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1231 Overview of the Language
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The IDL defines many language constructs, allowing a rich schema of objects to be described We'll cover each of the basic ones, but readers are advised to read the "Java Language Mapping to OMG IDL Specification," published by the Object Management Group NOTE The IDL documentation is available from the OMG Web site, at http://wwwomgorg/technology/documents/formal/java_language_mapping_to_omg_idlhtm If the page has moved from this location, you can access it from the main OMG site at http://wwwomgorg/, by searching for "Java Language Mapping to OMG IDL"
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1232 IDL Datatypes
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IDL defines a set of primitive datatypes, such as numbers and text, as well as the ability to create more powerful constructs like arrays, sequences, and data structures Readers interested in the more complex constructs are advised to consult the "Java Language Mapping to OMG IDL Specification" document, on which Table 12-1, showing the basic IDL datatypes, is based
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1233 IDL Interfaces
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Interface definitions describe a remote object, the methods that the object exposes, as well as member variables, such as constants The interface keyword is used to describe an interface The following is an example of an interface:
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interface UserAccount { float getBalance(); void setBalance(in float amount); };
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1234 IDL Modules
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Modules are a convenient way of grouping logically related interfaces together for convenience Consider modules similar to a package in Java; related classes are grouped together into categories Table 12-1 Java Datatypes and Their Mapping to IDL Datatypes Java Datatype IDL Datatype void Void boolean Boolean wchar Char octet Byte short Short long Int long long Long float Float double Double string / wstring javalangString
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module AccountTypes { interface UserAccount { // code for account would go here }; interface UserID { // code for userid would go here }; interface Subscriptions { // code for subscriptions would go here } }
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1235 IDL Attributes
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Interfaces can have variables, as well as providing member variables While you can write accessor functions to obtain the value of a variable and/or modify it, an easier alternative is to define an attribute Attributes may be mutable or immutable to the remote client through the readonly keyword Remember, however, that if you make an attribute mutable instead of hiding it through a set of accessor functions, you lose control over how modifications are made The following is an example of an attribute, in contrast to our first interface example, which defined accessor functions:
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interface UserAccount { // balance is not protected, and can be easily changed attribute float balance; // account id may be read but not remotely modified readonly attribute long long accountid; };
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1236 IDL Operations
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While attributes have their uses, the most important part of an IDL schema will be the operations that are defined These operations may be invoked remotely, and can perform both simple and complex tasks, limited only by the imagination Operations are functions that can return a value upon completion and can accept parameters There are three types of parameters that may be specified for an IDL operation: 1 in parameter used for input only, and is immutable 2 out parameter whose contents may be modified, and is not immutable 3 inout parameter that combines the properties of in and out Such parameters may be used as input and may also be modified A cleaner implementation will result when you use input parameters only, and a single return value However, sometimes it may be necessary to use the other modifiers; readers are advised to use discretion The following interface shows three simple operations, two of which accept an input parameter Each operation also specified a return value (in this case, of type float)
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interface UserBalance { float getBalance(); float addBalance(in float amount); float subtractBalance(in float amount); };
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Note that if a method does not have a return value, just as in Java you should specify this by using the void keyword
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