition - The topic and partition we want to know the leader for

Returns:

The node that is the leader for this topic-partition, or null if there is currently no leader

partition

public PartitionInfo partition(TopicPartition topicPartition)

Get the metadata for the specified partition

Parameters:

topicPartition - The topic and partition to fetch info for

Returns:

The metadata about the given topic and partition

partitionsForTopic

public java.util.List<PartitionInfo> partitionsForTopic(java.lang.String topic)

Get the list of partitions for this topic

Parameters:

topic - The topic name

Returns:

A list of partitions

availablePartitionsForTopic

public java.util.List<PartitionInfo> availablePartitionsForTopic(java.lang.String topic)

Get the list of available partitions for this topic

Parameters:

topic - The topic name

Returns:

A list of partitions

partitionsForNode

public java.util.List<PartitionInfo> partitionsForNode(int nodeId)

Get the list of partitions whose leader is this node

Parameters:

nodeId - The node id

Returns:

A list of partitions

partitionCountForTopic

public java.lang.Integer partitionCountForTopic(java.lang.String topic)

Get the number of partitions for the given topic

Parameters:

topic - The topic to get the number of partitions for

Returns:

The number of partitions or null if there is no corresponding metadata

topics

public java.util.Set<java.lang.String> topics()

Get all topics.

Returns:

a set of all topics

unauthorizedTopics

public java.util.Set<java.lang.String> unauthorizedTopics()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object