CDL

Each component used in the solution must be described in the CDL language, in a separate <component name>.cdl file.

A CDL file includes the following sections:

1. The name of the component. The reserved word component is placed before the component name.
2. A list of interface implementations included in the component. Each interface implementation is specified with a separate string in the following format:

   <interface implementation name>:<package name>.<interface name in the package>

   A component can contain several implementations of one interface. All implemented interfaces must be described in the IDL language, in IDL files.

CDL supports single-line comments and multi-line C++-style comments.

Example CDL files

At its simplest, the component contains a single interface implementation similar to the ping component from the echo example.

ping.cdl

/* Component name: ping */

component ping

/* The component contains a named implementation of the IPing interface declared in the ping.idl file. Implementation name: ping_impl.*/

ping_impl: ping.IPing

In the following example, the CoFoo component contains implementations of three interfaces declared in two different packages named Foo and Baz (i.e. in the Foo.idl and Baz.idl files).

CoFoo.cdl

/* Component name: CoFoo */

component CoFoo

/* The component contains an implementation of the IFoo interface declared in the Foo package. Implementation name: foo.*/

foo: Foo.IFoo

/* The component contains an implementation of the IBar interface declared in the Foo package. Implementation name: bar.*/

bar: Foo.IBar

/* The component contains three different implementations of the IBaz interface declared in the Baz package. Names of the implementations: baz1, baz2 and baz3.*/

baz1: Baz.IBaz

baz2: Baz.IBaz

baz3: Baz.IBaz

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