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A mechanism for controlling access to workspaces includes a repository for storing the workspaces, an interface having a set of methods that can be invoked to access the repository, and a server having at least one server object which implements the interface.

A portion of the disclosure of this patent document contains material which is subject to copyright protection. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office file or records, but otherwise reserves all copyright rights whatsoever.

Field of the Invention []. More specifically, the invention relates to methods and systems for managing teamware workspaces. One of the major challenges in developing large-scale multi-platform software is coordinating the activities of a team of cvsrtack, i. To improve productivity, time-to-market, and quality of the software, the various phases of the development life cycle typically evolve concurrently, i.

Concurrent software development cvvstrack that the developers have access to common software base for the purpose of developing and building the software. The main challenge with this type of development process is how to control access to the software base fkletype track the changes made to the software base so that the integrity of the software base is maintained.

It should be noted that at any point in time, various configurations of the software base might exist because the various phases of the development cycle are evolving concurrently. If project directories and files are not available, an empty parent workspace is created.

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After creating the parent workspace, the developers create their own child workspaces with copies of the parent workspace files. The developers can then modify individual versions of the same file in their child workspaces without interfering with the work of other developers.

After the files are modified in the child workspaces, they are merged and copied to the parent workspace. Merging of files generally involves resolving conflicts between individual versions of the same file. Transactions between a child workspace and a parent workspace generally revolve around three relationships: This leaves the workspaces vulnerable to unauthorized and haphazard access and manipulation. In addition, it is hard to account for and trace all actions performed on the workspaces.

Further, because the workspace structure and metadata structure are published at the file system levelit is hard to change the format of the workspace to take advantage of more sophisticated structures and concepts.

It is hard because third party vendors and application programmers rely on that public information to develop and maintain their own applications.

Therefore, a system for managing workspaces that provides centralized control over how the workspaces are accessed and allows the workspace structure to evolve independently is desired. In one aspect, the invention relates to a mechanism for controlling access to workspaces which comprises a repository for storing the workspaces, an interface having a set of methods that can be invoked to access the repository, and a server having at least one server object which implements the interface.

In another aspect, the invention relates to a system for accessing workspaces which comprises a repository for storing the workspaces, an interface having a set of methods that can be invoked to access the repository, a server having at least one server object which implements the interface, and at least one servlet which parses requests sent to the server and delegates cvatrack of the request filetyle the server object. In another aspect, the invention relates to a system for remotely accessing workspaces in a network which comprises a repository for storing the workspaces, an interface having a set of methods that can be invoked to access the repository, a server having at least one server object which implements the interface, and a proxy object that can be called to forward a request for a method of the server object to the server.

In another aspect, the invention relates to a system for remotely accessing workspaces in a network which comprises a repository for storing the workspaces, an interface having a set of methods that can be invoked to access the repository, a server having at least one server object which implements the interface, a proxy object that can be called to forward a request for a method of the server object to the server, and a client that calls a method of the proxy object.

In another aspect, the invention relates to a system for remotely accessing workspaces in a client-server network which comprises a repository for storing the workspaces, an interface having a set of methods that can be invoked to access the repository, a server having at least one server object which implements the interface, a proxy object that can be called to forward a request for a method of the server object to the server, and a servlet which parses the cvsrrack and delegates processing of the request to the server object.

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In another aspect, the invention relates to a method for executing transactions in a network having a client-side and a server-side which comprises calling a method of a client-side proxy object that implements an interface having a set of methods that can be invoked to access a repository of workspaces and transmitting the method call to a server-side object which processes the method call and returns the result to the client-side proxy object.

In another aspect, the invention relates to a system for remotely accessing workspaces in a network which comprises a repository for storing the workspaces, an interface having cvtrack set of methods that can be invoked to access the repository, a server having at least one server object which implements the interface, and a mechanism for remotely invoking a method of the server object. In another aspect, the invention relates to a system for remotely accessing workspaces in a network which comprises a repository for storing the workspaces, an interface having a set of methods that can be invoked to access the repository, a first server that provides management functions for the repository, and a second server having at least one server object that implements the interface and that interacts with the first server to access the repository.

Other features and advantages of the invention will be apparent from the following description and the appended claims. In the following detailed fjletype of fuletype invention, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to one of ordinary cvsttrack in the art that the invention may be practiced without these specific details.

In other instances, well-known features have not been described in detail to avoid obscuring the invention. Referring now to the accompanying drawings, FIG. The teamware system 5 includes one or more repositories 10 only one is shown.

For illustration purposes, the repository 10 is shown as containing one repository workspace The workspace files are typically stored under a version control system, such as SCCS or RCS, so that changes made to the workspace files can be tracked. The teamware system [] 5 further includes a teamware server 20 that manages and provides access to the repository cvsrtack and its contents, e.

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A teamware client 25 sends messages to the teamware server 20 to access the repository 10 and its contents. As an example, the teamware client 25 may request for files in a specific repository workspace. If the request is successfully processed, the teamware server 20 returns the requested files to the teamware client In order for the teamware client 25 to talk to the teamware server 20a contract must exist between the teamware client 25 and the repository server This contract is called an application programmer interface API.

