com.hazelcast.client.config

Class ClientReliableTopicConfig

java.lang.Object

com.hazelcast.client.config.ClientReliableTopicConfig

public class ClientReliableTopicConfig
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_READ_BATCH_SIZE The default read batch size.
static TopicOverloadPolicy	DEFAULT_TOPIC_OVERLOAD_POLICY The default slow consumer policy.

Constructor Summary

Constructors

Constructor and Description
ClientReliableTopicConfig(String name) Creates a new ReliableTopicConfig with default settings.

Method Summary

Methods

Modifier and Type	Method and Description
Executor	getExecutor() Gets the Executor that is going to process the events.
String	getName() Gets the name of the reliable topic.
int	getReadBatchSize() Gets the maximum number of items to read in a batch.
TopicOverloadPolicy	getTopicOverloadPolicy() Gets the TopicOverloadPolicy for this reliable topic.
ClientReliableTopicConfig	setExecutor(Executor executor) Sets the Executor that is going to process the event.
ClientReliableTopicConfig	setReadBatchSize(int readBatchSize) Sets the read batch size.
ClientReliableTopicConfig	setTopicOverloadPolicy(TopicOverloadPolicy topicOverloadPolicy) Sets the TopicOverloadPolicy for this reliable topic.
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_READ_BATCH_SIZE

public static final int DEFAULT_READ_BATCH_SIZE

The default read batch size.

See Also:

Constant Field Values

DEFAULT_TOPIC_OVERLOAD_POLICY

public static final TopicOverloadPolicy DEFAULT_TOPIC_OVERLOAD_POLICY

The default slow consumer policy.

Constructor Detail

ClientReliableTopicConfig

public ClientReliableTopicConfig(String name)

Creates a new ReliableTopicConfig with default settings.

Method Detail

getName

public String getName()

Gets the name of the reliable topic.

Returns:

the name of the reliable topic.

getTopicOverloadPolicy

public TopicOverloadPolicy getTopicOverloadPolicy()

Gets the TopicOverloadPolicy for this reliable topic.

Returns:

the TopicOverloadPolicy.

setTopicOverloadPolicy

public ClientReliableTopicConfig setTopicOverloadPolicy(TopicOverloadPolicy topicOverloadPolicy)

Sets the TopicOverloadPolicy for this reliable topic. Check the TopicOverloadPolicy for more details about this setting.

Parameters:

topicOverloadPolicy - the new TopicOverloadPolicy.

Returns:

the updated reliable topic config.

Throws:

IllegalArgumentException - if topicOverloadPolicy is null.

getExecutor

public Executor getExecutor()

Gets the Executor that is going to process the events. If no Executor is selected, then the ExecutionService.ASYNC_EXECUTOR is used.

Returns:

the Executor used to process events.

See Also:

setExecutor(Executor)

setExecutor

public ClientReliableTopicConfig setExecutor(Executor executor)

Sets the Executor that is going to process the event. In some cases it is desirable to set a specific Executor. For example, you may want to isolate a certain topic from other topics because it contains long running messages or very high priority messages. A single Executor can be shared between multiple Reliable topics, although it could take more time to process a message. If a single Executor is not shared with other reliable topics, then the Executor only needs to have a single thread.

Parameters:

executor - the Executor. if the executor is null, the ExecutionService.ASYNC_EXECUTOR will be used to process the event.

Returns:

the updated config.

getReadBatchSize

public int getReadBatchSize()

Gets the maximum number of items to read in a batch. Returned value will always be equal or larger than 1.

Returns:

the read batch size.

setReadBatchSize

public ClientReliableTopicConfig setReadBatchSize(int readBatchSize)

Sets the read batch size. The ReliableTopic tries to read a batch of messages from the ringbuffer. It will get at least one, but if there are more available, then it will try to get more to increase throughput. The minimal read batch size can be influenced using the read batch size. Apart from influencing the number of messages to download, the readBatchSize also determines how many messages will be processed by the thread running the MessageListener before it returns back to the pool to look for other MessageListeners that need to be processed. The problem with returning to the pool and looking for new work is that interacting with an Executor is quite expensive due to contention on the work-queue. The more work that can be done without retuning to the pool, the smaller the overhead. If the readBatchSize is 10 and there are 50 messages available, 10 items are retrieved and processed consecutively before the thread goes back to the pool and helps out with the processing of other messages. If the readBatchSize is 10 and there are 2 items available, 2 items are retrieved and processed consecutively. If the readBatchSize is an issue because a thread will be busy too long with processing a single MessageListener and it can't help out other MessageListeners, increase the size of the threadpool so the other MessageListeners don't need to wait for a thread, but can be processed in parallel.

Parameters:

readBatchSize - the maximum number of items to read in a batch.

Returns:

the updated reliable topic config.

Throws:

IllegalArgumentException - if readBatchSize is smaller than 1.

toString

public String toString()

Overrides:

toString in class Object