Patents by Inventor James H. Waldo

James H. Waldo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6760736
    Abstract: A system for using a lease to detect a failure and to perform failure recovery is provided in using this system, a client requests a lease from a server to utilize a resource managed by the server for a period of time. Responsive to the request, the server grants the lease, and the client continually requests renewal of the lease. If the client fails to renew the lease, the server detects that an error has occurred to the client. Similarly, if the server fails to respond to a renew request, the client detects that an error has occurred to the server. As part of the lease establishment, the client and server exchange failure-recovery routines that each invokes if the other experiences a failure.
    Type: Grant
    Filed: December 20, 2000
    Date of Patent: July 6, 2004
    Assignee: Sun Microsystems, Inc.
    Inventors: James H. Waldo, Ann M. Wollrath, Robert Scheifler, Kenneth C. R. C. Arnold
  • Patent number: 6728737
    Abstract: A method and system for leasing storage locations in a distributed processing system is provided. Consistent with this method and system, a client requests access to storage locations for a period of time (lease period) from a server, such as the file system manager. Responsive to this request, the server invokes a lease period algorithm, which considers various factors to determine a lease period during which time the client may access the storage locations. After a lease is granted, the server sends an object to the client that advises the client of the lease period and that provides the client with behavior to modify the lease, like canceling the lease or renewing the lease. The server supports concurrent leases, exact leases, and leases for various types of access. After all leases to a storage location expire, the server reclaims the storage location.
    Type: Grant
    Filed: February 15, 2002
    Date of Patent: April 27, 2004
    Assignee: Sun Microsystems, Inc.
    Inventors: Ann M. Wollrath, James H. Waldo, Kenneth C. R. C. Arnold
  • Patent number: 6708171
    Abstract: A network proxy is provided that facilitates the integration of orphan services into a network by enabling them to interact with a lookup service that contains an indication of the services that are available on the network. These orphan services typically reside on devices having too little memory to run the components necessary to be integrated into the network. Thus, the network proxy acts as a go between, by registering the orphan services with the lookup service so that clients may access them and by accessing services on behalf of the orphan services. As a result, the network proxy integrates orphan services into the network, when they otherwise would be incapable of doing so.
    Type: Grant
    Filed: June 14, 1999
    Date of Patent: March 16, 2004
    Assignee: Sun Microsystems, Inc.
    Inventors: James H. Waldo, John W. F. McClain
  • Patent number: 6704756
    Abstract: In accordance with the present invention a process is provided for allocating and deallocating resources in a distributed processing system having a requester platform and a server platform. The process involves receiving a request from the requester platform referring to a system resource and specifying a requested lease period, permitting shared access to the system resource for a lease period, sending a return call to the requester platform advising of the lease period, and deallocating the system resource when the lease period expires.
    Type: Grant
    Filed: May 14, 2001
    Date of Patent: March 9, 2004
    Assignee: Sun Microsystems, Inc.
    Inventors: Ann M. Wollrath, James H. Waldo, Roger Riggs
  • Patent number: 6654793
    Abstract: A stub retrieval and loading subsystem is disclosed for use in connection with a remote method invocation system. The stub retrieval and loading subsystem controls the retrieval and loading of a stub for a remote method, into an execution environment, to facilitate invocation of the remote method by a program executing in the execution environment. The stub retrieval subsystem includes a stub retriever for initiating a retrieval of the stub and stub loader for, when the stub is received by the stub retriever, loading the stub into the execution environment, thereby to make the stub available for use in remote invocation of the remote method. In one embodiment, the stub retrieval and loading subsystem effects the retrieval and loading for a program operating in one address space provided by one computer, of stub class instances to effect the remote invocation of methods which are provided by objects operating in another address space, which may be provided by the same computer or a different computer.
    Type: Grant
    Filed: June 30, 1998
    Date of Patent: November 25, 2003
    Assignee: Sun Microsystems, Inc.
    Inventors: Ann M. Wollrath, James H. Waldo, Roger Riggs
  • Publication number: 20030208512
    Abstract: In accordance with the present invention a process is provided for allocating and deallocating resources in a distributed processing system having a requester platform and a server platform. The process involves receiving a request from the requestor platform referring to a system resource and specifying a requested lease period, permitting shared access to the system resource for a lease period, sending a return call to the requestor platform advising of the lease period, and deallocating the system resource when the lease period expires.
    Type: Application
    Filed: June 19, 2003
    Publication date: November 6, 2003
    Applicant: Sun Microsystems, Inc.
    Inventors: Ann M. Wollrath, James H. Waldo, Roger Riggs
  • Publication number: 20030191842
    Abstract: An improved lookup service is provided that allows for the dynamic addition and deletion of services. This lookup service allows for the addition and deletion of services automatically, without user intervention. As a result, clients of the lookup service may continue using the lookup service and its associated services while the updates occur. Additionally, the lookup service provides a notification mechanism that can be used by clients to receive a notification when the lookup service is updated. By receiving such a notification, clients can avoid attempting to access a service that is no longer available and can make use of new services as soon as they are added to the lookup service.
