MemoryMessageQueue class

Message queue that sends and receives messages within the same process by using shared memory.

This queue is typically used for testing to mock real queues.

Configuration parameters

  • name: name of the message queue

References

  • *:logger:*:*:1.0 (optional) ILogger components to pass log messages
  • *:counters:*:*:1.0 (optional) ICounters components to pass collected measurements

See MessageQueue See MessagingCapabilities

Example

var queue = MessageQueue("myqueue");

await queue.send("123", MessageEnvelop(null, "mymessage", "ABC"));

var message = await queue.receive("123");
if (message != null) {
   ...
   await queue.complete("123", message);
}
Inheritance

Constructors

MemoryMessageQueue([String? name])
Creates a new instance of the message queue.

Properties

capabilities ↔ MessagingCapabilities
getter/setter pairinherited
connectionResolver ↔ ConnectionResolver
getter/setter pairinherited
counters ↔ CompositeCounters
getter/setter pairinherited
credentialResolver ↔ CredentialResolver
getter/setter pairinherited
hashCode → int
The hash code for this object.
no setterinherited
logger ↔ CompositeLogger
getter/setter pairinherited
name ↔ String
getter/setter pairinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

abandon(MessageEnvelope message) → Future
Returnes message into the queue and makes it available for all subscribers to receive it again. This method is usually used to return a message which could not be processed at the moment to repeat the attempt. Messages that cause unrecoverable errors shall be removed permanently or/and send to dead letter queue.
override
beginListen(String? correlationId, IMessageReceiver receiver) → void
Listens for incoming messages without blocking the current thread.
inherited
checkOpen(String? correlationId) → void
Checks if the queue has been opened and throws an exception is it's not.
inherited
clear(String? correlationId) → Future
Clears component state.
override
close(String? correlationId) → Future
Closes component and frees used resources.
override
complete(MessageEnvelope message) → Future
Permanently removes a message from the queue. This method is usually used to remove the message after successful processing.
override
configure(ConfigParams config) → void
Configures component by passing configuration parameters.
override
endListen(String? correlationId) → void
Ends listening for incoming messages. When this method is call listen unblocks the thread and execution continues.
override
getCapabilities() → MessagingCapabilities
Gets the queue capabilities
inherited
getName() → String
Gets the queue name
inherited
isOpen() → bool
Checks if the component is opened.
override
listen(String? correlationId, IMessageReceiver receiver) → void
Listens for incoming messages and blocks the current thread until queue is closed.
override
moveToDeadLetter(MessageEnvelope message) → Future
Permanently removes a message from the queue and sends it to dead letter queue.
override
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
open(String? correlationId) → Future
Opens the component.
inherited
openWithParams(String? correlationId, ConnectionParams? connection, CredentialParams? credential) → Future
Opens the component with given connection and credential parameters.
override
peek(String? correlationId) → Future<MessageEnvelope?>
Peeks a single incoming message from the queue without removing it. If there are no messages available in the queue it returns null.
override
peekBatch(String? correlationId, int messageCount) → Future<List<MessageEnvelope?>>
Peeks multiple incoming messages from the queue without removing them. If there are no messages available in the queue it returns an empty list.
override
readMessageCount() → Future<int>
Reads the current number of messages in the queue to be delivered.
override
receive(String? correlationId, int waitTimeout) → Future<MessageEnvelope?>
Receives an incoming message and removes it from the queue.
override
renewLock(MessageEnvelope message, int lockTimeout) → Future
Renews a lock on a message that makes it invisible from other receivers in the queue. This method is usually used to extend the message processing time.
override
send(String? correlationId, MessageEnvelope envelope) → Future
Sends a message into the queue.
override
sendAsObject(String? correlationId, String messageType, dynamic message) → Future
Sends an object into the queue. Before sending the object is converted into JSON string and wrapped in a MessageEnvelope.
inherited
setReferences(IReferences references) → void
Sets references to dependent components.
inherited
toString() → String
Gets a string representation of the object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited