| <?xml version="1.0" encoding="UTF-8"?> |
| <org.eclipse.epf.uma:TaskDescription xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:org.eclipse.epf.uma="http://www.eclipse.org/epf/uma/1.0.6/uma.ecore" xmlns:epf="http://www.eclipse.org/epf" epf:version="1.5.1" xmlns:rmc="http://www.ibm.com/rmc" rmc:version="7.5.1" xmi:id="_rUis8LBKEdm7Eph_l9Cn9w" name="refine_the_arch,_0gRJgMlgEdmt3adZL5Dmdw" guid="_rUis8LBKEdm7Eph_l9Cn9w" changeDate="2008-08-08T11:29:21.000-0700" version="1.0.0"> |
| <mainDescription><p>
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| This task&nbsp;builds upon the outlined architecture and makes concrete and unambiguous architectural decisions to
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| support development.&nbsp; It takes into&nbsp;account any design and implementation work products that have been
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| developed so far.&nbsp; In other words, the architecture evolves as the solution is designed and implemented, and the
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| architecture documentation is updated to reflect any changes made during development. This is&nbsp;a key,&nbsp;since
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| the actual implementation is the only real "proof" that the software architecture is viable and provides the definitive
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| basis for validating the suitability&nbsp;of the architecture.&nbsp; For more information, see <a
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| class="elementLinkWithType"
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| href="./../../core.tech.common.extend_supp/guidances/concepts/executable_arch_D4E68CBD.html"
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| guid="_O1kAANvfEduv2KOT-Teh6w">Concept: Executable Architecture</a>.
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| </p>
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| <p>
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| The results are captured for future reference and are communicated across the team.
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| </p></mainDescription> |
| <keyConsiderations><p>
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| It is important to continue to reduce the complexity of the&nbsp;solution by raising the levels of abstraction.&nbsp;
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| For more information, see <a class="elementLinkWithType"
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| href="./../../core.tech.common.extend_supp/guidances/guidelines/abstract_away_complexity_DBF13AE6.html"
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| guid="_we3F4ACpEdu8m4dIntu6jA">Guideline: Abstract Away Complexity</a>.
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| </p>
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| <p>
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| Continue the collaboration with the whole&nbsp;team on the refining of the architecture in order to promote consensus
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| and a common understanding of the overall solution. The architect should be working to coordinate and guide the
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| technical activities of the team rather than doing all the work alone.&nbsp;Place special emphasis&nbsp;on
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| involving&nbsp;the developer(s) throughout this task since it's the developed solution that will prove out the
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| architecture and may result in refinements to the architecture documentation.
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| </p>
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| <p>
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| Ensure that those who need to act upon the architectural work&nbsp;understand&nbsp;it and are able to work with
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| it.&nbsp;Make sure that the description of the architecture clearly conveys not only the solution but also the
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| motivation and objectives related to the&nbsp;decisions that have been made in shaping the architecture. This will make
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| it easier for others to understand the architecture and to adapt it over time.
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| </p>
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| <p>
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| You can communicate your decisions as many ways as you wish.&nbsp; For example:
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| </p>
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| <ul>
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| <li>
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| Publication of&nbsp;reference source code
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| </li>
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| <li>
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| Publication of&nbsp;reference models
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| </li>
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| <li>
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| Publication of&nbsp;software architecture documentation
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| </li>
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| <li>
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| Formal&nbsp;presentations of the material
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| </li>
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| <li>
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| Informal walkthroughs of the architecture
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| </li>
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| </ul></keyConsiderations> |
| <sections xmi:id="_l92AYNpaEdyP58ppo1Ieaw" name="Refine the architectural goals and architecturally-significant requirements" guid="_l92AYNpaEdyP58ppo1Ieaw"> |
| <sectionDescription><p>
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| Work with the team, especially the stakeholders and the requirements team, to review the status of the <a
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| class="elementLink" href="./../../core.tech.common.extend_supp/guidances/concepts/arch_goals_CB41D8AE.html"
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| guid="_HlRqANpbEdyP58ppo1Ieaw">Architectural Goals</a>&nbsp;and <a class="elementLink"
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| href="./../../core.tech.common.extend_supp/guidances/concepts/arch_significant_requirements_1EE5D757.html"
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| guid="_HrZGIA4MEduibvKwrGxWxA">Architecturally Significant Requirements</a>&nbsp;and refine them as needed. It may be
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| that some new architecturally-significant requirements have been introduced or your architectural goals and priorities
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| may have changed.
