de.otto.synapse.messagestore

Class CompactingConcurrentMapMessageStore

java.lang.Object

de.otto.synapse.messagestore.CompactingConcurrentMapMessageStore

All Implemented Interfaces:

MessageStore, WritableMessageStore, java.lang.AutoCloseable

@ThreadSafe
public class CompactingConcurrentMapMessageStore
extends java.lang.Object
implements WritableMessageStore

Concurrent implementation of a MessageStore that is compacting messages by of.

The ordering of messages is guaranteed by using a (on-heap) ConcurrentSkipListSet for keys.

The messages are stored in a ConcurrentMap like, for example, ChronicleMap. This way, the messages can be stored off-heap, so large numbers of messages can be stored in memory, without getting problems with Java garbage-collecting.

Constructor Summary

Constructors

Constructor and Description
CompactingConcurrentMapMessageStore()
CompactingConcurrentMapMessageStore(boolean removeNullPayloadMessages)
CompactingConcurrentMapMessageStore(boolean removeNullPayloadMessages, java.util.concurrent.ConcurrentMap<java.lang.String,TextMessage> messageMap)

Method Summary

Modifier and Type	Method and Description
void	add(TextMessage message) Adds a Message to the MessageStore.
ChannelPosition	getLatestChannelPosition() Returns the latest ChannelPosition of the MessageStore.
int	size() Returns the number of messages contained in the MessageStore.
java.util.stream.Stream<TextMessage>	stream() Returns a Stream of messages contained in the MessageStore.

Methods inherited from class java.lang.Object

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

Methods inherited from interface de.otto.synapse.messagestore.MessageStore

close

Constructor Detail

CompactingConcurrentMapMessageStore

public CompactingConcurrentMapMessageStore()

CompactingConcurrentMapMessageStore

public CompactingConcurrentMapMessageStore(boolean removeNullPayloadMessages)

CompactingConcurrentMapMessageStore

public CompactingConcurrentMapMessageStore(boolean removeNullPayloadMessages,
                                           java.util.concurrent.ConcurrentMap<java.lang.String,TextMessage> messageMap)

Method Detail

add

public void add(TextMessage message)

Description copied from interface: WritableMessageStore

Adds a Message to the MessageStore.

Specified by:

add in interface WritableMessageStore

Parameters:

message - the message to add

getLatestChannelPosition

public ChannelPosition getLatestChannelPosition()

Description copied from interface: MessageStore

Returns the latest ChannelPosition of the MessageStore.

The position is calculated by merging the optional positions of the messages.

Messages without positions will not change the latest ChannelPosition. If no message contains position information, the returned ChannelPosition is ChannelPosition.fromHorizon()

Specified by:

getLatestChannelPosition in interface MessageStore

Returns:

ChannelPosition

stream

public java.util.stream.Stream<TextMessage> stream()

Description copied from interface: MessageStore

Returns a Stream of messages contained in the MessageStore.

The stream will maintain the insertion order of the messages.

Specified by:

stream in interface MessageStore

Returns:

Stream of messages

size

public int size()

Description copied from interface: MessageStore

Returns the number of messages contained in the MessageStore.

Primarily used for testing purposes. If the MessageStore can not implement this without major performance impacts (like, for example, having to download and parse huge files from S3), the method is not required to be implemented.

Specified by:

size in interface MessageStore

Returns:

number of messages