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| <label for=m-enoverviewtaskskubernetes-check><a href=/en/overview/tasks/kubernetes/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-enoverviewtaskskubernetes><span>Kubernetes Deployment Solution</span></a></label><ul class="ul-3 foldable"><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enoverviewtaskskubernetesdeploy-on-k8s-li><input type=checkbox id=m-enoverviewtaskskubernetesdeploy-on-k8s-check> |
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| <label for=m-enoverviewtasksmesh-check><a href=/en/overview/tasks/mesh/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-enoverviewtasksmesh><span>Mesh Deployment Solution</span></a></label><ul class="ul-3 foldable"><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enoverviewtasksmeshdubbo-mesh-li><input type=checkbox id=m-enoverviewtasksmeshdubbo-mesh-check> |
| <label for=m-enoverviewtasksmeshdubbo-mesh-check><a href=/en/overview/tasks/mesh/dubbo-mesh/ title="Dubbo proxy mesh using Envoy & Istio" class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enoverviewtasksmeshdubbo-mesh><span>Sidecar mode</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enoverviewtasksmeshproxyless-li><input type=checkbox id=m-enoverviewtasksmeshproxyless-check> |
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| <label for=m-enoverviewtaskstriple-check><a href=/en/overview/tasks/triple/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-enoverviewtaskstriple><span>Triple Usage Example</span></a></label><ul class="ul-3 foldable"><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enoverviewtaskstripleidl-li><input type=checkbox id=m-enoverviewtaskstripleidl-check> |
| <label for=m-enoverviewtaskstripleidl-check><a href=/en/overview/tasks/triple/idl/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enoverviewtaskstripleidl><span>Using IDL + Protobuf to define services across languages</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enoverviewtaskstriplewrap-li><input type=checkbox id=m-enoverviewtaskstriplewrap-check> |
| <label for=m-enoverviewtaskstriplewrap-check><a href=/en/overview/tasks/triple/wrap/ title="Pojo Serialization Compatibility Mode" class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enoverviewtaskstriplewrap><span>Pojo serialization compatibility mode</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enoverviewtaskstriplestreaming-li><input type=checkbox id=m-enoverviewtaskstriplestreaming-check> |
| <label for=m-enoverviewtaskstriplestreaming-check><a href=/en/overview/tasks/triple/streaming/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enoverviewtaskstriplestreaming><span>Streaming communication mode</span></a></label></li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-enoverviewtasksmigration-li><input type=checkbox id=m-enoverviewtasksmigration-check> |
| <label for=m-enoverviewtasksmigration-check><a href=/en/overview/tasks/migration/ title="How to smoothly migrate to the new functions of Dubbo3" class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-enoverviewtasksmigration><span>Migrate to Dubbo3</span></a></label><ul class="ul-3 foldable"><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enoverviewtasksmigration2to3-li><input type=checkbox id=m-enoverviewtasksmigration2to3-check> |
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| <label for=m-enoverviewtasksmigrationmigration-triple-check><a href=/en/overview/tasks/migration/migration-triple/ title="Guide to Migrating Dubbo Protocol to Triple Protocol" class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enoverviewtasksmigrationmigration-triple><span>Triple Protocol</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enoverviewtasksmigrationservice-discovery-samples-li><input type=checkbox id=m-enoverviewtasksmigrationservice-discovery-samples-check> |
| <label for=m-enoverviewtasksmigrationservice-discovery-samples-check><a href=/en/overview/tasks/migration/service-discovery-samples/ title="Dubbo3 application-level service discovery" class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enoverviewtasksmigrationservice-discovery-samples><span>Application-Level Service Discovery</span></a></label></li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-enoverviewtasksecosystem-li><input type=checkbox id=m-enoverviewtasksecosystem-check> |
| <label for=m-enoverviewtasksecosystem-check><a href=/en/overview/tasks/ecosystem/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-enoverviewtasksecosystem><span>Microservice Governance</span></a></label><ul class="ul-3 foldable"><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enoverviewtasksecosystemtransaction-li><input type=checkbox id=m-enoverviewtasksecosystemtransaction-check> |
| <label for=m-enoverviewtasksecosystemtransaction-check><a href=/en/overview/tasks/ecosystem/transaction/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enoverviewtasksecosystemtransaction><span>Transaction Management</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enoverviewtasksecosystemrate-limit-li><input type=checkbox id=m-enoverviewtasksecosystemrate-limit-check> |
| <label for=m-enoverviewtasksecosystemrate-limit-check><a href=/en/overview/tasks/ecosystem/rate-limit/ title="Current Limit Downgrade" class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enoverviewtasksecosystemrate-limit><span>Current limit downgrade</span></a></label></li></ul></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section with-child" id=m-enoverviewtasksextensibility-li><input type=checkbox id=m-enoverviewtasksextensibility-check> |
| <label for=m-enoverviewtasksextensibility-check><a href=/en/overview/tasks/extensibility/ class="align-left pl-0 td-sidebar-link td-sidebar-link__section" id=m-enoverviewtasksextensibility><span>Custom Extensions</span></a></label><ul class="ul-3 foldable"><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enoverviewtasksextensibilityprotocol-li><input type=checkbox id=m-enoverviewtasksextensibilityprotocol-check> |
| <label for=m-enoverviewtasksextensibilityprotocol-check><a href=/en/overview/tasks/extensibility/protocol/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enoverviewtasksextensibilityprotocol><span>Protocol</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enoverviewtasksextensibilityregistry-li><input type=checkbox id=m-enoverviewtasksextensibilityregistry-check> |