    Type: Application
    Filed: April 8, 2003
    Publication date: October 9, 2003
    Applicant: Sun Microsystems Inc.
    Inventors: Brian T. Murphy, Robert W. Scheifler, Zane Pan, James H. Waldo, Ann M. Wollrath, Kenneth C.R.C. Arnold
  • Patent number: 6604127
    Abstract: An improved lookup service is provided that allows for the dynamic addition and deletion of services. This lookup service allows for the addition and deletion of services automatically, without user intervention. As a result, clients of the lookup service may continue using the lookup service and its associated services while the updates occur. Additionally, the lookup service provides a notification mechanism that can be used by clients to receive a notification when the lookup service is updated. By receiving such a notification, clients can avoid attempting to access a service that is no longer available and can make use of new services as soon as they are added to the lookup service.
    Type: Grant
    Filed: July 27, 2001
    Date of Patent: August 5, 2003
    Inventors: Brian T. Murphy, Robert W. Scheifler, Zane Pan, James H. Waldo, Ann M. Wollrath, Kenneth C. R. C. Arnold
  • Publication number: 20030115374
    Abstract: A system for leasing a group membership in a distributed processing system is provided. In accordance with this system, a remote object requests from an activation group a membership in the activation group for a period of time. Responsive to this request, the activation group determines an appropriate lease period during which time the remote object becomes a member of the activation group and runs in the same address space as other objects of the activation group.
    Type: Application
    Filed: January 31, 2003
    Publication date: June 19, 2003
    Applicant: Sun Microsystems, Inc.
    Inventors: James H. Waldo, Ann M. Wollrath, Robert Scheifler, Kenneth C.R.C Arnold
  • Patent number: 6578044
    Abstract: A database system wherein one or more entry databases store a plurality of entries. Each entry is of a given type that defines the fields of the entry. Each field contains or identifies an object with associated attributes or data. The type of each entry may further define behavior in the form of methods the entry can implement. An entry type which is a subtype of another inherits all fields and behavior of its super-type, and contains additional fields and/or defines new/modified behavior. Entries may be expressed in a Java™ programming language. The database system may further employ a search engine which allows queries to be made upon entries in the database. In one implementation, the queries include a read operation, a take operation, and a notify operation. Each query request includes a command indicating the type of operation, and a template which is an entry object having some or all of its fields set to specific values that must be matched exactly.
    Type: Grant
    Filed: March 20, 1998
    Date of Patent: June 10, 2003
    Assignee: Sun Microsystems, Inc.
    Inventors: Robert W. Scheifler, Kenneth C.R.C. Arnold, James H. Waldo
  • Patent number: 6567820
    Abstract: A database system wherein one or more entry databases store a plurality of entries. Each entry is of a given type that defines the fields of the entry. Each field contains or identifies an object with associated attributes or data. The type of each entry may further define behavior in the form of methods the entry can implement. An entry type which is a subtype of another inherits all fields and behavior of its super-type, and contains additional fields and/or defines new/modified behavior. Entries may be expressed in a Java™ programming language. The database system may further employ a search engine which allows queries to be made upon entries in the database. In one implementation, the queries include a read operation, a take operation, and a notify operation. Each query request includes a command indicating the type of operation, and a template which is an entry object having some or all of its fields set to specific values that must be matched exactly.
    Type: Grant
    Filed: November 21, 2000
    Date of Patent: May 20, 2003
    Assignee: Sun Microsystems, Inc.
    Inventors: Robert W. Scheifler, Kenneth C. R. C. Arnold, James H. Waldo
  • Publication number: 20030093505
    Abstract: In accordance with methods and systems consistent with the present invention, a lease manager is provided for managing leases between clients and other network services. To use the lease manager, a client enters into a management lease with the lease manager, specifying an amount of time during which the lease manager can manage preexisting leases between the client and network services on behalf of the client. This management includes renewing the preexisting leases with the other network services. Further, the lease manager notifies the client when a lease between the lease manager and the client is near expiration. The lease manager also notifies the client of failed attempts to renew the preexisting leases, as well as the management lease, either with a network service or with the lease manager.
    Type: Application
    Filed: November 6, 2002
    Publication date: May 15, 2003
    Applicant: Sun Microsystems, Inc.
    Inventors: James H. Waldo, John W.F. McClain
  • Patent number: 6564240
    Abstract: A system for leasing a group membership in a distributed processing system is provided. In accordance with this system, a remote object requests from an activation group a membership in the activation group for a period of time. Responsive to this request, the activation group determines an appropriate lease period during which time the remote object becomes a member of the activation group and runs in the same address space as other objects of the activation group.
    Type: Grant
    Filed: February 20, 2002
    Date of Patent: May 13, 2003
    Assignee: Sun Microsystems, Inc.
