Grouping atomic operations - Turn-key research data management repository

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tabindex="0"> <span class="md-ellipsis"> Topic guides </span> <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" data-md-level="2" aria-labelledby="__nav_5_4_label" aria-expanded="true"> <label class="md-nav__title" for="__nav_5_4"> <span class="md-nav__icon md-icon"></span> Topic guides </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../resource/" class="md-nav__link"> <span class="md-ellipsis"> Building resources </span> </a> </li> <li class="md-nav__item"> <a href="../service/" class="md-nav__link"> <span class="md-ellipsis"> Building services </span> </a> </li> <li class="md-nav__item"> <a href="../serializers/" class="md-nav__link"> <span class="md-ellipsis"> Building serializers </span> </a> </li> <li class="md-nav__item md-nav__item--active"> <input class="md-nav__toggle md-toggle" type="checkbox" id="__toc"> <a href="./" class="md-nav__link md-nav__link--active"> <span class="md-ellipsis"> Grouping atomic operations 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data-md-scrollfix> <li class="md-nav__item"> <a href="../../howtos/i18n/" class="md-nav__link"> <span class="md-ellipsis"> Translation (i18n) </span> </a> </li> <li class="md-nav__item"> <a href="../../howtos/custom_fields/" class="md-nav__link"> <span class="md-ellipsis"> Create a new custom field </span> </a> </li> <li class="md-nav__item"> <a href="../../howtos/custom_code/" class="md-nav__link"> <span class="md-ellipsis"> Create custom code and views </span> </a> </li> <li class="md-nav__item"> <a href="../../howtos/add_javascript/" class="md-nav__link"> <span class="md-ellipsis"> Add JavaScript </span> </a> </li> <li class="md-nav__item"> <a href="../../howtos/override_components/" class="md-nav__link"> <span class="md-ellipsis"> Override UI React components </span> </a> </li> <li class="md-nav__item"> <a href="../../howtos/search_terms_migration/" class="md-nav__link"> <span class="md-ellipsis"> Create search terms mappings </span> </a> </li> <li class="md-nav__item"> <a href="../../howtos/alembic/" class="md-nav__link"> <span class="md-ellipsis"> Create a database migration </span> </a> </li> <li class="md-nav__item"> <a href="../../howtos/security-fix/" class="md-nav__link"> <span class="md-ellipsis"> Fix a vulnerability </span> </a> </li> <li class="md-nav__item"> <a href="../../howtos/dev_email/" class="md-nav__link"> <span class="md-ellipsis"> Test emails locally </span> </a> </li> <li class="md-nav__item"> <a href="../../howtos/route_migration/" class="md-nav__link"> <span class="md-ellipsis"> Migrate legacy routes </span> </a> </li> <li class="md-nav__item"> <a href="../../howtos/backup_search_indices/" class="md-nav__link"> <span class="md-ellipsis"> Back up search indices </span> </a> </li> <li class="md-nav__item"> <a href="../../howtos/restrict_access/" class="md-nav__link"> <span class="md-ellipsis"> Restrict access to pages </span> </a> </li> <li class="md-nav__item"> <a href="../../howtos/notifications/" class="md-nav__link"> <span class="md-ellipsis"> Create and configure notifications </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_5_6" > <label class="md-nav__link" for="__nav_5_6" id="__nav_5_6_label" tabindex="0"> <span class="md-ellipsis"> Architecture </span> <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" data-md-level="2" aria-labelledby="__nav_5_6_label" aria-expanded="false"> <label class="md-nav__title" for="__nav_5_6"> <span class="md-nav__icon md-icon"></span> Architecture </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../../architecture/" class="md-nav__link"> <span class="md-ellipsis"> Introduction </span> </a> </li> <li class="md-nav__item"> <a href="../../architecture/infrastructure/" class="md-nav__link"> <span class="md-ellipsis"> Infrastructure </span> </a> </li> <li class="md-nav__item"> <a href="../../architecture/software/" 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href="../../architecture/reading/" class="md-nav__link"> <span class="md-ellipsis"> Recommended reading </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_5_7" > <label class="md-nav__link" for="__nav_5_7" id="__nav_5_7_label" tabindex="0"> <span class="md-ellipsis"> Concepts </span> <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" data-md-level="2" aria-labelledby="__nav_5_7_label" aria-expanded="false"> <label class="md-nav__title" for="__nav_5_7"> <span class="md-nav__icon md-icon"></span> Concepts </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../../concepts/concurrency-control/" class="md-nav__link"> <span class="md-ellipsis"> Optimistic concurrency control </span> </a> </li> <li class="md-nav__item"> <a href="../../concepts/transactions/" class="md-nav__link"> <span class="md-ellipsis"> Database transaction management </span> </a> </li> </ul> </nav> </li> </ul> </nav> </li> <li class="md-nav__item"> <a href="../../../deploy/" class="md-nav__link"> <span class="md-ellipsis"> Deploy </span> </a> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_7" > <label class="md-nav__link" for="__nav_7" id="__nav_7_label" tabindex="0"> <span class="md-ellipsis"> Reference </span> <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_7_label" aria-expanded="false"> <label class="md-nav__title" for="__nav_7"> <span class="md-nav__icon md-icon"></span> Reference </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../../../reference/" class="md-nav__link"> <span