Engine (Apache Tomcat 8.5.55 API Documentation)

org.apache.catalina

## Interface Engine

- All Superinterfaces:
    Container, Lifecycle
  All Known Implementing Classes:
    StandardEngine

      public interface Engine
      extends Container

  An Engine is a Container that represents the entire Catalina servlet engine. It is useful in the following types of scenarios:
  - You wish to use Interceptors that see every single request processed by the entire engine.
  - You wish to run Catalina in with a standalone HTTP connector, but still want support for multiple virtual hosts.
  In general, you would not use an Engine when deploying Catalina connected to a web server (such as Apache), because the Connector will have utilized the web server's facilities to determine which Context (or perhaps even which Wrapper) should be utilized to process this request.

  The child containers attached to an Engine are generally implementations of Host (representing a virtual host) or Context (representing individual an individual servlet context), depending upon the Engine implementation.

  If used, an Engine is always the top level Container in a Catalina hierarchy. Therefore, the implementation's `setParent()` method should throw `IllegalArgumentException`.

  Author:
    Craig R. McClanahan

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from interface org.apache.catalina.Lifecycle

      `Lifecycle.SingleUse`

  - ### Field Summary

    - ### Fields inherited from interface org.apache.catalina.Container

      `ADD_CHILD_EVENT, ADD_VALVE_EVENT, REMOVE_CHILD_EVENT, REMOVE_VALVE_EVENT`

    - ### Fields inherited from interface org.apache.catalina.Lifecycle

      `AFTER_DESTROY_EVENT, AFTER_INIT_EVENT, AFTER_START_EVENT, AFTER_STOP_EVENT, BEFORE_DESTROY_EVENT, BEFORE_INIT_EVENT, BEFORE_START_EVENT, BEFORE_STOP_EVENT, CONFIGURE_START_EVENT, CONFIGURE_STOP_EVENT, PERIODIC_EVENT, START_EVENT, STOP_EVENT`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `String` | `getDefaultHost()`
    `String` | `getJvmRoute()`
    `Service` | `getService()`
    `void` | `setDefaultHost(String defaultHost)` Set the default hostname for this Engine.
    `void` | `setJvmRoute(String jvmRouteId)` Set the JvmRouteId for this engine.
    `void` | `setService(Service service)` Set the `Service` with which we are associated (if any).

    - ### Methods inherited from interface org.apache.catalina.Container

      `addChild, addContainerListener, addPropertyChangeListener, backgroundProcess, findChild, findChildren, findContainerListeners, fireContainerEvent, getAccessLog, getBackgroundProcessorDelay, getCatalinaBase, getCatalinaHome, getCluster, getDomain, getLogger, getLogName, getMBeanKeyProperties, getName, getObjectName, getParent, getParentClassLoader, getPipeline, getRealm, getStartStopThreads, logAccess, removeChild, removeContainerListener, removePropertyChangeListener, setBackgroundProcessorDelay, setCluster, setName, setParent, setParentClassLoader, setRealm, setStartStopThreads`

    - ### Methods inherited from interface org.apache.catalina.Lifecycle

      `addLifecycleListener, destroy, findLifecycleListeners, getState, getStateName, init, removeLifecycleListener, start, stop`

- - ### Method Detail

    - #### getDefaultHost

          String getDefaultHost()

      Returns:
        the default host name for this Engine.

    - #### setDefaultHost

          void setDefaultHost(String defaultHost)

      Set the default hostname for this Engine.
      Parameters:
        `defaultHost` - The new default host

    - #### getJvmRoute

          String getJvmRoute()

      Returns:
        the JvmRouteId for this engine.

    - #### setJvmRoute

          void setJvmRoute(String jvmRouteId)

      Set the JvmRouteId for this engine.
      Parameters:
        `jvmRouteId` - the (new) JVM Route ID. Each Engine within a cluster must have a unique JVM Route ID.

    - #### getService

          Service getService()

      Returns:
        the `Service` with which we are associated (if any).

    - #### setService

          void setService(Service service)

      Set the `Service` with which we are associated (if any).
      Parameters:
        `service` - The service that owns this Engine

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