2.1 Calls on objects

legion_exports_interface
     {[-c] <context name> | -l <LOID>}
     {-w <well-known class type> | -f <function signature>}+
     [-debug] [-help]

Creates an interface from the list of <well-known class type> and <function signature> arguments specified in the argument list. Sends this interface to the object specified by <LOID> or <context path> in the form of a call to the object mandatory function named exportsInterface(). Prints to standard output the return value from the call:

1 if the interface of the object contains the entire interface of functions specified by the user

0 if any one or more of the functions are not exported by the object

-1 (without contacting the specified object) if the user creates a malformed argument list

The <well-known class type> argument is a string in the set of well-known strings. The set can be listed via the legion_wellknown_class tool (see page 51).

For this tool's purposes, ClassObject is a well-known class string. CommandLineClass and BootstrapMetaClass are not considered well-known classes because they do not have any special member functions, as shown in the examples below.

$ legion_exports_interface /class/LegionClass \    
   -w ClassObject
1
$

$ legion_exports_interface /class/LegionClass \
    -w CommandLineObject
"CommandLineObject" is not a well known class. Exiting.
-1
$

$ legion_exports_interface /class/LegionClass \
   -w LegionClass -w ClassObject
1
$

$ legion_exports_interface /hosts/BootstrapHost \
   -w UnixHostClass
1
$

$ legion_exports_interface /hosts/BootstrapHost \
  -w ClassObject
0
$

$ legion_exports_interface /class/LegionClass \
   -f "     LegionLOID ping();"
1
$

$ legion_exports_interface /hosts/BootstrapHost \
   -f "     LegionLOID ping();" -w UnixHostClass
1
$

The following options are supported:

legion_get_interface 
     {[-c] <class context name> | -l <class LOID>} [-debug] [-help]

Retrieves the interface of a Legion object, named by <class LOID> or <context path>, by calling that object's getInterface() member function. Prints the returned interface to stdout.

The example below returns the interface of the LegionClass (the metaclass for all Legion classes).

$ legion_get_interface class/LegionClass
Getting the interface of object:1.01.01..000001fc0b325...
Object Interface:
	void deactivate();
	RestoreStateReply restoreState();
	SaveStateReply saveState(SaveStateRequest);
	LegionLOID ping();
	LegionObjectInterface getInterface();
	int exportsInterface(LegionObjectInterface);
	int addAttribute(ObjectAttribute);
	int addAttributes(ObjectAttributeList);
	int replaceAttribute(ObjectAttribute, ObjectAttribute);
	int replaceAttribute_s(ObjectAttribute, ObjectAttribute);
	int replaceAttributes(ObjectAttributeList,
		ObjectAttributeList);
	int replaceAttributes_s(ObjectAttributeSignatureList,
		ObjectAttributeList);
	int removeAttribute(ObjectAttribute);
	int removeAttribute_s(ObjectAttributeSignature);
	int removeAttributes(ObjectAttributeList);
	int removeAttributes_s(ObjectAttributeSignatureList);
	LegionAttributeList retrieveAttributes(
		ObjectAttribute-List);
	LegionAttributeSignatureList retrieveAttributes_s(
		ObjectAttributeSignatureList);
	LegionAttributeList retrieveAllAttributes();
$

The following options are supported:

legion_ping 
     {[-c] <object context name> | -l <object LOID>} 
     [-timeout <seconds>] [-debug] [-help]

Calls the object-mandatory ping() member function on the object named in <object LOID>. If the command returns, the object exists in an active state and its LOID is displayed.

$ legion_ping foo
Pinging:  1.01.66000000.14000000.000001fc0a72...
Returned: 1.01.66000000.14000000.000001fc0a72...
$

If the object is not accessible by the tool, the command will return an error.

$ legion_ping foo
"foo" does not resolve to a valid loid in my context.

The following optional parameters are available:

legion_list_attributes 
     {[-c] <object context name> | -l <object LOID>} 
     [-L] [<attribute name>] [-debug] [-help]

Lists an object's attributes from the command line. Optional parameters do the following:

A very simple example of this command is below. An object's attributes can include architecture, operating system information, host or vault compatibility, encryption information, etc.

$ legion_list_attributes Foo
Foo:
  (ALL)
Total attributes retrieved 1
        favoritecolors('puce', 'apricot')
$

legion_list_invocations 
     {[-c] <object context name> | -l <object LOID>} [-debug] [-help]

Prints a list of currently pending, started, and recently completed invocations for a given object. The output will include information about each invocation's status, timing, progress, and errors.

The following options are supported:

legion_object_info 
     {[-c] <object context name> | -l <object LOID>} 
     [-v] [-debug] [-help]

Prints information about a given object. The output (obtained from the object's class) will include the object's host, vault, owner, Object Address, status, etc. Optional parameters do the following:

legion_update_attributes 
     {[-c] <object context name> | -l <object LOID>}
     [{-a | -d | -t} <attribute description>] [-u] [-debug] [-help]

Adds, deletes, test, and updates attributes, named in <attribute description>, of an object named in <context path> or <object LOID> from the command line. The <attribute description> parameter takes the form name(val1 ... valn). The attribute description must not contain any spaces or begin with an uppercase letter.

Optional parameters do the following:

The following example adds the attribute favoritenames to object Foo, with the -A flag.

$ legion_update_attributes foo -a "favoritenames(bob, fred)"
IN make_attr_from_input - favoritenames(bob, fred)
** ADDED 1 attributes(s) to object
$

Similarly, you can remove attributes, with the -d flag. Note, however, that all parameters must be included in order to remove an attribute:

$ legion_update_attributes foo -d "favoritenames(bob)"
IN make_attr_from_input - favoritenames(bob)
** WARNING - DELETED 0 attributes(s) from object instead of 1 specified
$

$ legion_update_attributes foo -d "favoritenames(bob, fred)"
IN make_attr_from_input - favoritenames(bob, fred)
** DELETED 1 attributes(s) from object
$

legion@Virginia.edu
http://legion.virginia.edu/