XLANG-s Statements

Artikkeli
02/02/2021

XLANG/s statements generally fall into one of two categories: simple statements that act on their own, such as receive or send, and complex statements that contain or group either simple statements or other complex statements, such as scope, parallel, and listen. Each statement is corresponding to an orchestration shape in the BizTalk Orchestration Designer. XLANG/s defines the following statements:

group. Used to group operations into a single collapsible and expandable unit for visual convenience.
send. Used to send a specified message to a specified port.
receive. Used to wait for the receipt of a specified message from a specified port.
port. Defines where and how messages are transmitted.
role link. Used to create a collection of ports that communicate with the same logical partner, perhaps through different transports or endpoints
transform. Used to map the fields from existing messages into new messages.
message assignment. Used to send a specified message to a specified port.
construct message. Defines a block of XLANG/s code where a message is created and initialized. Existing messages can be sent to an XLANG/s program, but cannot be created outside of a construct. This mechanism provides for message distribution and rich message tracking, because a message state is known at all times.
call orchestration. Synchronously calls from one orchestration to another orchestration. Parameters can be passed and returned.
start orchestration. Used to enable your orchestration to call another orchestration asynchronously.
call rules. Enables you to configure a Business Rules policy to be executed in your orchestration.
expression. XLANG/s supports rich expression syntax to support the wide variety of usage scenarios required for protocol definition. This statement is used to assign port properties, service-link properties, messages, variables, and objects, and to invoke methods, properties, or static data fields.
decide. Used to conditionally execute one of several paths of execution, depending on the value of its associated conditions.
delay. Used to wait until an absolute time is reached or a relative time is reached.
listen. As with a parallel statement, the listen statement has multiple paths of execution branches. However, the branches must begin with a delay statement or a receive statement. The branch that receives the first invocation is executed. The other branches of the listen statement are never executed.
parallel actions. Executes multiple branches of a business process concurrently. All branches must complete processing before any statements following the parallel statement are executed.
loop. Repeatedly executes while its associated condition remains true.
scope. Provides a context for a block of code that defines variables and transactional semantics that apply to that block of code. Variable lifetime can be restricted to that scope. Transactional semantics, such as long-running, atomic, or none can be applied to a scope to affect its behavior.
throw exception. Used to explicitly invoke an exception/fault handler in the current code block.
compensate. Used to explicitly invoke a compensation block associated with a given scope. A scope statement may have one or more compensation blocks associated with it. The compensate statement directs execution to the selected compensation block.
suspend. Temporarily halts execution of a process, but can be restarted by an operator or application. A string expression associated with the terminate statement is made available to operators/administrators through appropriate logs or through a user interface.
terminate. Forcibly and irrevocably stops all processing in a schedule. A string expression associated with the terminate statement is made available to operators and administrators through appropriate logs or through a user interface.

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XLANG-s Statements

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