Messaging

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Messaging

The following examples show how to make JADE agents communicate by exchanging ACL messages

PingAgent
Description:
This example shows an agent able to respond to other agents wishing to know if it is alive. More in details we use a `CyclicBehaviour` that receives only messages of type `QUERY_IF` and using the `presence` ontology. All other messages are ignored. This is acheved by specifying a proper `MessageTemplate`. Whenever such a message is received an `INFORM` message is sent back as reply. In order to run this example, start the JADE runtime (with the management GUI) and launch a PingAgent on it. Then starts the DummyAgent from the JADE management GUI. From the DummyAgent send a message of type `QUERY_IF` with ontology "presence" and "alive" as content to the PingAgent. Use the DummyAgent again to inspect the response. .
Jade classes used:
Agent, ACLMessage, MessageTemplate, CyclicBehaviour
Source
\src\examples\messaging\PingAgent.java

BlockingReceiveAgent
Description:
This example shows how to receive messages in blocking mode by means of the `blockingReceive()` method. Note that this method blocks the whole agent. If you call it from within a behaviour you have to take into account that all other behaviours will not be able to run until the call to `blockingReceive()` returns. In order to run this example, start the JADE runtime (with the management GUI) and launch a BlockingReceiveAgent on it. Then starts the DummyAgent from the JADE management GUI. From the DummyAgent send a message of type `REQUEST` to the BlockingReceiveAgent. Use the DummyAgent again to inspect the response.
Jade classes used:
Agent, ACLMessage, MessageTemplate
Source
\src\examples\messaging\BlockingReceiveAgent.java

CustomTemplateAgent
Description:
This example shows how to create a custom `MessageTemplate`. In this case in particular we define a template matching only REQUEST messages where the ontology starts with "X". In order to run this example, start the JADE runtime (with the management GUI) and launch a CustomTemplateAgent on it. Then starts the DummyAgent from the JADE management GUI. From the DummyAgent send a message of type `REQUEST` to the CustomTemplateAgent specifying a value starting with "X" (e.g. "X-onto") in the `:ontology` slot: the CustomTemplateAgent will catch the message. Then try to send another message with a value not starting with "X" in the ontology field: the CustomTemplateAgent will ignore the message.
Jade classes used:
Agent, ACLMessage, MessageTemplate, MessageTemplate.MatchExpression
Source
\src\examples\messaging\CustomTemplateAgent.java

JADE is a trademark of TILAB (formerly CSELT).
JADE has been developed jointly by TILAB (formerly CSELT) and the Computer Engineering Group of the University of Parma