Patent Publication Number: US-9904525-B2

Title: Managing reusable artifacts using placeholders

Description:
BACKGROUND 
     Arrangements described herein relate to management of reusable artifacts. 
     Creating applications or systems from reusable components is common as a means to accelerate the delivery of solutions and reduce cost. Tracking the evolution of systems over time requires versioning, both for individual units of data and for configurations. The use of versioning provides the ability to view the history of individual units of data and compare any two versions of data to identify the changes between them, and the ability to view the history of a configuration to see how the data has changed over time. Today, the primary means of managing and tracking evolution of a system is via a configuration management system. A configuration management system requires a user to manually manage workspaces, and manually check out and check in data, assign new versions to the data, etc. 
     BRIEF SUMMARY 
     One or more embodiments disclosed within this specification relate to managing reusable artifacts. 
     A system includes a processor programmed to initiate executable operations. The executable operations include, responsive to receiving a request to create a placeholder for a reusable artifact representing a reusable unit, creating the placeholder for an appropriate version of the reusable artifact within a container and assigning a first parameter identifying the reusable artifact to an artifact property of the placeholder, The executable operations also can include, responsive to receiving a request to pin a particular version of the reusable artifact to the placeholder, updating a version property of the placeholder to set the version, wherein the request to pin the particular version of the reusable artifact to the placeholder is implemented by assigning a value to a parameter in the placeholder or adding a pin property into the placeholder. The executable operations also can include maintaining the particular version as the set version of the reusable artifact regardless of whether new artifact versions are created for the reusable artifact. 
     A computer program product for managing reusable artifacts includes a computer readable storage medium having program code stored thereon. The program code is executable by a processor to perform a method. The method includes, responsive to receiving a request to create a placeholder for a reusable artifact representing a reusable unit, by the processor, creating the placeholder for an appropriate version of the reusable artifact within a container and assigning a first parameter identifying the reusable artifact to an artifact property of the placeholder The method also can include, responsive to receiving a request to pin a particular version of the reusable artifact to the placeholder, updating, by the processor, a version property of the placeholder to set the version, wherein the request to pin the particular version of the reusable artifact to the placeholder is implemented by assigning a value to a parameter in the placeholder or adding a pin property into the placeholder. The method also can include maintaining, by the processor, the particular version as the set version of the reusable artifact regardless of whether new artifact versions are created for the reusable artifact. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
         FIG. 1  is a block diagram illustrating a processing system in accordance with an arrangement disclosed within this specification. 
         FIG. 2  is diagram illustrating an example reusable artifact having various versions and branches in accordance with an arrangement disclosed within this specification. 
         FIG. 3  is diagram depicting an example of a container containing a plurality of placeholders in accordance with an arrangement disclosed within this specification. 
         FIG. 4  is diagram illustrating examples reusable artifacts having various versions and branches in accordance with an arrangement disclosed within this specification. 
         FIG. 5  is diagram depicting an example of a container containing a plurality of placeholders in accordance with an arrangement disclosed within this specification. 
         FIG. 6  is a diagram depicting an example of how properties associated with the placeholders of  FIG. 5  resolve to the container. 
         FIG. 7  is a flow chart illustrating a method of managing reusable artifacts in accordance with an arrangement disclosed within this specification. 
     
    
    
     DETAILED DESCRIPTION 
     As will be appreciated by one skilled in the art, aspects of the present invention may be embodied as a system, method or computer program product. Accordingly, aspects of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment (including firmware, resident software, micro-code, etc.) or an embodiment combining software and hardware aspects that may all generally be referred to herein as a “circuit,” “module” or “system.” Furthermore, aspects of the present invention may take the form of a computer program product embodied in one or more computer-readable medium(s) having computer-readable program code embodied, e.g., stored, thereon. Any combination of one or more computer-readable medium(s) may be utilized. The computer-readable medium may be a computer-readable signal medium, a computer-readable storage medium, or a combination thereof. 
     As defined herein, the term “computer-readable storage medium” means a storage medium that contains or stores program code for use by or in connection with an instruction execution system, apparatus, or device. As defined herein, a “computer-readable storage medium” is not a transitory propagating signal per se. A computer-readable storage medium may be, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk drive (HDD), a solid state drive (SSD), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), a digital versatile disc (DVD), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. 
     A computer-readable signal medium may include a propagated data signal with computer-readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer-readable signal medium may be any computer-readable medium that is not a computer-readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. 
