com.smartgwt.client.util.workflow

## Class Process

- java.lang.Object
- - com.smartgwt.client.core.BaseClass
  - - com.smartgwt.client.util.workflow.Process

- All Implemented Interfaces:
    com.google.gwt.event.shared.HasHandlers, HasFinishedHandlers, HasTraceElementHandlers
  Direct Known Subclasses:
    Tour

      public class Process
      extends BaseClass
      implements HasFinishedHandlers, HasTraceElementHandlers

  A instance of Process represents a stateful process executing a series of Tasks, which may be:
  - user interactions
  - calls to DataSources (hence: any database or web service)
  - arbitrary code
  - other Processes
  A Process is stateful in the sense that it maintains `state` across the different tasks that are executed. This allows you to maintain context as you walk a user through a multi-step business process in your application, which may involve multiple operations on multiple entities. Each Task that executes can use the Process state as inputs, and can output a result which is stored in the Process state - see `TaskIO`.

  A Process can have multiple branches, choosing the next Task to execute based on `Criteria` - see `DecisionTask` and `MultiDecisionTask`.

  Because a Process may return to a previous Task in various situations, the data model of a Process is strictly speaking a graph (a set of nodes connected by arbitary interlinks). However, most processes have sequences of several tasks in a row, and the definition format allows these to be represented as simple Arrays called "sequences", specified via `sequences`. This reduces the need to manually specify IDs and interlinks for Tasks that simply proceed to the next task in a sequence.

  Processes follow all the standard rules for encoding as `ComponentXML`, however, note that the <Process> tag allows any kind of `ProcessElement` (tasks, decisions and sequences) to appear as a direct subelement of the <Process> tag without the need for an intervening <elements> or <sequences> tag. The example below demonstrates this shorthand format.

        <Process ID="processId">
            <ServiceTask ID="serviceTaskId" nextElement="sequenceId" ..>
                <inputFieldList>
                    <value>order.countryName</value>
                </inputFieldList>
                <outputFieldList>
                    <value>order.countryName</value>
                    <value>order.continent</value>
                <outputFieldList>
            </ServiceTask>
            <sequence ID="sequenceId" >
                <StateTask ../>
                <StateTask ../>
                <StateTask ../>
                <StateTask nextElement="userTaskId" ../>
            </sequence>
            <UserTask ID="userTaskId" ../>
            ...
        </Process>

  NOTE: you must load the standard DataBinding module before you can use `Process`.

- - ### Field Summary

    - ### Fields inherited from class com.smartgwt.client.core.BaseClass

      `config, configOnly, factoryCreated, factoryProperties, id, scClassName`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `Process()`
    `Process(com.google.gwt.core.client.JavaScriptObject jsObj)`

  - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `com.google.gwt.event.shared.HandlerRegistration` | `addFinishedHandler(FinishedHandler handler)` Add a finished handler.
    `com.google.gwt.event.shared.HandlerRegistration` | `addTraceElementHandler(TraceElementHandler handler)` Add a traceElement handler.
    `com.google.gwt.core.client.JavaScriptObject` | `create()`
    `java.lang.String[]` | `getComponentReferences()` Returns a list of unique global IDs that are referenced by this process.
    `java.lang.String` | `getContainerId()` Identifier of canvas where UI elements created by using `inline view` property should be added using addMember.
    `java.lang.Integer` | `getDefaultWaitDuration()` When `defaultWaitFor` or task `waitFor` are set to "duration", how long should the wait be before starting the task? A task can override the default value with task `waitDuration`.
    `WaitForType` | `getDefaultWaitFor()` Condition to wait for before each task is executed.
    `ProcessElement` | `getElement(java.lang.String ID)` Retrieve a `ProcessElement` by its ID
    `ProcessElement[]` | `getElements()` Elements involved in this Process.
    `com.google.gwt.core.client.JavaScriptObject` | `getJsObj()`
    `java.lang.Object` | `getLastTaskOutput()` Returns the task output of the last task executed.
    `java.lang.Object` | `getLastTaskOutput(java.lang.String taskType)` Returns the task output of the last task executed.
    `java.lang.Boolean` | `getMockMode()` Enable mock mode on the workflow? By default, this setting does nothing but is available for individual tasks to trigger special action.
    `com.google.gwt.core.client.JavaScriptObject` | `getOrCreateJsObj()`
    `static Process` | `getOrCreateRef(com.google.gwt.core.client.JavaScriptObject jsObj)`
    `static Process` | `getProcess(java.lang.String processId)` Get a Process instance by its ID.
    `java.lang.String` | `getProcessDescription()` Returns the process description as HTML.
    `ProcessElement[]` | `getProcessElements(java.lang.String attribute)`
    `java.lang.String` | `getRuleScope()` `Canvas.ID` of the component that manages "rule context" for which this process participates.
    `ProcessSequence[]` | `getSequences()` Sequences of ProcessElements.
    `java.lang.String` | `getStartElement()` The ID of either a `sequence` or an `element` which should be the starting point of the process.
    `Record` | `getState()` Current state of a process.
    `java.lang.Object` | `getStateVariable(java.lang.String stateVariablePath)` Returns a variable value from the `process state`.
    `java.util.Map` | `getTraceContext()` Context object to be passed to `Process.traceElement()` during process execution.
    `java.lang.Boolean` | `getWizard()` If wizard is set then current workflow will be handled as wizard.
    `boolean` | `isCreated()`
    `static void` | `loadProcess(java.lang.String processId, ProcessCallback callback)`
    `protected void` | `onInit()`
    `void` | `passThruTaskOutput(ProcessElement task)` Takes the `last task output` and sets it as the `task output` for the `task`.
    `void` | `reset()` Reset process to its initial state, so process can be started again.
    `void` | `reset(Record state)` Reset process to its initial state, so process can be started again.
    `Process` | `setAttribute(java.lang.String attribute, ProcessElement[] value, boolean allowPostCreate)`
    `void` | `setConfig(com.google.gwt.core.client.JavaScriptObject jsObj)`
    `Process` | `setContainerId(java.lang.String containerId)` Identifier of canvas where UI elements created by using `inline view` property should be added using addMember.
    `Process` | `setDefaultWaitDuration(java.lang.Integer defaultWaitDuration)` When `defaultWaitFor` or task `waitFor` are set to "duration", how long should the wait be before starting the task? A task can override the default value with task `waitDuration`.
    `Process` | `setDefaultWaitFor(WaitForType defaultWaitFor)` Condition to wait for before each task is executed.
    `Process` | `setElements(ProcessElement... elements)` Elements involved in this Process.
    `void` | `setJavaScriptObject(com.google.gwt.core.client.JavaScriptObject jsObj)`
    `Process` | `setMockMode(java.lang.Boolean mockMode)` Enable mock mode on the workflow? By default, this setting does nothing but is available for individual tasks to trigger special action.
    `void` | `setNextElement()` Sets the task ID of the next task to execute after the current task finishes.
    `void` | `setNextElement(java.lang.String nextElement)` Sets the task ID of the next task to execute after the current task finishes.
    `Process` | `setRuleScope(java.lang.String ruleScope)` `Canvas.ID` of the component that manages "rule context" for which this process participates.
    `Process` | `setSequences(ProcessSequence... sequences)` Sequences of ProcessElements.
    `void` | `setStartElement(ProcessElement startElement)`
    `Process` | `setStartElement(java.lang.String startElement)` The ID of either a `sequence` or an `element` which should be the starting point of the process.
    `Process` | `setState(Record state)` Current state of a process.
    `void` | `setStateVariable(java.lang.String stateVariablePath, java.lang.Object value)` Sets a `process state` variable for later reference with `getStateVariable()` or more commonly with a `TaskInputExpression` property.
    `void` | `setTaskOutput(ProcessElement task, java.lang.Object value)` Sets the task output of `task` in the `process state` so it can be used by later tasks with `getLastTaskOutput()` or more commonly with a `TaskInputExpression` property.
    `Process` | `setTraceContext(java.util.Map traceContext)` Context object to be passed to `Process.traceElement()` during process execution.
    `Process` | `setWizard(java.lang.Boolean wizard)` If wizard is set then current workflow will be handled as wizard.
    `void` | `start()` Starts this task by executing the `startElement`.

