com.sun.jini.fiddler

Class FiddlerProxy.ConstrainableFiddlerProxy

java.lang.Object

com.sun.jini.fiddler.FiddlerProxy

com.sun.jini.fiddler.FiddlerProxy.ConstrainableFiddlerProxy

All Implemented Interfaces:

Serializable, Administrable, RemoteMethodControl, LookupDiscoveryService, ReferentUuid

Enclosing class:

FiddlerProxy

static final class FiddlerProxy.ConstrainableFiddlerProxy
extends FiddlerProxy
implements RemoteMethodControl

The constrainable version of the class FiddlerProxy.

When a client obtains an instance of this proxy class, the client should not attempt to use the proxy until the client is assured that the proxy can be trusted. In addition to implementing the methods and mechanisms required by RemoteMethodControl, this class - in conjunction with the service's ProxyVerifier class, helps provide a mechanism for verifying trust in the proxy on behalf of a client.

In order to verify that an instance of this class is trusted, trust must be verified in all subsidiary objects (contained in that instance) through which the client ultimately makes calls (local or remote). With respect to this class, the server field is a proxy object through which the client makes remote calls to the service's backend. Therefore, trust in that object must be verified. Additionally, this class also contains a field of type Uuid (proxyID which should be tested for trust. Consider the following diagram:

    FiddlerProxy {
        Fiddler server
        Uuid proxyID
    }//end FiddlerProxy
  

Thus, in order to verify that an instance of this class is trusted, trust must be verified in the following objects from the diagram above:

• server
• proxyID

When a client obtains an instance of this proxy class, the deserialization process which delivers the proxy to the client invokes the readObject method of this class. Part of trust verification is performed in the readObject method, and part is performed when the client prepares the proxy. Thus, this class' participation in the trust verification process can be summarized as follows:

• server
  • readObject
    • verify server != null
    • verify server implements RemoteMethodControl
    • verify server's method constraints are the same as those placed on the corresponding public Remote methods of its outer proxy class
  • proxy preparation
    • Security.verifyObjectTrust() which calls
    • ProxyVerifier.isTrustedObject() which calls
    • canonicalServerObject.checkTrustEquivalence(server) (whose implementation is supplied by the particular RMI implementation that was used to export the server)
• proxyID
  • readObject
    • verify proxyID != null

Since:

2.0

Nested Class Summary

Nested classes/interfaces inherited from class com.sun.jini.fiddler.FiddlerProxy

FiddlerProxy.ConstrainableFiddlerProxy

Field Summary

Fields

Modifier and Type	Field and Description
private MethodConstraints	methodConstraints Client constraints placed on this proxy (may be null).
private static Method[]	methodMapArray
(package private) static long	serialVersionUID

Fields inherited from class com.sun.jini.fiddler.FiddlerProxy

proxyID, server

Constructor Summary

Constructors

Modifier	Constructor and Description
private	FiddlerProxy.ConstrainableFiddlerProxy(Fiddler server, Uuid proxyID, MethodConstraints methodConstraints) Constructs a new ConstrainableFiddlerProxy instance.

Method Summary

Methods

Modifier and Type	Method and Description
private static Fiddler	constrainServer(Fiddler server, MethodConstraints constraints) Returns a copy of the given server proxy having the client method constraints that result after the specified method mapping is applied to the given client method constraints.
MethodConstraints	getConstraints() Returns the client constraints placed on the current instance of this proxy class (ConstrainableFiddlerProxy).
private ProxyTrustIterator	getProxyTrustIterator() Returns a proxy trust iterator that is used in ProxyTrustVerifier to retrieve this object's trust verifier.
private void	readObject(ObjectInputStream s) Performs various functions related to the trust verification process for the current instance of this proxy class, as detailed in the description for this class.
RemoteMethodControl	setConstraints(MethodConstraints constraints) Returns a new copy of this proxy class (ConstrainableFiddlerProxy) with its client constraints set to the specified constraints.

Methods inherited from class com.sun.jini.fiddler.FiddlerProxy

createServiceProxy, equals, getAdmin, getReferentUuid, hashCode, register

Methods inherited from class java.lang.Object

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

Field Detail

serialVersionUID

static final long serialVersionUID

See Also:

Constant Field Values

methodMapArray

private static final Method[] methodMapArray

methodConstraints

private MethodConstraints methodConstraints

Client constraints placed on this proxy (may be null).

Constructor Detail

FiddlerProxy.ConstrainableFiddlerProxy

private FiddlerProxy.ConstrainableFiddlerProxy(Fiddler server,
                                      Uuid proxyID,
                                      MethodConstraints methodConstraints)

Constructs a new ConstrainableFiddlerProxy instance.

For a description of all but the methodConstraints argument (provided below), refer to the description for the constructor of this class' super class.

Parameters:

methodConstraints - the client method constraints to place on this proxy (may be null).

Method Detail

constrainServer

private static Fiddler constrainServer(Fiddler server,
                      MethodConstraints constraints)

Returns a copy of the given server proxy having the client method constraints that result after the specified method mapping is applied to the given client method constraints.

setConstraints

public RemoteMethodControl setConstraints(MethodConstraints constraints)

Returns a new copy of this proxy class (ConstrainableFiddlerProxy) with its client constraints set to the specified constraints. A null value is interpreted as mapping all methods to empty constraints.

Specified by:

setConstraints in interface RemoteMethodControl

Parameters:

constraints - client constraints, or null

Returns:

a new copy of this proxy with the client constraints set to the specified constraints

See Also:

RemoteMethodControl.getConstraints()

getConstraints

public MethodConstraints getConstraints()

Returns the client constraints placed on the current instance of this proxy class (ConstrainableFiddlerProxy). The value returned by this method can be null, which is interpreted as mapping all methods to empty constraints.

Specified by:

getConstraints in interface RemoteMethodControl

Returns:

the client constraints, or null

See Also:

RemoteMethodControl.setConstraints(net.jini.core.constraint.MethodConstraints)

getProxyTrustIterator

private ProxyTrustIterator getProxyTrustIterator()

Returns a proxy trust iterator that is used in ProxyTrustVerifier to retrieve this object's trust verifier.

readObject

private void readObject(ObjectInputStream s)
                 throws IOException,
                        ClassNotFoundException

Performs various functions related to the trust verification process for the current instance of this proxy class, as detailed in the description for this class.

Throws:

InvalidObjectException - if any of the requirements for trust verification (as detailed in the class description) are not satisfied.

IOException

ClassNotFoundException