     Program code embodied on a computer-readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber, cable, RF, etc., or any suitable combination of the foregoing. Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java™, Smalltalk, C++ or the like and conventional procedural programming languages, such as the “C” programming language or similar programming languages. The program code may execute entirely on the user&#39;s computer, partly on the user&#39;s computer, as a stand-alone software package, partly on the user&#39;s computer and partly on a remote computer, or entirely on the remote computer or server. In the latter scenario, the remote computer may be connected to the user&#39;s computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet Service Provider). 
     Aspects of the present invention are described below with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer, other programmable data processing apparatus, or other devices create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. 
     These computer program instructions may also be stored in a computer-readable medium that can direct a computer, other programmable data processing apparatus, or other devices to function in a particular manner, such that the instructions stored in the computer-readable medium produce an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks. 
     The computer program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. 
     For purposes of simplicity and clarity of illustration, elements shown in the figures have not necessarily been drawn to scale. For example, the dimensions of some of the elements may be exaggerated relative to other elements for clarity. Further, where considered appropriate, reference numbers are repeated among the figures to indicate corresponding, analogous, or like features. 
     Arrangements described herein relate to managing reusable artifacts. Specifically, reusable artifacts, each of which may contain various versions and/or variants, are easily managed or interchanged. Moreover, correct versions/variants of the artifacts are automatically selected and dynamically consumed when they become available. A user can control the exact versions/variants of the artifacts that are desired, if needed, all without needing to learn advanced configuration management system concepts, and without need to manage streams or workspaces. 
     Several definitions that apply throughout this document will now be presented. 
     As defined herein, the term “artifact” means a computer-based structure created to represent a reusable unit, such as a product (e.g., an article of manufacture, an application, a service, a system, or the like), a component of an assembly, a component of program code (e.g., a function, a method, a module, etc.), a component of a document (e.g., a section, a chapter, etc.), etc. An artifact, for instance, can comprise information (e.g., data) pertaining to a reusable unit that may be reused among different assemblies, different groups of program code, etc. Moreover, an artifact can be a tangible object or an intangible object. Examples of an artifact include, but are not limited to, a product identification, a product specification, a drawing (e.g., a computer-aided design (CAD) drawing), a bill of materials, a procedure, computer-program code (e.g., a modules, routine, sub-routine, or the like), marketing material, and the like. 
     An artifact can be associated with one or more other artifacts, such as parent and/or one or more child artifacts. In illustration, artifacts can be associated with one another in a hierarchy comprising a first parent artifact having one or more children artifacts, and one or more of the children artifacts themselves can be parent artifacts to other children artifacts. For example, a parent artifact can be a product identification, and the parent artifact can be associated with children artifacts corresponding to the product, for example a product specification, identifiers for components of the product (e.g., a bill of materials), drawings of the product, drawings of components of the product, etc. An artifact which is a parent to other artifacts also can be a child artifact to its parent artifact. For example, an artifact can be an identifier for a component of the product, and thus be a child artifact to the artifact representing the product, but also have children artifacts, for example drawings, specifications, etc. for the component, and children artifacts for sub-components of the component, and so on. 
     As defined herein, the term “object version,” “version of an object,” or the like means a particular form of a reusable object differing in certain respects from an earlier form or other forms of the same type of reusable object. 
     As defined herein, the term “abstract version,” “version of an abstract,” or the like means a particular form of an abstract representing a particular form of a reusable object differing in certain respects from an earlier form or other forms of the same type of reusable object. 
     As defined herein, the term “branch” means a set of one or more abstract versions, wherein the set of one or more abstract versions represents a particular variant of a reusable object. If an artifact includes a plurality of branches, each branch represents a different variant of a reusable object. 
       FIG. 1  is a block diagram illustrating a processing system in accordance with one arrangement disclosed within this specification. The processing system  100  can include at least one processor  105  (e.g., a central processing unit) coupled to memory elements  110  through a system bus  115  or other suitable circuitry. As such, the processing system  100  can store program code within the memory elements  110 . The processor  105  can execute the program code accessed from the memory elements  110  via the system bus  115 . It should be appreciated that the processing system  100  can be implemented in the form of any system including a processor and memory that is capable of performing the functions and/or operations described within this specification. For example, the processing system  100  can be implemented as a computer, a workstation, a mobile computer, a laptop computer, tablet computer, a smart phone, a personal digital assistant, a gaming device, an appliance, and so on. 
