Package org.springframework.integration.channel

Class PriorityChannel

java.lang.Object

org.springframework.integration.context.IntegrationObjectSupport

org.springframework.integration.channel.AbstractMessageChannel

org.springframework.integration.channel.AbstractPollableChannel

org.springframework.integration.channel.QueueChannel

org.springframework.integration.channel.PriorityChannel

All Implemented Interfaces:

Aware, BeanFactoryAware, BeanNameAware, DisposableBean, InitializingBean, ApplicationContextAware, ExecutorChannelInterceptorAware, QueueChannelOperations, ExpressionCapable, IntegrationPattern, NamedComponent, IntegrationManagement, TrackableComponent, MessageChannel, PollableChannel, InterceptableChannel

public class PriorityChannel
extends QueueChannel

A message channel that prioritizes messages based on a Comparator. The default comparator is based upon the message header's 'priority'.

Author:

Mark Fisher, Oleg Zhurakousky, Gary Russell, Artem Bilan

Nested Class Summary

Nested classes/interfaces inherited from class org.springframework.integration.channel.AbstractMessageChannel

AbstractMessageChannel.ChannelInterceptorList

Nested classes/interfaces inherited from interface org.springframework.integration.support.management.IntegrationManagement

IntegrationManagement.ManagementOverrides

Field Summary

Fields inherited from class org.springframework.integration.channel.QueueChannel

queueSemaphore

Fields inherited from class org.springframework.integration.channel.AbstractMessageChannel

interceptors, meters

Fields inherited from class org.springframework.integration.context.IntegrationObjectSupport

EXPRESSION_PARSER, logger

Fields inherited from interface org.springframework.integration.support.management.IntegrationManagement

METER_PREFIX, RECEIVE_COUNTER_NAME, SEND_TIMER_NAME

Fields inherited from interface org.springframework.messaging.MessageChannel

INDEFINITE_TIMEOUT

Constructor Summary

Constructors

Constructor	Description
PriorityChannel()	Create a channel with an unbounded queue.
PriorityChannel(int capacity)	Create a channel with the specified queue capacity.
PriorityChannel(int capacity, Comparator<Message<?>> comparator)	Create a channel with the specified queue capacity.
PriorityChannel(Comparator<Message<?>> comparator)	Create a channel with an unbounded queue.
PriorityChannel(MessageGroupQueue messageGroupQueue)	Create a channel based on the provided MessageGroupQueue.
PriorityChannel(PriorityCapableChannelMessageStore messageGroupStore, Object groupId)	Create a channel based on the provided PriorityCapableChannelMessageStore and group id for message store operations.

Method Summary

Modifier and Type	Method	Description
protected Message<?>	doReceive(long timeout)	Subclasses must implement this method.
protected boolean	doSend(Message<?> message, long timeout)	Subclasses must implement this method.
int	getRemainingCapacity()	Obtain the remaining capacity of this channel.

Methods inherited from class org.springframework.integration.channel.QueueChannel

clear, destroy, getQueueSize, purge, registerMetricsCaptor

Methods inherited from class org.springframework.integration.channel.AbstractPollableChannel

addInterceptor, addInterceptor, getIntegrationPatternType, hasExecutorInterceptors, receive, receive, removeInterceptor, removeInterceptor, setInterceptors

Methods inherited from class org.springframework.integration.channel.AbstractMessageChannel

getComponentType, getFullChannelName, getIChannelInterceptorList, getInterceptors, getMetricsCaptor, getOverrides, isLoggingEnabled, onInit, send, send, setDatatypes, setLoggingEnabled, setMessageConverter, setShouldTrack

Methods inherited from class org.springframework.integration.context.IntegrationObjectSupport

afterPropertiesSet, extractTypeIfPossible, generateId, getApplicationContext, getApplicationContextId, getBeanDescription, getBeanFactory, getBeanName, getChannelResolver, getComponentName, getConversionService, getExpression, getIntegrationProperties, getIntegrationProperty, getMessageBuilderFactory, getTaskScheduler, isInitialized, setApplicationContext, setBeanFactory, setBeanName, setChannelResolver, setComponentName, setConversionService, setMessageBuilderFactory, setPrimaryExpression, setTaskScheduler, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.springframework.integration.support.management.IntegrationManagement

getManagedName, getManagedType, getThisAs, setManagedName, setManagedType

Methods inherited from interface org.springframework.messaging.support.InterceptableChannel

getInterceptors

Methods inherited from interface org.springframework.messaging.MessageChannel

send, send

Methods inherited from interface org.springframework.integration.support.context.NamedComponent

getBeanName, getComponentName

Constructor Details

PriorityChannel

public PriorityChannel()

Create a channel with an unbounded queue. Message priority will be based on the value of StaticMessageHeaderAccessor.getPriority(Message).

PriorityChannel

public PriorityChannel(int capacity)

Create a channel with the specified queue capacity. Message priority will be based upon the value of StaticMessageHeaderAccessor.getPriority(Message).

Parameters:

capacity - The queue capacity.

PriorityChannel

public PriorityChannel(Comparator<Message<?>> comparator)

Create a channel with an unbounded queue. Message priority will be determined by the provided Comparator. If the comparator is null, the priority will be based upon the value of StaticMessageHeaderAccessor.getPriority(Message).

Parameters:

comparator - The comparator.

PriorityChannel

public PriorityChannel(int capacity, @Nullable Comparator<Message<?>> comparator)

Create a channel with the specified queue capacity. If the capacity is a non-positive value, the queue will be unbounded. Message priority will be determined by the provided Comparator. If the comparator is null, the priority will be based upon the value of StaticMessageHeaderAccessor.getPriority(Message).

Parameters:

capacity - The capacity.

comparator - The comparator.

PriorityChannel

public PriorityChannel(PriorityCapableChannelMessageStore messageGroupStore, Object groupId)

Create a channel based on the provided PriorityCapableChannelMessageStore and group id for message store operations.

Parameters:

messageGroupStore - the PriorityCapableChannelMessageStore to use.

groupId - to group message for this channel in the message store.

Since:

5.0

PriorityChannel

public PriorityChannel(MessageGroupQueue messageGroupQueue)

Create a channel based on the provided MessageGroupQueue.

Parameters:

messageGroupQueue - the MessageGroupQueue to use.

Since:

5.0

Method Details

getRemainingCapacity

public int getRemainingCapacity()

Description copied from interface: QueueChannelOperations

Obtain the remaining capacity of this channel.

Specified by:

getRemainingCapacity in interface QueueChannelOperations

Overrides:

getRemainingCapacity in class QueueChannel

Returns:

The remaining capacity of this channel.

doSend

protected boolean doSend(Message<?> message, long timeout)

Description copied from class: AbstractMessageChannel

Subclasses must implement this method. A non-negative timeout indicates how long to wait if the channel is at capacity (if the value is 0, it must return immediately with or without success). A negative timeout value indicates that the method should block until either the message is accepted or the blocking thread is interrupted.

Overrides:

doSend in class QueueChannel

Parameters:

message - The message.

timeout - The timeout.

Returns:

true if the send was successful.

doReceive

protected Message<?> doReceive(long timeout)

Description copied from class: AbstractPollableChannel

Subclasses must implement this method. A non-negative timeout indicates how long to wait if the channel is empty (if the value is 0, it must return immediately with or without success). A negative timeout value indicates that the method should block until either a message is available or the blocking thread is interrupted.

Overrides:

doReceive in class QueueChannel

Parameters:

timeout - The timeout.

Returns:

The message, or null.