class="md-ellipsis"> Overview </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/cli/" class="md-nav__link"> <span class="md-ellipsis"> CLI </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/configuration/" class="md-nav__link"> <span class="md-ellipsis"> Configuration </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/metadata/" class="md-nav__link"> <span class="md-ellipsis"> Metadata </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/metadata/optional_metadata/" class="md-nav__link"> <span class="md-ellipsis"> Optional metadata </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/oai_pmh/" class="md-nav__link"> <span class="md-ellipsis"> OAI-PMH </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/export_formats/" class="md-nav__link"> <span class="md-ellipsis"> Export formats </span> </a> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_7_8" > <label class="md-nav__link" for="__nav_7_8" id="__nav_7_8_label" tabindex="0"> <span class="md-ellipsis"> REST API </span> <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" data-md-level="2" aria-labelledby="__nav_7_8_label" aria-expanded="false"> <label class="md-nav__title" for="__nav_7_8"> <span class="md-nav__icon md-icon"></span> REST API </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../../../reference/rest_api_index/" class="md-nav__link"> <span class="md-ellipsis"> Overview </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_quickstart/" class="md-nav__link"> <span class="md-ellipsis"> Quickstart </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_communities/" class="md-nav__link"> <span class="md-ellipsis"> Communities </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_drafts_records/" class="md-nav__link"> <span class="md-ellipsis"> Drafts and Records </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_groups/" class="md-nav__link"> <span class="md-ellipsis"> Groups </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_members/" class="md-nav__link"> <span class="md-ellipsis"> Members </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_requests/" class="md-nav__link"> <span class="md-ellipsis"> Requests </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_users/" class="md-nav__link"> <span class="md-ellipsis"> Users </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_reviews/" class="md-nav__link"> <span class="md-ellipsis"> Reviews </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_vocabularies/" class="md-nav__link"> <span class="md-ellipsis"> Vocabularies </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_names/" class="md-nav__link"> <span class="md-ellipsis"> Names </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_funders/" class="md-nav__link"> <span class="md-ellipsis"> Funders </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_awards/" class="md-nav__link"> <span class="md-ellipsis"> Awards </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_oaipmh_sets/" class="md-nav__link"> <span class="md-ellipsis"> OAI-PMH Sets </span> </a> </li> <li class="md-nav__item"> <a href="../../../reference/rest_api_statistics/" class="md-nav__link"> <span class="md-ellipsis"> Statistics </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_7_9" > <label class="md-nav__link" for="__nav_7_9" id="__nav_7_9_label" tabindex="0"> <span class="md-ellipsis"> Custom fields </span> <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" data-md-level="2" aria-labelledby="__nav_7_9_label" aria-expanded="false"> <label class="md-nav__title" for="__nav_7_9"> <span class="md-nav__icon md-icon"></span> Custom fields </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../../../reference/custom_fields/widgets/" class="md-nav__link"> <span class="md-ellipsis"> UI widgets </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_7_10" > <label class="md-nav__link" for="__nav_7_10" id="__nav_7_10_label" tabindex="0"> <span class="md-ellipsis"> Administration </span> <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" data-md-level="2" aria-labelledby="__nav_7_10_label" aria-expanded="false"> <label class="md-nav__title" for="__nav_7_10"> <span class="md-nav__icon md-icon"></span> Administration </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../../../reference/administration_reference/" class="md-nav__link"> <span 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md-nav--secondary" aria-label="Table of contents"> </nav> </div> </div> </div> <div class="md-content" data-md-component="content"> <article class="md-content__inner md-typeset"> <h1 id="unit-of-work">Unit of work<a class="headerlink" href="#unit-of-work" title="Permanent link">¶</a></h1> <p>The unit of work is used to group multiple service operations into a single atomic unit. The Unit of Work maintains a list of operations and coordinates the commit, indexing and task execution.</p> <p>The main purpose of the Unit of Work in Invenio is to coordinate when the database transaction commit is called, and ensure tasks that have to run after the transaction are executed (such as indexing and running celery tasks).</p> <p>This ensures that we can group multiple service calls into a single database transaction and perform the necessary indexing/task execution afterwards.</p> <p><strong>When to use?