de.otto.synapse.endpoint.receiver

Class MessageLogReceiverEndpoint

java.lang.Object

de.otto.synapse.endpoint.MessageEndpoint

de.otto.synapse.endpoint.receiver.MessageReceiverEndpoint

de.otto.synapse.endpoint.receiver.MessageLogReceiverEndpoint

Direct Known Subclasses:

InMemoryChannel

public abstract class MessageLogReceiverEndpoint
extends MessageReceiverEndpoint

Receiver-side MessageEndpoint endpoint of a Message Channel that supports random-access like reading of messages using ChannelPositions.

Constructor Summary

Constructors

Constructor and Description
MessageLogReceiverEndpoint(java.lang.String channelName, com.fasterxml.jackson.databind.ObjectMapper objectMapper)

Method Summary

Modifier and Type	Method and Description
abstract ChannelPosition	consume(ChannelPosition startFrom, java.util.function.Predicate<Message<?>> stopCondition) Takes zero or more messages from the channel, calls MessageEndpoint.intercept(Message) for every message, and notifies the registered consumers with the intercepted message, or drops the message, if intercept returns null.
abstract void	stop()

Methods inherited from class de.otto.synapse.endpoint.receiver.MessageReceiverEndpoint

getMessageDispatcher, register

Methods inherited from class de.otto.synapse.endpoint.MessageEndpoint

getChannelName, intercept, register

Methods inherited from class java.lang.Object

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

Constructor Detail

MessageLogReceiverEndpoint

public MessageLogReceiverEndpoint(@Nonnull
                                  java.lang.String channelName,
                                  @Nonnull
                                  com.fasterxml.jackson.databind.ObjectMapper objectMapper)

Method Detail

consume

@Nonnull
public abstract ChannelPosition consume(@Nonnull
                                                 ChannelPosition startFrom,
                                                 @Nonnull
                                                 java.util.function.Predicate<Message<?>> stopCondition)

Takes zero or more messages from the channel, calls MessageEndpoint.intercept(Message) for every message, and notifies the registered consumers with the intercepted message, or drops the message, if intercept returns null.

Consumption starts with the first message after startFrom and finishes when either the stopCondition is met, or the application is shutting down.

The returned ChannelPosition is the position of the last message that was processed by the MessageLogReceiverEndpoint - whether it was dropped or consumed.

The registered consumers are used as a callback for consumed messages. A MessageDispatcher can be used as a consumer, if multiple consumers, or consumers with message payloads other than String are required.

Parameters:

startFrom - the start position used to proceed message consumption

stopCondition - the predicate used to check if consumption should stop.

Returns:

ChannelResponse

stop

public abstract void stop()