    - ### Methods inherited from class com.smartgwt.client.core.BaseClass

      `addDynamicProperty, addDynamicProperty, addDynamicProperty, addDynamicProperty, applyFactoryProperties, asSGWTComponent, clearDynamicProperty, createJsObj, destroy, doAddHandler, doInit, error, error, errorIfNotCreated, fireEvent, getAttribute, getAttributeAsBoolean, getAttributeAsDate, getAttributeAsDouble, getAttributeAsElement, getAttributeAsFloat, getAttributeAsInt, getAttributeAsJavaScriptObject, getAttributeAsMap, getAttributeAsString, getAttributeAsStringArray, getClassName, getConfig, getHandlerCount, getID, getRef, getScClassName, getTestInstance, hasAutoAssignedID, hasDynamicProperty, internalSetID, internalSetID, isConfigOnly, isFactoryCreated, onBind, registerID, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAutoID, setConfigOnly, setFactoryCreated, setID, setProperty, setProperty, setProperty, setProperty, setScClassName`

    - ### Methods inherited from class java.lang.Object

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

    - ### Methods inherited from interface com.google.gwt.event.shared.HasHandlers

      `fireEvent`

- - ### Constructor Detail

    - #### Process

          public Process()

    - #### Process

          public Process(com.google.gwt.core.client.JavaScriptObject jsObj)

  - ### Method Detail

    - #### getOrCreateRef

          public static Process getOrCreateRef(com.google.gwt.core.client.JavaScriptObject jsObj)

    - #### setJavaScriptObject

          public void setJavaScriptObject(com.google.gwt.core.client.JavaScriptObject jsObj)

      Overrides:
        `setJavaScriptObject` in class `BaseClass`

    - #### create

          public com.google.gwt.core.client.JavaScriptObject create()

      Specified by:
        `create` in class `BaseClass`

    - #### isCreated

          public boolean isCreated()

      Overrides:
        `isCreated` in class `BaseClass`

    - #### getJsObj

          public com.google.gwt.core.client.JavaScriptObject getJsObj()

      Overrides:
        `getJsObj` in class `BaseClass`

    - #### getOrCreateJsObj

          public com.google.gwt.core.client.JavaScriptObject getOrCreateJsObj()

      Overrides:
        `getOrCreateJsObj` in class `BaseClass`

    - #### setContainerId

          public Process setContainerId(java.lang.String containerId)

      Identifier of canvas where UI elements created by using `inline view` property should be added using addMember.
      Parameters:
        `containerId` - New containerId value. Default value is null
      Returns:
        `Process` instance, for chaining setter calls
      See Also:
        `GlobalId`

    - #### getContainerId

          public java.lang.String getContainerId()

      Identifier of canvas where UI elements created by using `inline view` property should be added using addMember.
      Returns:
        Current containerId value. Default value is null
      See Also:
        `GlobalId`

    - #### setDefaultWaitDuration

          public Process setDefaultWaitDuration(java.lang.Integer defaultWaitDuration)
                                         throws java.lang.IllegalStateException

      When `defaultWaitFor` or task `waitFor` are set to "duration", how long should the wait be before starting the task? A task can override the default value with task `waitDuration`.
      Parameters:
        `defaultWaitDuration` - New defaultWaitDuration value. Default value is "300"
      Returns:
        `Process` instance, for chaining setter calls
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### getDefaultWaitDuration

          public java.lang.Integer getDefaultWaitDuration()

      When `defaultWaitFor` or task `waitFor` are set to "duration", how long should the wait be before starting the task? A task can override the default value with task `waitDuration`.
      Returns:
        Current defaultWaitDuration value. Default value is "300"

    - #### setDefaultWaitFor

          public Process setDefaultWaitFor(WaitForType defaultWaitFor)
                                    throws java.lang.IllegalStateException

      Condition to wait for before each task is executed. Task `waitFor` can be specified for individual tasks to override this default.