    Inventors: James H. Waldo, Ann M. Wollrath, Robert Scheifler, Kenneth C. R. C. Arnold
  • Patent number: 6560656
    Abstract: Downloading code for communicating with a device that joins a network. When the device joins the network, it transmits a multicast packet including a reference to code for use in communicating with the device. Receivers in the network use the reference to download the code for constructing objects to communicate with the device, and the receivers respond with a reference to a lookup service in the network. Using the reference from the receivers, the device registers with the lookup service.
    Type: Grant
    Filed: March 20, 1998
    Date of Patent: May 6, 2003
    Assignee: Sun Microsystems, Inc.
    Inventors: Bryan O'Sullivan, Robert Scheifler, Peter C. Jones, Ann M. Wollrath, Kenneth C. R. C. Arnold, James H. Waldo
  • Publication number: 20030084204
    Abstract: A stub retrieval and loading subsystem is disclosed for use in connection with a remote method invocation system. The stub retrieval and loading subsystem controls the retrieval and loading of a stub for a remote method, into an execution environment, to facilitate invocation of the remote method by a program executing in the execution environment. The stub retrieval subsystem includes a stub retriever for initiating a retrieval of the stub and stub loader for, when the stub is received by the stub retriever, loading the stub into the execution environment, thereby to make the stub available for use in remote invocation of the remote method. In one embodiment, the stub retrieval and loading subsystem effects the retrieval and loading for a program operating in one address space provided by one computer, of stub class instances to effect the remote invocation of methods which are provided by objects operating in another address space, which may be provided by the same computer or a different computer.
    Type: Application
    Filed: April 23, 1996
    Publication date: May 1, 2003
    Inventors: ANN M. WOLLRATH, JAMES H. WALDO, ROGER RIGGS
  • Patent number: 6519615
    Abstract: A method and system for leasing storage locations in a distributed processing system is provided. Consistent with this method and system, a client requests access to storage locations for a period of time (lease period) from a server, such as the file system manager. Responsive to this request, the server invokes a lease period algorithm, which considers various factors to determine a lease period during which time the client may access the storage locations. After a lease is granted, the server sends an object to the client that advises the client of the lease period and that provides the client with behavior to modify the lease, like canceling the lease or renewing the lease. The server supports concurrent leases, exact leases, and leases for various types of access. After all leases to a storage location expire, the server reclaims the storage location.
    Type: Grant
    Filed: October 18, 2000
    Date of Patent: February 11, 2003
    Assignee: Sun Microsystems, Inc.
    Inventors: Ann M. Wollrath, James H. Waldo, Kenneth C. R. C. Arnold
  • Publication number: 20030023613
    Abstract: Use of a policy object for verification in a distributed system. A machine downloads a policy object containing a reference to code governing verification of data. The machine uses the reference to obtain the code and locally verify data or other information. As particular rules for the data change, the policy object may be updated to provide a reference to the code for the new rules when it is downloaded.
    Type: Application
    Filed: May 10, 2002
    Publication date: January 30, 2003
    Applicant: Sun Microsystems, Inc.
    Inventors: Kenneth C.R.C. Arnold, Ann M. Wollrath, James H. Waldo
  • Publication number: 20020199036
    Abstract: Use of a smart proxy as a wrapper around a stub in a distributed system. Instead of receiving a stub as a result of a remote procedure call, a caller receives a smart proxy including the stub as an embedded object. The smart proxy performs predefined processing associated with a remote procedure call, the processing possibly occurring before, during, or after a response to the call.
    Type: Application
    Filed: May 6, 2002
    Publication date: December 26, 2002
    Applicant: Sun Microsystems, Inc.
    Inventors: Kenneth C.R.C. Arnold, James H. Waldo, Robert Scheifler, Ann M. Wollrath
  • Publication number: 20020198895
    Abstract: Use of a policy object for verification in a distributed system. A machine downloads a policy object containing a reference to code governing verification of data. The machine uses the reference to obtain the code and locally verify data or other information. As particular rules for the data change, the policy object may be updated to provide a reference to the code for the new rules when it is downloaded.
    Type: Application
    Filed: May 10, 2002
    Publication date: December 26, 2002
    Applicant: Sun Microsystems, Inc.
    Inventors: Kenneth C.R.C. Arnold, Ann M. Wollrath, James H. Waldo
  • Patent number: 6499049
    Abstract: In accordance with methods and systems consistent with the present invention, a lease manager is provided for managing leases between clients and other network services. To use the lease manager, a client enters into a management lease with the lease manager, specifying an amount of time during which the lease manager can manage preexisting leases between the client and network services on behalf of the client. This management includes renewing the preexisting leases with the other network services. Further, the lease manager notifies the client when a lease between the lease manager and the client is near expiration. The lease manager also notifies the client of failed attempts to renew the preexisting leases, as well as the management lease, either with a network service or with the lease manager.
    Type: Grant
    Filed: September 19, 2001
    Date of Patent: December 24, 2002
    Assignee: Sun Microsystems, Inc.
    Inventors: James H. Waldo, John W. F. McClain