US6178440B1 — Distributed transaction processing system impleme…

Claim 1

Independent Claim 147 words

A computer system comprising: a request broker for receiving work requests and dispatching them for execution within said computer system; processor means for processing said requests which have been received by said request broker to perform the requested work; and concurrency control means for performing concurrency control with respect to concurrent requests, said concurrency control means being located within said request broker and comprising an analysis component for analyzing the requested object and method included in the work request and a locking component for locking the brokering of the method, and wherein the locking component comprises: a stack component for creating a stack of object instances as the work request is transferred from one object to another; a determining component for determining the object at the top level of containment; and lock means for applying an intent lock on the object at the top level of containment.

Claim 2

Dependent Claim 147 words

A computer system comprising: a request broker for receiving work requests and dispatching them for execution within said computer system; processor means for processing said requests which have been received by said request broker to perform the requested work; and concurrency control means for performing concurrency control with respect to concurrent requests, said concurrency control means being located within said request broker and comprising an analysis component for analyzing the requested object and method included in the work request and a locking component for locking the brokering of the method, and wherein the locking component comprises: a stack component for creating a stack of object instances as the work request is transferred from one object to another; a determining component for determining the object at the top level of containment; and lock means for applying an intent lock on the object at the top level of containment.

Claim 3

Dependent Claim 16 words

The computer system of claim 1 wherein the request broker comprises an object-oriented programming language interpreter.

Claim 4

Dependent Claim 27 words

The computer system of claim 1 wherein, said means for performing concurrency control isolates the effects of a group of related work requests which form a transaction.

Claim 5

Dependent Claim 31 words

The system of claim 1 wherein said computer system is a server, said work requests are received at said server from at least one client computer system on a heterogeneous platform.

Claim 6

Dependent Claim 133 words

In a computer system, a process for performing concurrency control on work requests comprising the step of: (a) receiving a work request at a request broker for said system; (b) said request broker performing a concurrency control analysis on a requested object and method included in said work request; and (c) said request broker locking the brokering of said method, wherein the locking comprises the steps of: (c1) creating a stack of object instances as said work request is transferred from said requested object to at least one other object that said requested object calls; (c2) checking said stack to determine the object at the top level of containment and the object at the bottom level of containment; and (c3) applying an intent lock on said object at the top level of containment.

Claim 7

Dependent Claim 133 words

In a computer system, a process for performing concurrency control on work requests comprising the step of: (a) receiving a work request at a request broker for said system; (b) said request broker performing a concurrency control analysis on a requested object and method included in said work request; and (c) said request broker locking the brokering of said method, wherein the locking comprises the steps of: (c1) creating a stack of object instances as said work request is transferred from said requested object to at least one other object that said requested object calls; (c2) checking said stack to determine the object at the top level of containment and the object at the bottom level of containment; and (c3) applying an intent lock on said object at the top level of containment.

Claim 8

Dependent Claim 58 words

The process of claim 5 wherein said analyzing step (b) includes sub-steps of: (b1) checking whether said first work request is requesting access to said object's fundamental state data of a basic type that maps directly to the storage media of the computer system; and (b2) checking whether said first work request is part of a current transaction.

Claim 9

Dependent Claim 70 words

The process of claim 6 wherein said analyzing step (b) further includes sub-steps of: (b3) checking whether the object associated with said work request is already locked by a previous request belonging to the same transaction as said work request; and (b4) checking whether the object associated with said work request is already locked by a conflicting lock belonging to a transaction different from the transaction of said work request.

Claim 10

Dependent Claim 57 words

The process of claim 5 wherein said locking step (c) further includes sub-steps of: (c4) applying intent locks on any remaining objects in the stack from the top-level of containment down to, but not including, the bottom level of containment; and (c5) applying a read or write lock on said object at the bottom level of containment.

Claim 11

Dependent Claim 27 words

The process of claim 5 wherein at said sub-step (c2) an attribute tag of a container object class definition is examined to determine the level of containment.

Claim 12

Dependent Claim 31 words

The process of claim 5 wherein said computer system is a server, said work requests are received at said server from at least one client computer system on a heterogeneous platform.

Claim 13

Dependent Claim 20 words

The process of claim 5 wherein said steps (a), (b) and (c) are performed by an object-oriented programming language interpreter.

Claim 14

Dependent Claim 24 words

A computer program product stored on a computer-readable storage medium, said product having code means for performing the functions recited in claim 5 .

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2004-01-23	2004-07-24	2005-01-23	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2008-01-23	2008-07-24	2009-01-23	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2012-01-23	2012-07-24	2013-01-23	$7700.00	Window Closed / Lapsed

Distributed transaction processing system implementing concurrency control within the object request broker and locking all server objects involved in a transaction at its start

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