     The memory elements  110  can include one or more physical memory devices such as, for example, local memory  120  and one or more bulk storage devices  125 . Local memory  120  refers to RAM or other non-persistent memory device(s) generally used during actual execution of the program code. The bulk storage device(s)  125  can be implemented as a hard disk drive (HDD), solid state drive (SSD), or other persistent data storage device. The processing system  100  also can include one or more cache memories (not shown) that provide temporary storage of at least some program code in order to reduce the number of times program code must be retrieved from the bulk storage device  125  during execution. 
     Input/output (I/O) devices such as a display  130 , a pointing device  135  and a keyboard  140  can be coupled to the processing system  100 . The I/O devices can be coupled to the processing system  100  either directly or through intervening I/O controllers. For example, the display  130  can be coupled to the processing system  100  via a graphics processing unit (GPU), which may be a component of the processor  105  or a discrete device. One or more network adapters  145  also can be coupled to processing system  100  to enable processing system  100  to become coupled to other systems, computer systems, remote printers, and/or remote storage devices through intervening private or public networks. Modems, cable modems, transceivers, and Ethernet cards are examples of different types of network adapters  145  that can be used with processing system  100 . 
     As pictured in  FIG. 1 , the memory elements  110  can store a container  150  that contains placeholders  155  for reusable artifacts  160  (hereinafter “artifacts”). The memory elements  110  also can store the artifacts  160 . Being stored in the memory elements  110  when processed by the processor  105 , these components can be considered part of the processing system  100 . Moreover, the container  150 , placeholders  155  and artifacts  160  are functional data structures that impart functionality when employed as part of the processing system  100 . 
     As noted, each artifact  160  represents a reusable unit. A respective placeholder  155  can be created in the container  150  for one or more versions of the artifact  160 . The placeholders  155  can serve to indicate one or more versions of the artifact representing versions and/or variants of the reusable units that are noteworthy, for example versions and/or variants of the reusable units that are used to produce products, assemblies, etc. Each placeholder  155  can include one or more properties, such as an artifact identifier (ID), a version ID and a branch ID, and be assigned to each placeholder  155 . The artifact ID can be the same for all versions of a particular artifact  160 . The version ID can be unique for each version of the artifact  160 . The branch ID can provide a namespace within the artifact  160  to differentiate variants of the particular artifact  160 . A placeholder  155  can select a particular version of the artifact  160  using simple matching rules for the artifact ID, branch ID and version ID. 
     For example, if only an artifact ID is specified for the placeholder  155 , the latest version of the artifact  160 , regardless of its version and branch IDs, can be associated with the placeholder  155 . If an artifact ID and branch ID are specified for the placeholder  155 , the latest version of the artifact  160  in the branch corresponding to the branch ID can be associated with the placeholder  155 . If an artifact ID and version ID are specified for the placeholder  155 , the version of the artifact  160  precisely corresponding to the version ID can be associated with the placeholder  155 . These concepts combine to create a highly flexible automated container to manage various versions and variants of the artifacts. Moreover, the container can identify exactly which reusable artifacts belong in the container, and automatically retrieve updates as new artifact versions are created. Using the methods and processes described herein, the container is assured to choose correct variants and/or versions of artifacts when such artifacts are accessed. 
       FIG. 2  is diagram illustrating an example reusable artifact  200  having various versions and branches in accordance with an arrangement disclosed within this specification. The artifact can have a plurality of versions and branches. In illustration, in a “Yellow” branch, the artifact can include versions 1, 2, 3, 4, 5 and 6. A “Green” branch can branch from version 2 and include versions 2.1, 2.2, 2.3, 2.4, 2.5. A “Blue” branch can branch from version 1, and include versions 1.1, 1.2, 1.3, 1.4. One or more placeholders can be created for one or more versions of the artifact  200 , as discussed with respect to  FIG. 3 . 
