com.lightbend.lagom.javadsl.projection

Class ProjectionsImpl

Object

com.lightbend.lagom.javadsl.projection.ProjectionsImpl

All Implemented Interfaces:

Projections

public class ProjectionsImpl
extends Object
implements Projections

INTERNAL API

Constructor Summary

Constructors

Constructor and Description
ProjectionsImpl(com.lightbend.lagom.internal.projection.ProjectionRegistry registry, scala.concurrent.ExecutionContext executionContext)

Method Summary

Modifier and Type	Method and Description
CompletionStage<State>	getStatus() Read an eventually consistent copy of the projections and workers running on the service.
void	startAllWorkers(String projectionName) Given a `projectionName`, request all its workers to start.
void	startWorker(String projectionName, String tagName) Given a `projectionName` and a `tagName` request a single worker to start.
void	stopAllWorkers(String projectionName) Given a `projectionName`, request all its workers to stop.
void	stopWorker(String projectionName, String tagName) Given a `projectionName` and a `tagName` request a single worker to stop.

Methods inherited from class Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ProjectionsImpl

public ProjectionsImpl(com.lightbend.lagom.internal.projection.ProjectionRegistry registry,
                       scala.concurrent.ExecutionContext executionContext)

Method Detail

getStatus

public CompletionStage<State> getStatus()

Description copied from interface: Projections

Read an eventually consistent copy of the projections and workers running on the service. Invocations to this method return a local copy of the `State` so multiple invocations in different nodes of the cluster may return different versions of `State` when it is evolving (e.g. during a rolling upgrade, while attending a user request to stop/start,...)

Specified by:

getStatus in interface Projections

Returns:

an eventually consistent list of projections' metadata

startAllWorkers

public void startAllWorkers(String projectionName)

Description copied from interface: Projections

Given a `projectionName`, request all its workers to start. This method returns immediately. Eventually, the request will propagate across the cluster and, after that, workers participating on that projection will start. To track the actual state of the workers, poll the projection registry using the method `getStatus`.

Specified by:

startAllWorkers in interface Projections

startWorker

public void startWorker(String projectionName,
                        String tagName)

Description copied from interface: Projections

Given a `projectionName` and a `tagName` request a single worker to start. This method returns immediately. Eventually, the request will propagate across the cluster and reach the node where that particular worker must be allocated allocated. Then, the worker will be started, it's status change will be observed and propagated back across the cluster. To track the actual state of the workers, poll the projection registry using the method `getStatus`.

Specified by:

startWorker in interface Projections

stopAllWorkers

public void stopAllWorkers(String projectionName)

Description copied from interface: Projections

Given a `projectionName`, request all its workers to stop. This method returns immediately. Eventually, the request will propagate across the cluster and, after that, workers participating on that projection will stop. To track the actual state of the workers, poll the projection registry using the method `getStatus`.

Specified by:

stopAllWorkers in interface Projections

stopWorker

public void stopWorker(String projectionName,
                       String tagName)

Description copied from interface: Projections

Given a `projectionName` and a `tagName` request a single worker to stop. This method returns immediately. Eventually, the request will propagate across the cluster and reach the node where that particular worker is currently allocated. Then, the worker will be stopped, it's status change will be observed and propagated back across the cluster. To track the actual state of the workers, poll the projection registry using the method `getStatus`.

Specified by:

stopWorker in interface Projections