org.camunda.bpm.engine.impl.externaltask
Class ExternalTaskQueryBuilderImpl

java.lang.Object
  org.camunda.bpm.engine.impl.externaltask.ExternalTaskQueryBuilderImpl

All Implemented Interfaces:

ExternalTaskQueryBuilder

public class ExternalTaskQueryBuilderImpl
extends Object
implements ExternalTaskQueryBuilder

Author:

Thorben Lindhauer

Field Summary

protected CommandExecutor	commandExecutor
protected Map<String,TopicFetchInstruction>	instructions
protected int	maxTasks
protected String	workerId

Constructor Summary

ExternalTaskQueryBuilderImpl(CommandExecutor commandExecutor, String workerId, int maxTasks)

Method Summary

void	addInstruction(TopicFetchInstruction instruction)
List<LockedExternalTask>	execute() Performs the fetching.
ExternalTaskQueryTopicBuilder	topic(String topicName, long lockDuration) Specifies that tasks of a topic should be fetched and locked for a certain amount of time

Methods inherited from class java.lang.Object

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

Field Detail

commandExecutor

protected CommandExecutor commandExecutor

workerId

protected String workerId

maxTasks

protected int maxTasks

instructions

protected Map<String,TopicFetchInstruction> instructions

Constructor Detail

ExternalTaskQueryBuilderImpl

public ExternalTaskQueryBuilderImpl(CommandExecutor commandExecutor,
                                    String workerId,
                                    int maxTasks)

Method Detail

topic

public ExternalTaskQueryTopicBuilder topic(String topicName,
                                           long lockDuration)

Description copied from interface: ExternalTaskQueryBuilder

Specifies that tasks of a topic should be fetched and locked for a certain amount of time

Specified by:

topic in interface ExternalTaskQueryBuilder

Parameters:

topicName - the name of the topic

lockDuration - the duration in milliseconds for which tasks should be locked; begins at the time of fetching

Returns:

execute

public List<LockedExternalTask> execute()

Description copied from interface: ExternalTaskQueryBuilder

Performs the fetching. Locks candidate tasks of the given topics for the specified duration.

Specified by:

execute in interface ExternalTaskQueryBuilder

Returns:

fetched external tasks that match the topic and that can be successfully locked

addInstruction

public void addInstruction(TopicFetchInstruction instruction)