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B This interface uses all three techniques to aggregate information, but we are most
interested in the parameter list. In this list, we have a boardName and discus-
sionID . We also have a collection of attributes that we bind together with a post
object that is nothing more than a collection of fields. In the original interface, we
needed to make several method calls, whereas this interface uses just one. We can
use this technique to collect several sets into a composite interface with a single
method call. The command interface uses this approach by having many local set
calls, a distributed execute call, followed again by local get s.
C This interface illustrates the use of a collection to aggregate many round-trips into
one. We'd normally have to make a round-trip for every object in the vector.
Instead, with this interface, we retrieve a single buffer that has many objects. We
also collect many different get calls into a single interface, because we'd normally
have to use the remote accessors for each of the attributes. Instead, we call once.
D This interface demonstrates the collection of several round-trips with a single com-
posite object. In this example, we have three composite objects.
This is the object for the board:
package com.bitterjava.bbs;
public class Board implements {
private java.lang.String name;
private java.util.Collection discussions;
public java.lang.String getName() {
return name;
public java.util.Collection getDiscussions() {
return discussions;
public void setName(String name) { = name;
public void setDiscussions(java.util.Vector discussions) {
this.discussions = discussions;
We aren't interested in encapsulating any behaviors here, since our behaviors
are captured in our model. We simply need a helper class so that we can orga-
nize all of the different parameters in our interface.
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