       FIG. 3  is diagram  300  depicting an example of a container  310  containing a plurality of placeholders  320 ,  322 ,  324  in accordance with an arrangement disclosed within this specification. Each placeholder  320 ,  322 ,  324  can be assigned two or more parameters. In illustration, each placeholder  320 ,  322 ,  324  can include a property that includes a respective parameter  330 ,  332 ,  334  indicating an artifact for which the placeholder is created. Further, each placeholder  320 ,  322 ,  324  can be assigned a parameter  340 ,  344  indicating a branch of the artifact and/or a parameter  352 ,  354  indicating a specific version of the artifact. In this regard, the placeholder can, for example, include any of the properties identified in Table 1: 
                         TABLE 1               Placeholder           Properties   Behavior                  A: &lt; &gt;: &lt; &gt;   Resolves to the latest version of artifact A on any branch.           (Depending on the implementation, an exception may be           generated if the latest version of artifact is not identifiable.       A: B: &lt; &gt;   Resolves to the latest version of artifact A on branch B.       A: &lt; &gt;: V   Resolves to version V of artifact A.       A: B: V   Resolves to version V of artifact A. If version V is not on           branch B, an exception may be generated.                    
A time property (not shown) also can be included. The time property can be a timestamp that indicates when the corresponding placeholder was created.
 
     In illustration, the placeholder  320  can be include a property “Artifact=1001,” wherein “1001” can be a parameter (e.g., ArtifactID) assigned to the artifact for which the placeholder  320  is created. The placeholder  320  also can include a property “Branch=Yellow,” where “Yellow” can be a parameter (e.g., BranchID) indicating a particular branch of the artifact “1001.” In this example, a version parameter (e.g., VerisonID) may be assigned to a version property  350 , but this is not a requirement. In the case that a version parameter is not assigned to the placeholder  320 , in which the version property  350  can indicate a null value (e.g. “&lt; &gt;”), the latest version on the “Yellow” branch can be associated with that placeholder  320 . If the artifact is later updated with a new version, that new version can be automatically associated with the placeholder  320  by nature of the placeholder  320  not specifying a particular version. In this example, the latest version of the abstract in the “Yellow” branch ( FIG. 2 ) is version 6, thus the placeholder can resolve to version 6 of artifact 1001. 
     In one aspect, a plurality of parameters can be assigned to the branch property  340 . For example, the branch property can indicate “Color=Yellow, Country=Japan.” Thus, if there are variants of the reusable artifact for different countries, such as Japan and the U.S., and for each country there is a “Yellow” branch in addition to other branches, the branch property  340  can indicate the “Yellow” branch for Japan. The present arrangements are not limited to the number of parameters that can be assigned to the branch property. 
     The placeholder  322  can include a property “Artifact=1001,” wherein “1001” can be a parameter assigned to the artifact for which the placeholder  322  is created. The placeholder  322  also can include a property “Version=2.3,” wherein “2.3” can be a parameter indicating a specific version of the artifact “1001.” Since version 2.3 is contained in the “Green” branch ( FIG. 2 ), a parameter indicating the branch need not be assigned to a branch property  342  of the placeholder  322 , in which case the branch property can indicate a null value (e.g. “&lt; &gt;”). In this example, the placeholder  322  can resolve to version 2.3 of artifact 1001. 
     Sometimes, new versions of artifacts are created that are not yet ready to release, or may not be applicable to certain products, processes, etc. Accordingly, a user can choose to pin a particular version to a particular placeholder. In this case, by assigning the version parameter “2.3,” that version of the artifact “1001” can be pinned to the placeholder  322 . In one arrangement, a pin property, such as “Pin=Yes,” can be provided in the placeholder  322  to pin the version “2.3” to the placeholder  322 . When the parameter assigned to the pin property is “Yes,” the version assigned to the version property can be locked so that it is not updateable. If the user desires to unpin the version from the placeholder  322 , the user can request that the parameter assigned to the pin property be changed to “No,” or request that the pin property be removed from the placeholder  322 . In response, the version can be unpinned from the placeholder  322  and the user can be free to update the placeholder  322  with a desired version. 
     The placeholder  324  can include a property “Artifact=1002,” wherein “1002” can be a parameter assigned to the artifact for which the placeholder  322  is created. Since the parameter “1002” is different than the parameter “1001,” the placeholder  322  is created for a different artifact than the placeholders  320 ,  324 . The placeholder  320  also can include a property “Branch=Japan,” where “Japan” can be a parameter indicating a particular branch of the artifact “1002.” Further, the placeholder  322  also can include a property “Version=D9,” wherein “D9” can be a parameter indicating a specific version of the artifact “1002.” In this example, the placeholder  324  can resolve to version D9 of artifact 1002 (not shown in  FIG. 2 ). 