| <label for=m-enoverviewtasksextensibilityregistry-check><a href=/en/overview/tasks/extensibility/registry/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enoverviewtasksextensibilityregistry><span>Registry</span></a></label></li><li class="td-sidebar-nav__section-title td-sidebar-nav__section without-child" id=m-enoverviewtasksextensibilityrouter-li><input type=checkbox id=m-enoverviewtasksextensibilityrouter-check> |
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| <label for=m-enoverviewnoticeslog4j-check><a href=/en/overview/notices/log4j/ class="align-left pl-0 td-sidebar-link td-sidebar-link__page" id=m-enoverviewnoticeslog4j><span>Log4j vulnerability impact</span></a></label></li></ul></li></ul></li></ul></nav></div></div><main class="col-12 col-md-9 col-xl-8 pl-md-5" role=main><nav aria-label=breadcrumb class=td-breadcrumbs><ol class=breadcrumb><li class=breadcrumb-item><a href=https://cn.dubbo.apache.org/en/overview/>Overview</a></li><li class=breadcrumb-item><a href=https://cn.dubbo.apache.org/en/overview/tasks/>Tasks</a></li><li class="breadcrumb-item active" aria-current=page><a href=https://cn.dubbo.apache.org/en/overview/tasks/extensibility/ aria-disabled=true class="btn-link disabled">Custom Extensions</a></li></ol></nav><div class=td-content><h1>Custom Extensions</h1><div class=lead>Demonstrates how to use Dubbo’s extensibility features.</div><header class=article-meta></header><h2 id=dubbos-extensibility-design-philosophy>Dubbo’s Extensibility Design Philosophy</h2><ul><li>Equality towards third-party implementations: In Dubbo, all internal and external implementations are treated equally. Users can replace Dubbo’s native implementations based on their business requirements.</li><li>Each extension point encapsulates only one variable factor for maximum reuse: The implementer of each extension point is often only concerned with one thing. If users need to extend functionality, they only need to extend the relevant extension points, significantly reducing the workload.</li></ul><h2 id=java-spi-based-extensibility-design>Java SPI-based Extensibility Design</h2><p>Dubbo’s extensibility comes from an enhanced version of the JDK standard SPI (Service Provider Interface). It improves upon the following issues with the JDK’s standard SPI:</p><ul><li>The standard SPI instantiates all extension points at once, wasting resources if some are not used.</li><li>If extension point loading fails, even the name of the extension point cannot be retrieved.</li></ul><p>Dubbo’s extensibility features:</p><ul><li>On-demand loading: Dubbo doesn’t instantiate all implementations at once, reducing resource waste.</li><li>IOC (Inversion of Control) capabilities: Dubbo not only discovers extension service implementation classes but also automatically injects dependent objects into the extension class.</li><li>AOP (Aspect-Oriented Programming) capabilities: Dubbo automatically discovers wrapper classes for extensions, constructing them to enhance extension functionality.</li><li>Dynamic extension selection: Dubbo dynamically chooses the corresponding extension class based on parameters at runtime.</li><li>Extension implementation sorting: Users can specify the execution order of extension implementations.</li><li>Adaptive extension points: Extensions can be made effective on either the consumer or provider side.</li></ul><h3 id=extension-loading-process>Extension Loading Process</h3><p>Dubbo’s extension loading process is as follows:</p><p><img src=/imgs/v3/concepts/extension-load.png alt=//imgs/v3/concepts/extension-load.png></p><p>The main steps are:</p><ul><li>Read and parse the configuration file</li><li>Cache all extension implementations</li><li>Instantiate the corresponding extension implementation based on the user-executed extension name</li><li>Perform IOC injection for extension instance attributes and instantiate extension wrapper classes for AOP features</li></ul><h2 id=task-items>Task Items</h2><p>Next, let’s introduce Dubbo’s extensibility features through the following task items.</p><section id=section-0><div class="td-content list-page"><div class=lead></div><header class=article-meta></header><div class=row><div class="col-sm col-md-6 mb-4"><div class="h-100 card shadow" href=#><div class=card-body><h4 class=card-title><a href=/en/overview/tasks/extensibility/filter/>Custom Filters</a></h4><p>Dynamically load custom filters through the SPI mechanism to uniformly handle, validate returned results, and minimize developer interruptions.</p></div></div></div><div class="col-sm col-md-6 mb-4"><div class="h-100 card shadow"><div class=card-body><h4 class=card-title><a href=/en/overview/tasks/extensibility/router/>Custom Routing</a></h4><p>Customize routing strategies during service invocation based on actual use-cases to effectively improve service throughput and latency.</p></div></div></div><div class="col-sm col-md-6 mb-4"><div class="h-100 card shadow"><div class=card-body><h4 class=card-title><a href=/en/overview/tasks/extensibility/protocol/>Custom Protocols</a></h4><p>Use custom transport protocols for different heterogeneous systems to eliminate the differences between protocols and facilitate system integration.</p></div></div></div><div class="col-sm col-md-6 mb-4"><div class="h-100 card shadow"><div class=card-body><h4 class=card-title><a href=/en/overview/tasks/extensibility/registry/>Custom Registry Centers</a></h4><p>Include services from different registry centers into the Dubbo ecosystem. Customizing registry centers is a key to bridging different service ecosystems.</p></div></div></div></div><hr></div></section><p>Dubbo’s extensibility design aims to provide users with a highly flexible extension mechanism, offering features like dynamic extension selection, IOC, and AOP. This makes it easier to adapt Dubbo to various scenarios and integrate it into different technology stacks.</p><div class=section-index></div><div id=pre-footer><h2>Feedback</h2><p class=feedback--prompt>Was this page helpful?</p><button class="btn btn-primary mb-4 feedback--yes">Yes</button> |
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