java.rmi.activation
public final class: ActivationGroupDesc [javadoc |
source]
java.lang.Object
java.rmi.activation.ActivationGroupDesc
All Implemented Interfaces:
Serializable
An activation group descriptor contains the information necessary to
create/recreate an activation group in which to activate objects.
Such a descriptor contains:
- the group's class name,
- the group's code location (the location of the group's class), and
- a "marshalled" object that can contain group specific
initialization data.
The group's class must be a concrete subclass of
ActivationGroup
. A subclass of
ActivationGroup
is created/recreated via the
ActivationGroup.createGroup
static method that invokes
a special constructor that takes two arguments:
- the group's
ActivationGroupID
, and
- the group's initialization data (in a
java.rmi.MarshalledObject
)
Nested Class Summary: |
---|
public static class | ActivationGroupDesc.CommandEnvironment | Startup options for ActivationGroup implementations.
This class allows overriding default system properties and
specifying implementation-defined options for ActivationGroups. |
Constructor: |
public ActivationGroupDesc(Properties overrides,
CommandEnvironment cmd) {
this(null, null, null, overrides, cmd);
}
Constructs a group descriptor that uses the system defaults for group
implementation and code location. Properties specify Java
environment overrides (which will override system properties in
the group implementation's VM). The command
environment can control the exact command/options used in
starting the child VM, or can be null to accept
rmid's default.
This constructor will create an ActivationGroupDesc
with a null group class name, which indicates the system's
default ActivationGroup implementation. Parameters:
overrides - the set of properties to set when the group is
recreated.
cmd - the controlling options for executing the VM in
another process (or null ).
- since:
1.2 -
|
public ActivationGroupDesc(String className,
String location,
MarshalledObject<?> data,
Properties overrides,
CommandEnvironment cmd) {
this.props = overrides;
this.env = cmd;
this.data = data;
this.location = location;
this.className = className;
}
Specifies an alternate group implementation and execution
environment to be used for the group. Parameters:
className - the group's package qualified class name or
null . A null group class name indicates
the system's default ActivationGroup implementation.
location - the location from where to load the group's
class
data - the group's initialization data contained in
marshalled form (could contain properties, for example)
overrides - a properties map which will override those set
by default in the subprocess environment (will be translated
into -D options), or null .
cmd - the controlling options for executing the VM in
another process (or null ).
- since:
1.2 -
|
Methods from java.lang.Object: |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Method from java.rmi.activation.ActivationGroupDesc Detail: |
public boolean equals(Object obj) {
if (obj instanceof ActivationGroupDesc) {
ActivationGroupDesc desc = (ActivationGroupDesc) obj;
return
((className == null ? desc.className == null :
className.equals(desc.className)) &&
(location == null ? desc.location == null :
location.equals(desc.location)) &&
(data == null ? desc.data == null : data.equals(desc.data)) &&
(env == null ? desc.env == null : env.equals(desc.env)) &&
(props == null ? desc.props == null :
props.equals(desc.props)));
} else {
return false;
}
}
Compares two activation group descriptors for content equality. |
public String getClassName() {
return className;
}
Returns the group's class name (possibly null ). A
null group class name indicates the system's default
ActivationGroup implementation. |
public CommandEnvironment getCommandEnvironment() {
return this.env;
}
Returns the group's command-environment control object. |
public MarshalledObject<?> getData() {
return data;
}
Returns the group's initialization data. |
public String getLocation() {
return location;
}
Returns the group's code location. |
public Properties getPropertyOverrides() {
return (props != null) ? (Properties) props.clone() : null;
}
Returns the group's property-override list. |
public int hashCode() {
// hash location, className, data, and env
// but omit props (may be expensive)
return ((location == null
? 0
: location.hashCode() < < 24) ^
(env == null
? 0
: env.hashCode() < < 16) ^
(className == null
? 0
: className.hashCode() < < 8) ^
(data == null
? 0
: data.hashCode()));
}
Produce identical numbers for similar ActivationGroupDesc s. |