     At any time a user can choose to add new placeholders to the container  310  by generating a request specifying a parameter corresponding to a particular artifact (e.g., ArtifactID). Optionally, one or more additional parameters can be specified. An additional parameter can be a branch identifier (e.g., Branch ID) or a version identifier (e.g., VersionID), or both a branch identifier and a version identifier can be specified. In response to receiving the request, a corresponding new placeholder can be created in the container  310 . Further, the user can choose to remove one or more placeholders or an entire artifact from the container  310 . In the case that the user chooses to remove an artifact, in response to such request, each placeholder associated with the artifact can be automatically removed from the container  310 . 
     In one arrangement, a user can choose to add an empty placeholder to the container  310 , which can be assigned parameters at a later time. In illustration, a user can request an empty placeholder be created and, in response, an empty placeholder can be created. The properties for the empty placeholder can be “Artifact=&lt; &gt;, Branch=&lt; &gt;, Version=&lt; &gt;.” Two or more parameters can be assigned to the placeholder when it is desired to use the placeholder to identify a particular version of an artifact. In another aspect, the user can add an empty placeholder assigned to a particular artifact, but not assign a branch identifier nor a version identifier. In this case, the latest version of the artifact can be assumed. In another aspect, the user can later add a parameter for a branch identifier and/or a parameter for a version identifier at a later point in time. 
     In another arrangement, a user can request that a particular version of an artifact in a particular branch be replaced with another version of the artifact from another branch. In response to such request, at least one parameter assigned to the placeholder (e.g. BranchID and/or VersionID) can be changed/updated. In illustration, if the user chooses to change from version “2.3” to version “2.5” of artifact “1001” assigned to the placeholder  322 , the placeholder  322  can be updated accordingly. 
       FIG. 4  is diagram  400  illustrating examples reusable artifacts having various versions and branches in accordance with an arrangement disclosed within this specification. In this example, the artifacts depicted are an “Engine” with an ArtifactID “E-100”, a “Transmission” with an ArtifactID “T-333” and a “Drive Train” with an ArtifactID “D123”. The artifact E-100 can include a branch  410  including versions “1” and “2” of the engine, and a branch  420  including a version “1.1” of the engine. The versions 1 and 2 can represent versions of a 4-cylinder variant of the engine, and the version 1.1 can represent a 6-cylinder variant of the engine. The artifact T-33 can include a branch  430  including versions “1,” “2” and “3” representing versions of a particular variant of the transmission, and a branch  440  including versions “1.1” and “1.2” representing another variant of the transmission. The artifact D123 can include a branch  450  including versions “1” and “2” of a particular variant of the drive train. 
       FIG. 5  is diagram  500  depicting an example of a container  510  containing a plurality of placeholders  520 ,  522 ,  524  in accordance with an arrangement disclosed within this specification. Reference now is made to  FIGS. 4 and 5 . 
     In this example, the container is titled “IBMSmartCar” and includes a placeholder  520  for the engine used in the “IBMSmartCar.” The placeholder can be titled “Engine,” and can include an artifact property specifying “Artifact=E-100,” a branch property specifying “Branch=4-cylinder,” and a version property specifying “Version=&lt; &gt;,” thus indicating a null value. In this example, the placeholder  520  can resolve to the latest version of the 4-cylinder variant of the E-100 engine, which is version “2”. Since the version is not specified, if a new version of the 4-cylinder variant of the E-100 engine is created, the placeholder  520  can automatically resolve to that new version when the new version is created. 
     The container  510  also can include a placeholder  522  titled “Transmission.” The placeholder  520  can include an artifact property specifying “Artifact=T-333,” a branch property specifying “Branch=sport,” and a version property specifying “Version=1.1.” In this example, the placeholder  522  can resolve to version 1.1 of the T-333 transmission. 
     The container  510  also can include a placeholder  522  titled “Drive Train.” The placeholder  522  can include an artifact property specifying “Artifact=D123,” a branch property specifying “Branch=&lt; &gt;,” and a version property specifying “Version=&lt; &gt;.” In this example, the placeholder  524  can resolve to version 2 of the D123 drive train. Since only one branch  450  exists for the artifact D123, the branch property need not specify a branch—the branch that exists can be assumed. Further, since a version is not specified in the version property, the latest version can be assumed. Again, since the version is not specified, if a new version of the D123 drive train is created, the placeholder  530  can automatically resolve to that new version when the new version is created. 
