Habari Client for ActiveMQ is a high-level, object-oriented STOMP client library for Delphi and Free Pascal which provides access to the Apache ActiveMQ free open source Message Broker.
language
With this library, developers can build integrated solutions, connecting cross language clients and protocols, using the peer-to-peer or the publish-and-subscribe communication model.favorite_border
It is easy to configure and provides a high-level API and programming model, based on connections, sessions, destinations, message producers, and message consumers.filter_list
The library uses the STOMP protocol for its communication with the message broker. Supported STOMP protocol version levels are 1.0, 1.1 and 1.2.Habari Client libraries support several broker-specific extensions of the STOMP protocol standard. Please note that library support for broker-specific extensions may be limited or incompatible across clients and broker versions.
timer
By default, a message never expires. If a message will become obsolete after a certain period, however, you may want to set an expiration time for the message.
traffic
A client can specify a priority for each message it sends. Message priorities affect the order in which the messages are delivered to the consumers.
storage
Brokers support reliable messaging by allowing messages to be persisted so that they can be recovered if there is failure which kills the broker.
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Even if the client which created the durable subscription is not online, he can still get a copy of all the messages sent to the topic when he comes back online.
import_export
Binary and text messages can be exchanged between STOMP and non-STOMP clients. (Object and map messages are exchanged as text messages)
sync
Temporary destinations are typically used to receive response messages in a request/response messaging exchange. (Not supported by Apache ActiveMQ Artemis)
list
If you want to browse all the messages on a queue in a non-destructive fashion, you can create a browsing subscription. (Only supported by Apache ActiveMQ and Artemis)
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Message selectors allow a subscription to only receive a subset of the messages sent to a destination. (Not supported by RabbitMQ)
Released 21 April 2021
Read the "Getting Started" user guide for Habari Client for ActiveMQ
Browse the online API documentation for Habari Client for ActiveMQ
Browse release notes (new features, enhancements, and bug fixes)
Frequently asked questions: use cases, licensing, and technical
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Submit a bug report
Code for sending (producing) and receiving (consuming) messages:
procedure TNewApiTests.TestSendMessage;
var
Factory: IConnectionFactory;
Context: IMQContext;
Destination: IQueue;
Producer: IMQProducer;
Consumer: IMQConsumer;
TextMessage: ITextMessage;
begin
Factory := TBTConnectionFactory.Create;
Context := Factory.CreateContext;
try
Destination := Context.CreateQueue(GetQueueName);
Producer := Context.CreateProducer;
Producer.Send(Destination, 'Hello World');
Consumer := Context.CreateConsumer(Destination);
TextMessage := Consumer.Receive(2500) as ITextMessage;
CheckEquals('Hello World', TextMessage.Text);
finally
Context.Close;
end;
end;
Code for sending (producing) messages:
// Getting connection from the server and starting it ConnectionFactory := TBTConnectionFactory.Create; try Connection := ConnectionFactory.CreateConnection; Connection.Start; // Messages are sent and received using a Session. We will // create here a non-transactional session object. If you want // to use transactions you should set the first parameter to 'true' Session := Connection.CreateSession(False, amAutoAcknowledge); // Destination represents here our queue 'ExampleQueue' on the // server. You don't have to do anything special on the // server to create it, it will be created automatically. Destination := Session.CreateQueue('ExampleQueue'); // MessageProducer is used for sending messages (as opposed // to MessageConsumer which is used for receiving them) Producer := Session.CreateProducer(Destination); // We will send a small TextMessage saying 'My hovercraft is full of eels' in Mandarin: TextMessage := Session.CreateTextMessage("我的氣墊船裝滿了鱔魚"); // Here we are sending the message Producer.Send(Message); finally Connection.Close; end;
Code for receiving (consuming) messages:
// Getting connection from the server and starting it
ConnectionFactory := TBTConnectionFactory.Create;
try
Connection := ConnectionFactory.CreateConnection;
Connection.Start;
// Messages are sent and received using a Session. We will
// create here a non-transactional session object. If you want
// to use transactions you should set the first parameter to 'true'
Session := Connection.CreateSession(False, amAutoAcknowledge);
// Destination represents here our queue 'ExampleQueue' on the
// server. You don't have to do anything special on the
// server to create it, it will be created automatically.
Destination := Session.CreateQueue('ExampleQueue');
// MessageConsumer is used for receiving messages (as opposed
// to MessageProducer which is used for sending them)
Consumer := Session.CreateConsumer(Destination);
// We will try to receive send a TextMessage within 5 seconds:
TextMessage := Consumer.Receive(5000);
WriteLn(TextMessage.Text);
finally
Connection.Close;
end;
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Apache ActiveMQ™ is a popular and powerful open source messaging and Integration Patterns server.
Apache ActiveMQ is fast, supports many Cross Language Clients and Protocols, comes with easy to use Enterprise Integration Patterns and many advanced features while fully supporting JMS 1.1 and J2EE 1.4. Apache ActiveMQ is released under the Apache 2.0 License
https://activemq.apache.org/