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theme-doc-toc-mobile tocMobile_Tx6Y"><button type="button" class="clean-btn tocCollapsibleButton_zr6a">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>EngineConn architecture design</h1></header><p>EngineConn: Engine connector, a module that provides functions such as unified configuration management, context service, physical library, data source management, microservice management, and historical task query for other microservice modules.</p><p>EngineConn architecture diagram</p><p><img alt="EngineConn" src="/assets/images/engineconn-01-ae1b256647d437b3e9f9323b0c762e17.png"></p><header><h1>Introduction to the second-level module:</h1></header><h2><a aria-hidden="true" tabindex="-1" class="anchor anchor__h2 anchorWithStickyNavbar_y2LR" id="linkis-computation-engineconn-interactive-engine-connector"></a>linkis-computation-engineconn interactive engine connector<a class="hash-link" href="#linkis-computation-engineconn-interactive-engine-connector" title="Direct link to heading">#</a></h2><p>The ability to provide interactive computing tasks.</p><table><thead><tr><th>Core class</th><th>Core function</th></tr></thead><tbody><tr><td>EngineConnTask</td><td>Defines the interactive computing tasks submitted to EngineConn</td></tr><tr><td>ComputationExecutor</td><td>Defined interactive Executor, with interactive capabilities such as status query and task kill.</td></tr><tr><td>TaskExecutionService</td><td>Provides management functions for interactive computing tasks</td></tr></tbody></table><h2><a aria-hidden="true" tabindex="-1" class="anchor anchor__h2 anchorWithStickyNavbar_y2LR" id="linkis-engineconn-common-engine-connector-common-module"></a>linkis-engineconn-common engine connector common module<a class="hash-link" href="#linkis-engineconn-common-engine-connector-common-module" title="Direct link to heading">#</a></h2><p>Define the most basic entity classes and interfaces in the engine connector. EngineConn is used to create a connection session for the underlying computing storage engine, which contains the session information between the engine and the specific cluster, and is the client that communicates with the specific engine.</p><table><thead><tr><th>Core Service</th><th>Core function</th></tr></thead><tbody><tr><td>EngineCreationContext</td><td>Contains the context information of EngineConn during startup</td></tr><tr><td>EngineConn</td><td>Contains the specific information of EngineConn, such as type, specific connection information with layer computing storage engine, etc.</td></tr><tr><td>EngineExecution</td><td>Provide Executor creation logic</td></tr><tr><td>EngineConnHook</td><td>Define the operations before and after each phase of engine startup</td></tr></tbody></table><h2><a aria-hidden="true" tabindex="-1" class="anchor anchor__h2 anchorWithStickyNavbar_y2LR" id="the-core-logic-of-linkis-engineconn-core-engine-connector"></a>The core logic of linkis-engineconn-core engine connector<a class="hash-link" href="#the-core-logic-of-linkis-engineconn-core-engine-connector" title="Direct link to heading">#</a></h2><p>Defines the interfaces involved in the core logic of EngineConn.</p><table><thead><tr><th>Core class</th><th>Core function</th></tr></thead><tbody><tr><td>EngineConnManager</td><td>Provide related interfaces for creating and obtaining EngineConn</td></tr><tr><td>ExecutorManager</td><td>Provide related interfaces for creating and obtaining Executor</td></tr><tr><td>ShutdownHook</td><td>Define the operation of the engine shutdown phase</td></tr></tbody></table><h2><a aria-hidden="true" tabindex="-1" class="anchor anchor__h2 anchorWithStickyNavbar_y2LR" id="linkis-engineconn-launch-engine-connector-startup-module"></a>linkis-engineconn-launch engine connector startup module<a class="hash-link" href="#linkis-engineconn-launch-engine-connector-startup-module" title="Direct link to heading">#</a></h2><p>Defines the logic of how to start EngineConn.</p><table><thead><tr><th>Core class</th><th>core function</th></tr></thead><tbody><tr><td>EngineConnServer</td><td>EngineConn microservice startup class</td></tr></tbody></table><h2><a aria-hidden="true" tabindex="-1" class="anchor anchor__h2 anchorWithStickyNavbar_y2LR" id="the-core-logic-of-the-linkis-executor-core-executor"></a>The core logic of the linkis-executor-core executor<a class="hash-link" href="#the-core-logic-of-the-linkis-executor-core-executor" title="Direct link to heading">#</a></h2><blockquote><p> Defines the core classes related to the actuator. The executor is a real computing scene executor, responsible for submitting user code to EngineConn.