org.osgi.service.monitor

Class MonitorPermission

java.lang.Object

java.security.Permission

org.osgi.service.monitor.MonitorPermission

All Implemented Interfaces:

java.io.Serializable, java.security.Guard

public class MonitorPermission
extends java.security.Permission

Indicates the callers authority to publish, read or reset StatusVariables, to switch event sending on or off or to start monitoring jobs. The target of the permission is the identifier of the StatusVariable, the action can be read, publish, reset, startjob, switchevents, or the combination of these separated by commas. Action names are interpreted case-insensitively, but the canonical action string returned by getActions() uses the forms defined by the action constants.

If the wildcard * appears in the actions field, all legal monitoring commands are allowed on the designated target(s) by the owner of the permission.

Author:

$Id: 2899bf825eb4b7708601d99fb39019087deddefb $

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	PUBLISH Holders of MonitorPermission with the publish action present are Monitorable services that are allowed to publish the StatusVariables specified in the permission's target field.
static java.lang.String	READ Holders of MonitorPermission with the read action present are allowed to read the value of the StatusVariables specified in the permission's target field.
static java.lang.String	RESET Holders of MonitorPermission with the reset action present are allowed to reset the value of the StatusVariables specified in the permission's target field.
static java.lang.String	STARTJOB Holders of MonitorPermission with the startjob action present are allowed to initiate monitoring jobs involving the StatusVariables specified in the permission's target field.
static java.lang.String	SWITCHEVENTS Holders of MonitorPermission with the switchevents action present are allowed to switch event sending on or off for the value of the StatusVariables specified in the permission's target field.

Constructor Summary

Constructors

Constructor and Description
MonitorPermission(java.lang.String statusVariable, java.lang.String actions) Create a MonitorPermission object, specifying the target and actions.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(java.lang.Object o) Determines the equality of two MonitorPermission objects.
java.lang.String	getActions() Get the action string associated with this permission.
int	hashCode() Create an integer hash of the object.
boolean	implies(java.security.Permission p) Determines if the specified permission is implied by this permission.

Methods inherited from class java.security.Permission

checkGuard, getName, newPermissionCollection, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

READ

public static final java.lang.String READ

Holders of MonitorPermission with the read action present are allowed to read the value of the StatusVariables specified in the permission's target field.

See Also:

Constant Field Values

RESET

public static final java.lang.String RESET

Holders of MonitorPermission with the reset action present are allowed to reset the value of the StatusVariables specified in the permission's target field.

See Also:

Constant Field Values

PUBLISH

public static final java.lang.String PUBLISH

Holders of MonitorPermission with the publish action present are Monitorable services that are allowed to publish the StatusVariables specified in the permission's target field. Note, that this permission cannot be enforced when a Monitorable registers to the framework, because the Service Registry does not know about this permission. Instead, any StatusVariables published by a Monitorable without the corresponding publish permission are silently ignored by MonitorAdmin, and are therefore invisible to the users of the monitoring service.

See Also:

Constant Field Values

STARTJOB

public static final java.lang.String STARTJOB

Holders of MonitorPermission with the startjob action present are allowed to initiate monitoring jobs involving the StatusVariables specified in the permission's target field.

A minimal sampling interval can be optionally defined in the following form: startjob:n. This allows the holder of the permission to initiate time based jobs with a measurement interval of at least n seconds. If n is not specified or 0 then the holder of this permission is allowed to start monitoring jobs specifying any frequency.

See Also:

Constant Field Values

SWITCHEVENTS

public static final java.lang.String SWITCHEVENTS

Holders of MonitorPermission with the switchevents action present are allowed to switch event sending on or off for the value of the StatusVariables specified in the permission's target field.

See Also:

Constant Field Values

Constructor Detail

MonitorPermission

public MonitorPermission(java.lang.String statusVariable,
                 java.lang.String actions)
                  throws java.lang.IllegalArgumentException

Create a MonitorPermission object, specifying the target and actions.

The statusVariable parameter is the target of the permission, defining one or more status variable names to which the specified actions apply. Multiple status variable names can be selected by using the wildcard * in the target string. The wildcard is allowed in both fragments, but only at the end of the fragments.

For example, the following targets are valid: com.mycomp.myapp/queue_length, com.mycomp.myapp/*, com.mycomp.*/*, */*, */queue_length, */queue*.

The following targets are invalid: *.myapp/queue_length, com.*.myapp/*, *.

The actions parameter specifies the allowed action(s): read, publish, startjob, reset, switchevents, or the combination of these separated by commas. String constants are defined in this class for each valid action. Passing "*" as the action string is equivalent to listing all actions.

Parameters:

statusVariable - the identifier of the StatusVariable in [Monitorable_id]/[StatusVariable_id] format

actions - the list of allowed actions separated by commas, or * for all actions

Throws:

java.lang.IllegalArgumentException - if either parameter is null, or invalid with regard to the constraints defined above and in the documentation of the used actions

Method Detail

hashCode

public int hashCode()

Create an integer hash of the object. The hash codes of MonitorPermissions p1 and p2 are the same if p1.equals(p2).

Specified by:

hashCode in class java.security.Permission

Returns:

the hash of the object

equals

public boolean equals(java.lang.Object o)

Determines the equality of two MonitorPermission objects. Two MonitorPermission objects are equal if their target strings are equal and the same set of actions are listed in their action strings.

Specified by:

equals in class java.security.Permission

Parameters:

o - the object being compared for equality with this object

Returns:

true if the two permissions are equal

getActions

public java.lang.String getActions()

Get the action string associated with this permission. The actions are returned in the following order: read, reset, publish, startjob, switchevents.

Specified by:

getActions in class java.security.Permission

Returns:

the allowed actions separated by commas, cannot be null

implies

public boolean implies(java.security.Permission p)

Determines if the specified permission is implied by this permission.

This method returns false if and only if at least one of the following conditions are fulfilled for the specified permission:

• it is not a MonitorPermission
• it has a broader set of actions allowed than this one
• it allows initiating time based monitoring jobs with a lower minimal sampling interval
• the target set of Monitorables is not the same nor a subset of the target set of Monitorables of this permission
• the target set of StatusVariables is not the same nor a subset of the target set of StatusVariables of this permission

Specified by:

implies in class java.security.Permission

Parameters:

p - the permission to be checked

Returns:

true if the given permission is implied by this permission