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Node or NodeI ?
Page 368 in Ice 3.1.0 document:
That is, the document emphasizes that if we want to invoke a member function of the XXXI class, we must use a XXXI reference instead of XXX interface reference. Can you explain a little more why ?
Further, in %ICEJ_HOME%\demo\book\simple_filesystem\Server.java:
Are they inconsistent ?
Thank you !
12.8.1Instantiating a Servant
Instantiating a servant means to allocate an instance:
Node servant = new NodeI("Fred");
This code creates a new NodeI instance and assigns its address to a reference of
type Node. This works because NodeI is derived from Node, so a Node reference
can refer to an instance of type NodeI. [color="Red"]However, if we want to invoke a
member function of the NodeI class at this point, we must use a NodeI reference[/color]:
NodeI servant = new NodeI("Fred");
Whether you use a Node or a NodeI reference [color="red"]depends purely on whether you
want to invoke a member function of the NodeI class[/color]: if not, a Node reference
works just as well as a NodeI reference.
That is, the document emphasizes that if we want to invoke a member function of the XXXI class, we must use a XXXI reference instead of XXX interface reference. Can you explain a little more why ?
Further, in %ICEJ_HOME%\demo\book\simple_filesystem\Server.java:
[b]File file[/b] = new FileI("README", root);
String[] text;
text = new String[] { "This file system contains a collection of poetry." };
try {
[b]file.write(text, null);[/b]
} catch (GenericError e) {
System.err.println(e.reason);
}
Are they inconsistent ?
Thank you !
0
Comments
-
What is meant here are member functions of NodeI that are not defined in the Slice definition of Node.0