</p></blockquote><table><thead><tr><th>Core class</th><th>Core function</th></tr></thead><tbody><tr><td>Executor</td><td>It is the actual computational logic execution unit and provides a top-level abstraction of the various capabilities of the engine.</td></tr><tr><td>EngineConnAsyncEvent</td><td>Defines EngineConn-related asynchronous events</td></tr><tr><td>EngineConnSyncEvent</td><td>Defines EngineConn-related synchronization events</td></tr><tr><td>EngineConnAsyncListener</td><td>Defines EngineConn related asynchronous event listener</td></tr><tr><td>EngineConnSyncListener</td><td>Defines EngineConn related synchronization event listener</td></tr><tr><td>EngineConnAsyncListenerBus</td><td>Defines the listener bus for EngineConn asynchronous events</td></tr><tr><td>EngineConnSyncListenerBus</td><td>Defines the listener bus for EngineConn synchronization events</td></tr><tr><td>ExecutorListenerBusContext</td><td>Defines the context of the EngineConn event listener</td></tr><tr><td>LabelService</td><td>Provide label reporting function</td></tr><tr><td>ManagerService</td><td>Provides the function of information transfer with LinkisManager</td></tr></tbody></table><h2><a aria-hidden="true" tabindex="-1" class="anchor anchor__h2 anchorWithStickyNavbar_y2LR" id="linkis-callback-service-callback-logic"></a>linkis-callback-service callback logic<a class="hash-link" href="#linkis-callback-service-callback-logic" title="Direct link to heading">#</a></h2><table><thead><tr><th>Core Class</th><th>Core Function</th></tr></thead><tbody><tr><td>EngineConnCallback</td><td>Define EngineConn's callback logic</td></tr></tbody></table><h2><a aria-hidden="true" tabindex="-1" class="anchor anchor__h2 anchorWithStickyNavbar_y2LR" id="linkis-accessible-executor-can-be-accessed-executor"></a>linkis-accessible-executor can be accessed executor<a class="hash-link" href="#linkis-accessible-executor-can-be-accessed-executor" title="Direct link to heading">#</a></h2><p>Executor that can be accessed. You can interact with it through RPC requests to get its status, load, concurrency and other basic indicators Metrics data.</p><table><thead><tr><th>Core Class</th><th>Core Function</th></tr></thead><tbody><tr><td>LogCache</td><td>Provide log cache function</td></tr><tr><td>AccessibleExecutor</td><td>The Executor that can be accessed can interact with it through RPC requests.</td></tr><tr><td>NodeHealthyInfoManager</td><td>Manage Executor's Health Information</td></tr><tr><td>NodeHeartbeatMsgManager</td><td>Manage the heartbeat information of Executor</td></tr><tr><td>NodeOverLoadInfoManager</td><td>Manage Executor load information</td></tr><tr><td>Listener</td><td>Provides events related to Executor and the corresponding listener definition</td></tr><tr><td>EngineConnTimedLock</td><td>Define Executor level lock</td></tr><tr><td>AccessibleService</td><td>Provides the start-stop and status acquisition functions of Executor</td></tr><tr><td>ExecutorHeartbeatService</td><td>Provides heartbeat related functions of Executor</td></tr><tr><td>LockService</td><td>Provide lock management function</td></tr><tr><td>LogService</td><td>Provide log management functions</td></tr></tbody></table></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/apache/incubator-linkis-website/edit/dev/versioned_docs/version-1.1.1/architecture/computation_governance_services/engine/engine_conn.md" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_mS5F" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_mt2f"></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages 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href="#linkis-engineconn-common-engine-connector-common-module" class="table-of-contents__link">linkis-engineconn-common engine connector common module</a></li><li><a href="#the-core-logic-of-linkis-engineconn-core-engine-connector" class="table-of-contents__link">The core logic of linkis-engineconn-core engine connector</a></li><li><a href="#linkis-engineconn-launch-engine-connector-startup-module" class="table-of-contents__link">linkis-engineconn-launch engine connector startup module</a></li><li><a href="#the-core-logic-of-the-linkis-executor-core-executor" class="table-of-contents__link">The core logic of the linkis-executor-core executor</a></li><li><a href="#linkis-callback-service-callback-logic" class="table-of-contents__link">linkis-callback-service callback logic</a></li><li><a href="#linkis-accessible-executor-can-be-accessed-executor" class="table-of-contents__link">linkis-accessible-executor can be accessed 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