gr.uoa.di.madgik.execution.engine

Class ExecutionEngine

java.lang.Object

gr.uoa.di.madgik.execution.engine.ExecutionEngine

public class ExecutionEngine
extends Object

This class acts as a singleton instance of an ExecutionEngine through which plans are submitted, executed and managed.

Author:

gpapanikos

Field Summary

Fields

Modifier and Type	Field and Description
static String	LOADTOPICNAME Execution engine load notification topic
static String	PRODUCERID Execution engine topic producer ID

Method Summary

Methods

Modifier and Type	Method and Description
static void	Execute(ExecutionHandle Handle) Start the execution of the plan that is described by the provided ExecutionHandle
static EngineStatus	GetEngineStatus() Retrieves the status if the engine in this node
static String	getLocalhost()
static void	Init(ExecutionEngineConfig Config) Initializes the single instance of the engine
protected static boolean	isInitialized() Checks if execution engine is initialized
protected static void	RemoveExecutor(PlanExecutor executor) Removes the executor.
static ExecutionHandle	Submit(ExecutionPlan plan) Submit an execution plan to retrieve an ExecutionHandle

Methods inherited from class java.lang.Object

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

Field Detail

PRODUCERID

public static final String PRODUCERID

Execution engine topic producer ID

See Also:

Constant Field Values

LOADTOPICNAME

public static final String LOADTOPICNAME

Execution engine load notification topic

See Also:

Constant Field Values

Method Detail

getLocalhost

public static String getLocalhost()

Init

public static void Init(ExecutionEngineConfig Config)

Initializes the single instance of the engine

Parameters:

Config - the config

Submit

public static ExecutionHandle Submit(ExecutionPlan plan)
                              throws ExecutionEngineFullException,
                                     ExecutionValidationException,
                                     ExecutionInternalErrorException

Submit an execution plan to retrieve an ExecutionHandle

Parameters:

plan - the plan

Returns:

the execution handle

Throws:

ExecutionEngineFullException - the execution engine full

ExecutionValidationException - A validation error occurred

ExecutionInternalErrorException - An internal error occurred

Execute

public static void Execute(ExecutionHandle Handle)
                    throws ExecutionInternalErrorException

Start the execution of the plan that is described by the provided ExecutionHandle

Parameters:

Handle - the handle

Throws:

ExecutionInternalErrorException - An internal error occurred

GetEngineStatus

public static EngineStatus GetEngineStatus()
                                    throws ExecutionInternalErrorException

Retrieves the status if the engine in this node

Returns:

the engine status

Throws:

ExecutionInternalErrorException - An internal error occurred

RemoveExecutor

protected static void RemoveExecutor(PlanExecutor executor)

Removes the executor.

Parameters:

executor - the executor

isInitialized

protected static boolean isInitialized()
                                throws ExecutionInternalErrorException

Checks if execution engine is initialized

Returns:

true if execution engine is initialized, otherwise false

Throws:

ExecutionInternalErrorException