</strong></p> <p>You should use the unit of work instead of running an explicit <code>db.session.commit()</code> or <code>db.session.rollback()</code> in the code. Basically any function where you would normally have called a <code>db.session.commit()</code> should be changed to something like:</p> <div class="highlight"><pre><span></span><code><span class="kn">from</span> <span class="nn">invenio_records_resources.services.uow</span> <span class="kn">import</span> \ <span class="n">RecordCommitOp</span><span class="p">,</span> <span class="n">unit_of_work</span><span class="p">,</span> <span class="nd">@unit_of_work</span><span class="p">()</span> <span class="k">def</span> <span class="nf">create</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">...</span> <span class="p">,</span> <span class="n">uow</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span> <span class="c1"># ...</span> <span class="n">uow</span><span class="o">.</span><span class="n">register</span><span class="p">(</span><span class="n">RecordCommitOp</span><span class="p">(</span><span class="n">record</span><span class="p">,</span> <span class="n">indexer</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">indexer</span><span class="p">))</span> <span class="c1"># ...</span> <span class="c1"># Do not use `db.session.commit()` in service.</span> </code></pre></div> <p>Any private method that need to run operations after the database transaction commit should take the unit of work as input:</p> <div class="highlight"><pre><span></span><code><span class="k">def</span> <span class="nf">_reindex_something</span><span class="p">(</span><span class="n">uow</span><span class="p">,</span> <span class="o">...</span><span class="p">):</span> <span class="c1"># Index after transaction (no record commit)</span> <span class="n">uow</span><span class="o">.</span><span class="n">register</span><span class="p">(</span><span class="n">RecordIndexOp</span><span class="p">(</span><span class="n">record</span><span class="p">))</span> <span class="k">def</span> <span class="nf">_send_a_task</span><span class="p">(</span><span class="n">uow</span><span class="p">,</span> <span class="o">...</span><span class="p">):</span> <span class="c1"># Run a celery task after the database transaction commit.</span> <span class="n">uow</span><span class="o">.</span><span class="n">register</span><span class="p">(</span><span class="n">TaskOp</span><span class="p">(</span><span class="n">my_celery_task</span><span class="p">,</span> <span class="n">myarg</span><span class="p">,</span> <span class="o">...</span> <span class="p">))</span> </code></pre></div> <p><strong>When not to use?</strong></p> <p>If you're not changing the database state there's no need to use the unit of work. Examples include:</p> <ul> <li>Reading a record</li> <li>Search for records</li> <li>Reindex all records - because there's no database transaction involved, and the method is also not intended to be grouped together with multiple other state changing service calls there's no need to use the unit of work.</li> </ul> <p><strong>How to group multiple service calls?</strong></p> <p>In order to group multiple service calls into one atomic operation you can use the following pattern:</p> <div class="highlight"><pre><span></span><code><span class="kn">from</span> <span class="nn">invenio_records_resources.services.uow</span> <span class="kn">import</span> <span class="n">UnitOfWork</span> <span class="k">with</span> <span class="n">UnitOfWork</span><span class="p">()</span> <span class="k">as</span> <span class="n">uow</span><span class="p">:</span> <span class="c1"># Be careful to always inject "uow" to the service. If not, the</span> <span class="c1"># service will create its own unit of work and commit.</span> <span class="n">service</span><span class="o">.</span><span class="n">communities</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="o">...</span><span class="p">,</span> <span class="n">uow</span><span class="o">=</span><span class="n">uow</span><span class="p">)</span> <span class="n">service</span><span class="o">.</span><span class="n">publish</span><span class="p">(</span><span class="o">...</span> <span class="p">,</span> <span class="n">uow</span><span class="o">=</span><span class="n">uow</span><span class="p">)</span> <span class="n">uow</span><span class="o">.</span><span class="n">commit</span><span class="p">()</span> </code></pre></div> <p>If you're not grouping multiple service calls, then simply just call the service method (and it will commit automatically):</p> <div class="highlight"><pre><span></span><code><span class="n">service</span><span class="o">.</span><span class="n">publish</span><span class="p">(</span><span class="o">...</span><span class="p">)</span> </code></pre></div> <p><strong>Writing your own operation?</strong></p> <p>You can write your own unit of work operation by subclassing the operation class and implementing the desired methods:</p> <div class="highlight"><pre><span></span><code><span class="kn">from</span> <span class="nn">invenio_records_resources.services.uow</span> <span class="kn">import</span> <span class="n">Operation</span> <span class="k">class</span> <span class="nc">BulkIndexOp</span><span class="p">(</span><span class="n">Operation</span><span class="p">):</span> <span class="k">def</span> <span class="nf">on_commit</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">uow</span><span class="p">):</span> <span class="c1"># ... executed after the database transaction commit ...</span> </code></pre></div> </article> 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Grouping atomic operations - Turn-key research data management repository