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/**
* Encapsulates the request or response payload information between the ContainerPlacementHandler service and external
* controllers issuing placement actions
*/
@InterfaceStability.Evolving
public abstract class ContainerPlacementMessage {

public enum StatusCode {
 /**
  * Indicates that the container placement action is created
  */
 CREATED,

 /**
  * Indicates that the container placement action was rejected because request was deemed invalid
  */
 BAD_REQUEST,

 /**
  * Indicates that the container placement action is accepted and waiting to be processed
  */
 ACCEPTED,

 /**
  * Indicates that the container placement action is in progress
  */
 IN_PROGRESS,

 /**
  * Indicates that the container placement action is in progress
  */
 SUCCEEDED,

 /**
  * Indicates that the container placement action is in failed
  */
 FAILED;
}

/**
* UUID attached to a message which helps in identifying duplicate request messages written to metastore and not
* retake actions even if metastore is eventually consistent
*/
protected final UUID uuid;
/**
* Unique identifier for a deployment so messages can be invalidated across a job restarts
* for ex yarn bases cluster manager should set this to app attempt id
*/
protected final String deploymentId;
// Logical container Id 0, 1, 2
protected final String processorId;
// Destination host where container is desired to be moved
protected final String destinationHost;
// Optional request expiry which acts as a timeout for any resource request to cluster resource manager
protected final Duration requestExpiry;
// Status of the current request
protected final StatusCode statusCode;
// Timestamp of the request or response message
protected final long timestamp;

protected ContainerPlacementMessage(UUID uuid, String deploymentId, String processorId, String destinationHost,
   Duration requestExpiry, StatusCode statusCode, long timestamp) {…}

}