org.eclipse.smila.taskmanager.httphandler

Class WorkerTaskHandler

java.lang.Object

org.eclipse.smila.http.server.util.ARequestHandler

org.eclipse.smila.http.server.json.JsonRequestHandler

org.eclipse.smila.taskmanager.httphandler.WorkerTaskHandler

All Implemented Interfaces:

HttpHandler, RequestHandler

public class WorkerTaskHandler
extends JsonRequestHandler

Implements the handling of HTTP requests of a worker to obtain a task. URL pattern: taskmanager/-workername-/

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	KEY_QUALIFIER the qualifier key.
static java.lang.String	KEY_WORKERHOST key of workerHost property.

Fields inherited from class org.eclipse.smila.http.server.json.JsonRequestHandler

FACTORY, HEADER_REQUEST_HOST, HTTP_UTILS

Constructor Summary

Constructors

Constructor and Description
WorkerTaskHandler()

Method Summary

Methods

Modifier and Type	Method and Description
protected int	getErrorStatus(java.lang.String method, java.lang.String requestUri, java.lang.Throwable ex) Adds HTTP result code 400 ("BAD_REQUEST") for IllegalArgumentException to the exception handling of JsonRequestHandler.getErrorStatus(String, String, Throwable).
protected java.util.Collection<java.lang.String>	getQualifier(Record inputRecord)
protected int	getSuccessStatus(java.lang.String requestMethod, java.lang.String requestUri, Record inputRecord, java.lang.Object resultObject) Returns the success code.
protected boolean	isValidMethod(java.lang.String method, java.lang.String requestUri) Checks if the handler allows the HTTP method.
java.lang.Object	process(java.lang.String method, java.lang.String requestUri, Record inputRecord) process input record and return result object.
void	setTaskManager(TaskManager taskManager)
void	unsetTaskManager(TaskManager taskManager)

Methods inherited from class org.eclipse.smila.http.server.json.JsonRequestHandler

getRequestHost, getSuccessStatus, handle, process, writeErrorResult, writeResultObject, writeSuccessResult

Methods inherited from class org.eclipse.smila.http.server.util.ARequestHandler

activate, getDynamicUriParts, getRootContextPath, getStaticUriParts, getUriPattern, matches, urlDecode

Methods inherited from class java.lang.Object

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

Field Detail

KEY_WORKERHOST

public static final java.lang.String KEY_WORKERHOST

key of workerHost property.

See Also:

Constant Field Values

KEY_QUALIFIER

public static final java.lang.String KEY_QUALIFIER

the qualifier key.

See Also:

Constant Field Values

Constructor Detail

WorkerTaskHandler

public WorkerTaskHandler()

Method Detail

process

public java.lang.Object process(java.lang.String method,
                       java.lang.String requestUri,
                       Record inputRecord)
                         throws java.lang.Exception

process input record and return result object. Override this method in your handler if you do not need access to HttpExchange object, e.g. to read http header fields. Otherwise use overloaded method with HttpExchange parameter.

Overrides:

process in class JsonRequestHandler

Parameters:

method - HTTP method

requestUri - request URI.

inputRecord - input record parsed either from request body, if it has content, or from request URI parameters.

Returns:

result object, may be null. If this is not a Record, you have to provide a JsonRequestHandler.writeResultObject(OutputStream, Object) method, too.

Throws:

java.lang.Exception - any failure during processing.

getQualifier

protected java.util.Collection<java.lang.String> getQualifier(Record inputRecord)

Returns:

task qualifier, if specified in input records.

getErrorStatus

protected int getErrorStatus(java.lang.String method,
                 java.lang.String requestUri,
                 java.lang.Throwable ex)

Adds HTTP result code 400 ("BAD_REQUEST") for IllegalArgumentException to the exception handling of JsonRequestHandler.getErrorStatus(String, String, Throwable).

Overrides:

getErrorStatus in class JsonRequestHandler

Parameters:

method - HTTP method

requestUri - request URI

ex - an exception

Returns:

error status code.

See Also:

HTTP_UTILS#getErrorStatus(String, String, Throwable)

getSuccessStatus

protected int getSuccessStatus(java.lang.String requestMethod,
                   java.lang.String requestUri,
                   Record inputRecord,
                   java.lang.Object resultObject)

Returns the success code.

Overrides:

getSuccessStatus in class JsonRequestHandler

Parameters:

requestMethod - HTTP method

requestUri - request URI

inputRecord - input record

resultObject - result object returned from process

Returns:

the status code to return for successful requests using the method and request URI.

isValidMethod

protected boolean isValidMethod(java.lang.String method,
                    java.lang.String requestUri)

Checks if the handler allows the HTTP method. GET and POST are currently the only valid methods.

Overrides:

isValidMethod in class JsonRequestHandler

Parameters:

method - HTTP method

requestUri - request URI

Returns:

true if the method can be used for the URI, else false.

setTaskManager

public void setTaskManager(TaskManager taskManager)

Parameters:

taskManager - the reference to the JobManager service.

unsetTaskManager

public void unsetTaskManager(TaskManager taskManager)

Parameters:

taskManager - the reference to the current JobManager service.