       FIG. 6  is a diagram  600  depicting an example of how properties associated with the placeholders  520  of  FIG. 5  resolve to the container  510 . Specifically, the artifact for version 2 of the 4-cylinder E-100 engine can be associated with the container  510  and depicted in a respective placeholder  610 , the artifact for version 1.1 of the second variant of the T-333 transmission can be associated with the container  510  and depicted in a respective placeholder  620 , and version 2 of the D123 drive train can be associated with the container  510  and depicted in a respective placeholder  630 . The diagram  600 , including a the container  510  and the placeholders  610 - 630 , can be presented to a user to indicate the reusable units being used for the unit for which the container  510  has been created, in this case the “IBMSmartCar.” The diagram  600  can be depicted on a display, a printout, or in any other suitable manner. As noted, a user can change or update the placeholders as described herein. Moreover, the diagram  600  can be dynamically updated when any properties of the placeholders  520 - 524  are updated, or new versions of artifacts are created and the placeholder properties resolve to the new versions. 
       FIG. 7  is a flow chart illustrating a method of  700  managing reusable artifacts in accordance with an arrangement disclosed within this specification. At step  702 , a request to create a placeholder for a reusable artifact representing a reusable unit can be received. The request can include a parameter identifying the reusable artifact. Referring to decision box  704 , a determination can be made as to whether the request includes a parameter indicating a particular version of the reusable artifact. If so, at step  706 , a placeholder for an appropriate version of the reusable artifact can be created within a container. The properties of the placeholder can resolve to a version of the reusable artifact indicated by the version parameter, which is the appropriate version of the artifact. 
     If the request does not include a parameter indicating a particular version of the reusable artifact, the process can proceed to decision box  708 . At decision box  708 , a determination can be made as to whether the request includes one or more parameters indicating a particular branch of the reusable artifact. If so, at step  710 , a placeholder for an appropriate version of the reusable artifact can be created within the container. In this case, the properties of the placeholder can resolve to a latest version of the reusable artifact in a particular branch indicted by the branch parameter(s), which is the appropriate version of the artifact. If, however, both a branch identifier and a version identifier are provided, then the properties can resolve to a version matching the version identifier that is in a branch matching the branch identifier. 
     If the request does not include one or more parameters indicating a particular branch of the reusable artifact, at step  712  an empty placeholder can be created. In one arrangement, the empty placeholder can be associated with the reusable artifact identified by the artifact parameter. A parameter identifying a particular branch of the artifact and/or a parameter identifying a particular version can be of the artifact can be added to the placeholder at a later time. If a placeholder creation request is received that does not include a parameter identifying a particular reusable artifact, an association of the placeholder with a particular artifact would not take place, and can be created at a later time. 
     The flowchart and block diagrams in the Figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions. 
     The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “includes,” “including,” “comprises,” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. 
     Reference throughout this specification to “one embodiment,” “an embodiment,” or similar language means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment disclosed within this specification. Thus, appearances of the phrases “in one embodiment,” “in an embodiment,” and similar language throughout this specification may, but do not necessarily, all refer to the same embodiment. 
     The term “plurality,” as used herein, is defined as two or more than two. The term “another,” as used herein, is defined as at least a second or more. The term “coupled,” as used herein, is defined as connected, whether directly without any intervening elements or indirectly with one or more intervening elements, unless otherwise indicated. Two elements also can be coupled mechanically, electrically, or communicatively linked through a communication channel, pathway, network, or system. The term “and/or” as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items. It will also be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms, as these terms are only used to distinguish one element from another unless stated otherwise or the context indicates otherwise. 
     The term “if” may be construed to mean “when” or “upon” or “in response to determining” or “in response to detecting,” depending on the context. Similarly, the phrase “if it is determined” or “if [a stated condition or event] is detected” may be construed to mean “upon determining” or “in response to determining” or “upon detecting [the stated condition or event]” or “in response to detecting [the stated condition or event],” depending on the context. 
     The corresponding structures, materials, acts, and equivalents of all means or step plus function elements in the claims below are intended to include any structure, material, or act for performing the function in combination with other claimed elements as specifically claimed. The description of the embodiments disclosed within this specification have been presented for purposes of illustration and description, but are not intended to be exhaustive or limited to the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the embodiments of the invention. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the inventive arrangements for various embodiments with various modifications as are suited to the particular use contemplated.