The API specifies interface classes and their methods, along with their input, output, and return data structures. As long as the API remains the same, the implementations of the teamware client 25 and teamware server 20 can evolve independently. What this means is that the teamware server 20 can be modified to accommodate changes in the internal structure of the repository 10 and its contents without requiring modifications to be made to the teamware client In order to better understand the invention, it is useful to consider some examples of interfaces classes and methods that may be included in the interface classes.

However, it should be clear that the following examples of interface classes are presented for illustration purposes and should not be construed as limiting the invention in any way.

In particular, those skilled in the art will appreciate that the interface classes and methods specified by the API would depend on the functionality desired from the teamware server [] 20 with respect to management of and access to repositories e. As the name suggests, the TwRepository interface class includes methods for interacting with a teamware repository, such as repository [] It should be noted that the interface definition shown in Table 1 is presented for illustration purposes and is not intended to limit the scope of the invention as otherwise described herein.

Throws exception if the request was not successful. The TwRepositoryWorkspace interface class includes methods for interacting with a repository workspace, such as repository workspace [] The TwWorkspace interface class includes methods for performing various general operations on a workspace, such as checking if a workspace is equal to a given object, checking whether a given workspace physically exists, checking whether a user has access for a specified operation, adding children to a workspace, removing children from a workspace, getting the children of a workspace, getting the parent of a workspace, and so forth.

Again, it should be noted that the interface definition shown in Table 2 is presented for illustration purposes and is not intended to limit the scope of the invention as otherwise described herein.

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As an example, another interface class that the API may include is called TwTransaction interface class. The TwTransaction interface class includes methods related to cvstfack transactions with the repository.

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Throws exception if request was not successful. The TwServer interface class includes methods for accessing the teamware server. Again, it should be noted that the interface definition shown in Table 4 is presented for illustration purposes and is not intended to limit the scope of the invention as otherwise described herein. URLConnection; import java net. Throws exception if the user was not successfully logged in. Cleans up the teamware TwServer connection and related context. Throws exception if the user was filetypd successfully logged out.

Throws TwServerException if the request was not successful. The TwAdminServer interface class includes administration-related methods. For example, the AdminServer interface class may include the methods shown in Table 5 below. It cleans up the TwAdminServer connection and related context.

Concurrent Versions System

As previously mentioned, the examples above are presented for illustration purposes and should not be construed as limiting the invention in any way. The main idea is that by providing a server-based API, all teamware clients, whether local or remote, will be guaranteed access to the repository and its contents in exactly the same way.

Further, by providing the server-based API as the means for accessing the repository and its contents, it becomes unnecessary to publish the internal structure of the repository. This allows the internal structure of the repository, including the structure of the repository workspaces, to evolve independently. The internal implementation of the teamware server [] 20which will not be published, can be modified as necessary to accommodate new repository structure.

As long as the API remains the same, it will not be necessary to modify the teamware clients. In this embodiment, the teamware system 5 includes a repository server 23 that performs repository filteype functions, including regulation of cvsgrack to repositories, such as repository 10and their contents. Cvsttrack teamware client 25 filetypw the repository 10 and its contents, such as repository workspace 15by sending messages to and receiving responses from the teamware server The teamware server 20 in turn interacts with connects to the repository server 23 to access the repository 10 and repository workspace As in the filftype illustrated in FIG.

Scalability is one cvstrsck the reasons for introducing the repository server The teamware server 20 can handle teamware management functions and delegate repository management functions to the repository server In this way, if the internal structure of the repository changes, only the implementation of the repository server 23 may need to be modified.

As long cvstrck the API remains the same, the implementation of the teamware client 25 would also not have to be modified. At runtime, as shown in FIG. A client object 35 invokes a server method by sending a message to the server object The server object 30 executes the corresponding operation and returns the result to the client object The internal implementation of the server object 30 is not visible to the client object Thus, the server methods that can be invoked by the client object 35 are the ones specified in the API.

At runtime, filetypd client object 35 and server object 30 belong to different address spaces in the same computer or may even reside on different computers connected by a network.

Because of this, a client object 35 cannot directly create server objects. Instead, new server objects are created by other objects already in the teamware server 20and the initial server object or set of server objects is created when the teamware server 20 starts cvstracm.

When the teamware client [] 25 and teamware server 20 run in different virtual machines, the server object 30 is remote to the client object The stub has the same interface, or list of methods, as the remote object filtype When the client object 35 calls the stub method, the stub forwards the request via the remote reference cvsyrack and transport layer to the remote object If the virtual machines are on separate computers that are not connected by a network file sharing system, another mechanism is needed to allow object-to-object communication between the virtual machines.

This mechanism could be similar to the one described in U. Servlets are small platform-independent programs that extend the functionality of a server.

In this embodiment, the teamware server 20 and servlets 45 are deployed on a web server 50 having built-in in-process or connector-based out-of-process web container The web container 55 is responsible for fiiletype, invoking, and managing the lifecycle of the servlet. The servlets cvsstrack parse requests from the teamware client 25 and delegate processing of the request to specific server objects in the teamware server

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