The RemoteJ Compiler/Generator Implementation - Autonomics Development: A Domain-Specific Aspect Language Approach - page 87

Table 5.2. JMS generated output files.

Type Name Purpose

Client Files ClockDate.class The client class file that connects to the re-

mote service getDate() accessed via the
generated JMSServer class

JMSClient.class The RemoteJ generated JMS client helper

class

Server Files JMSServer.class The server class file that delegates remote

calls to the ClockDate.getDate() method

used by the nextServer statement to connect to an alternative server in
the event of a communication or distribution error. This may be overrid-
den by the remotej.servers command line option. If neither servers nor
remotej.servers have been defined, the application will terminate.
serverThreads. The number of server threads to create in the JMS container.
receiveTimeout. The period to wait for a message response. In addition, the JMS
time-to-live field is set to the receiveTimeout value to ensure stale messages
are removed from the queue (if supported by the JMS implementation).
serverPlugin. This optional statement is used to add a user-defined class to be
started in a thread in the server-generated code. It is provided to allow for
advanced user-defined recovery scenarios as described in Section 5.3.
Given a DDL with the single pointcut statement illustrated in Figure 5.8 the
classes in Table 5.2 are generated.
In contrast to the complexity of the RMI implementation, the JMS imple-
mentation contains only two code generation phases, the client and the server
generation phases.

5.5.2 JMS Client Generation

The JMS client generation phase performs the same checks as described for the
RMI implementation to ensure that methods matched by statements defined in
the DDL are not defined as synchronized or contain synchronized blocks of code.
Client methods matched in the DDL are replaced with method calls that:
• Create an instance of the Transfer object, described in Section 5.3.
• Call various Transfer object methods to set the name of the class and the
associated method to be executed, the method's parameter names, and the
method's parameter values.
• Use the RemoteJ JMSClient helper class to transmit the Transfer object
from the client to the server using the JMS ObjectMessage message type.
On the server, the values contained in the Transfer object are used to call
the requested method using the following process.