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| </p>
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| <p>
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| The development work performed so far will also inform the decisions and goals you've identified. Use information from
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| designing and implementing the system so far to adjust and refined those decisions and goals.
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| </p></sectionDescription> |
| </sections> |
| <sections xmi:id="_G_k1kBaqEduSTJywppIxVQ" name="Identify architecturally significant design elements" guid="_G_k1kBaqEduSTJywppIxVQ"> |
| <sectionDescription><p align="left">
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| Identify concrete&nbsp;design elements (such as <a class="elementLink"
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| href="./../../core.tech.common.extend_supp/guidances/concepts/component_CB167D48.html"
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| guid="_0YP18MlgEdmt3adZL5Dmdw">Component</a>s, classes and&nbsp;subsystems)&nbsp;and provide at least a name and brief
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| description for each.
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| </p>
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| <p align="left">
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| The following are some good sources for design elements:
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| </p>
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| <ul>
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| <li>
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| <div align="left">
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| <div align="left">
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| <a class="elementLink"
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| href="./../../core.tech.common.extend_supp/guidances/concepts/arch_significant_requirements_1EE5D757.html"
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| guid="_HrZGIA4MEduibvKwrGxWxA">Architecturally Significant Requirements</a>. Highlight the areas of the
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| architecture that participate in realizing, or implementing, the requirements.
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| </div>
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| </div>
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| </li>
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| <li>
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| <div align="left">
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| <div align="left">
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| <a class="elementLink"
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| href="./../../core.tech.common.extend_supp/guidances/concepts/key_abstractions_1474DBF2.html"
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| guid="_pLEGUNqGEdy88NBoQgfGyg">Key Abstractions</a>
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| </div>
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| </div>
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| </li>
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| <li>
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| <div align="left">
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| <div align="left">
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| Components that encapsulate the system's interface with external systems.&nbsp; For more information, see
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| <a class="elementLinkWithType"
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| href="./../../core.tech.common.extend_supp/guidances/guidelines/repres_interfaces_to_ext_systems_51A34F6E.html"
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| guid="_0gjdYMlgEdmt3adZL5Dmdw">Guideline: Representing Interfaces to External Systems</a>
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| </div>
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| </div>
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| </li>
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| <li>
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| Components that implement the <a class="elementLink"
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| href="./../../core.tech.common.extend_supp/guidances/concepts/arch_mechanism_2932DFB6.html"
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| guid="_mzxI0A4LEduibvKwrGxWxA">Architectural Mechanism</a>s
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| </li>
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| <li>
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| Architectural and key design <a class="elementLink"
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| href="./../../core.tech.common.extend_supp/guidances/concepts/pattern_10BE6D96.html"
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| guid="_0YJvUMlgEdmt3adZL5Dmdw">Pattern</a>s. Apply the chosen patterns to define a new set of elements that conform
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| to the patterns.
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| </li>
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| </ul>
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| <p>
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| Identifying components will help hide the complexity of the system and help you work at a higher level. Components need
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| to be internally cohesive and to provide external services through a limited interface.&nbsp; At this point, interfaces
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| do not need to be as detailed as a signature, but they do need to document what the elements need, what they can use,
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| and what they can depend on.
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| </p>
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| <p>
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| Component identification can be&nbsp;based on architectural layers, deployment choices, or key abstractions. Ask
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| yourself these questions:
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| </p>
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| <ul>
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| <li>
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| What is logically or functionally related (same use case or service, for example)?
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| </li>
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| <li>
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| What entities provide services to multiple others?
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| </li>
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| <li>
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| What entities depend on each other? Strongly or weakly?
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| </li>
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| <li>
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| What entities should you be able to exchange independently from others?
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| </li>
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| <li>
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| What will run on the same processor or network node?
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| </li>
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| <li>
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| What parts are constrained by similar performance requirements?
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| </li>
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| </ul>
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| <p>
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| When you identify a component be sure to briefly describe the functionality that should be allocated to the components.
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| </p></sectionDescription> |
| </sections> |
| <sections xmi:id="_0qoQ8CikEduQBKSg5n118w" name="Refine architectural mechanisms" guid="_0qoQ8CikEduQBKSg5n118w"> |
| <sectionDescription><p>
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| Refine&nbsp;the applicable <a class="elementLink"
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| href="./../../core.tech.common.extend_supp/guidances/concepts/arch_mechanism_2932DFB6.html"
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| guid="_mzxI0A4LEduibvKwrGxWxA">Architectural Mechanism</a>s, as needed to support the design.&nbsp; For example,
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| refining an analysis mechanism into a design mechanism and/or refining a design mechanism into an implementation
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| mechanism.&nbsp;<br />
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| </p></sectionDescription> |
| </sections> |
| <sections xmi:id="_82iI0FHOEd2zrOgIte8oWg" name="Define development architecture and test architecture" guid="_82iI0FHOEd2zrOgIte8oWg"> |
| <sectionDescription>Ensure that the development and test architectures are defined. Note any architecturally significant differences between
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| these environments and work with the team to devise strategies to mitigate any risks these may introduce.</sectionDescription> |
| </sections> |
| <sections xmi:id="_Vdln8MP3EdmWKcx6ixEiwg" name="Identify additional reuse opportunities" guid="_Vdln8MP3EdmWKcx6ixEiwg"> |
| <sectionDescription><p dir="ltr" style="MARGIN-RIGHT: 0px">
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| Continue to look for more opportunities to reuse existing assets.&nbsp; Where applicable, identify existing components
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| that could be built to be reused.
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| </p>
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| <p dir="ltr" style="MARGIN-RIGHT: 0px">
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| For more information, see <a class="elementLinkWithType"
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| href="./../../core.tech.common.extend_supp/guidances/guidelines/software_reuse_B6B04C26.html"
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| guid="_vO2uoO0OEduUpsu85bVhiQ">Guideline: Software Reuse</a>.
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| </p></sectionDescription> |
| </sections> |
| <sections xmi:id="_GFLpsFHPEd2zrOgIte8oWg" name="Validate the architecture" guid="_GFLpsFHPEd2zrOgIte8oWg"> |
| <sectionDescription>Make sure that the architecture supports the requirements and the needs of the team. <br />
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| <br />
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| Development work should be performed to produce just enough working software to show that the architecture is viable. This
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| should provide the definitive basis for validating the suitability of the architecture. As the software should be developed
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| iteratively, more than one increment of the build may be required to prove the architecture. During the early stages of the
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| project it may be acceptable for the software to have a incomplete or prototypical feel, as it will be primarily concerned
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| with baselining the architecture to provide a stable foundation for the remaining development work.</sectionDescription> |
| </sections> |
| <sections xmi:id="_xIIVkMUbEdu5GrwIlTJV7g" name="Map the software to the hardware" guid="_xIIVkMUbEdu5GrwIlTJV7g"> |
| <sectionDescription><p align="left">
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| Map the architecturally significant design elements to the target deployment environment. Work with hardware and
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| network specialists to ensure that the hardware is sufficient to meet the needs of the system; and that any new
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| hardware is available in time.
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| </p></sectionDescription> |
| </sections> |
| <sections xmi:id="_pyyVoFHPEd2zrOgIte8oWg" name="Communicate decisions" guid="_pyyVoFHPEd2zrOgIte8oWg"> |
| <sectionDescription>Ensure that those who need to act upon the architectural work understand it and are able to work with it. Make sure that
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| the description of the architecture clearly conveys not only the solution but also the motivation and objectives related to
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| the decisions that have been made in shaping the architecture. This will make it easier for others to understand the
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| architecture and to adapt it over time.</sectionDescription> |
| </sections> |
| <purpose>To make and document the architectural decisions necessary to support development.</purpose> |
| </org.eclipse.epf.uma:TaskDescription> |