      For a value of "duration", the delay time is set by `defaultWaitDuration` and can be overridden by a task `waitDuration`.

      Note that if `defaultWaitFor` is set to "systemDone" and a task overrides it with `waitFor` "locator", the default "systemDone" is not performed. To apply both, as might be desired, use task `waitFor` "locatorAndSystemDone".

      A `defaultWaitFor` value of "locator" or "locatorAndSystemDone" is not valid.

      Parameters:
        `defaultWaitFor` - New defaultWaitFor value. Default value is null
      Returns:
        `Process` instance, for chaining setter calls
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### getDefaultWaitFor

          public WaitForType getDefaultWaitFor()

      Condition to wait for before each task is executed. Task `waitFor` can be specified for individual tasks to override this default.

      For a value of "duration", the delay time is set by `defaultWaitDuration` and can be overridden by a task `waitDuration`.

      Note that if `defaultWaitFor` is set to "systemDone" and a task overrides it with `waitFor` "locator", the default "systemDone" is not performed. To apply both, as might be desired, use task `waitFor` "locatorAndSystemDone".

      A `defaultWaitFor` value of "locator" or "locatorAndSystemDone" is not valid.

      Returns:
        Current defaultWaitFor value. Default value is null

    - #### setElements

          public Process setElements(ProcessElement... elements)
                              throws java.lang.IllegalStateException

      Elements involved in this Process. You can also group elements into `sequences` to reduce the need to explicitly define IDs for elements and interlink them.
      Parameters:
        `elements` - New elements value. Default value is null
      Returns:
        `Process` instance, for chaining setter calls
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### setMockMode

          public Process setMockMode(java.lang.Boolean mockMode)

      Enable mock mode on the workflow? By default, this setting does nothing but is available for individual tasks to trigger special action. For example, a task that would normally fail outside of its target environment can take an alternative action during testing.

      mockMode can also be enabled or disabled for an individual task with `ProcessElement.mockMode`.

      Parameters:
        `mockMode` - New mockMode value. Default value is null
      Returns:
        `Process` instance, for chaining setter calls

    - #### getMockMode

          public java.lang.Boolean getMockMode()

      Enable mock mode on the workflow? By default, this setting does nothing but is available for individual tasks to trigger special action. For example, a task that would normally fail outside of its target environment can take an alternative action during testing.

      mockMode can also be enabled or disabled for an individual task with `ProcessElement.mockMode`.

      Returns:
        Current mockMode value. Default value is null

    - #### setRuleScope

          public Process setRuleScope(java.lang.String ruleScope)
                               throws java.lang.IllegalStateException

      `Canvas.ID` of the component that manages "rule context" for which this process participates. The rule context can be used in `taskInputExpression`.
      Overrides:
        `setRuleScope` in class `BaseClass`
      Parameters:
        `ruleScope` - New ruleScope value. Default value is null
      Returns:
        `Process` instance, for chaining setter calls
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created
      See Also:
        `Canvas.setRuleScope(java.lang.String)`

    - #### getRuleScope

          public java.lang.String getRuleScope()

      `Canvas.ID` of the component that manages "rule context" for which this process participates. The rule context can be used in `taskInputExpression`.
      Overrides:
        `getRuleScope` in class `BaseClass`
      Returns:
        Current ruleScope value. Default value is null
      See Also:
        `Canvas.getRuleScope()`

    - #### setSequences

          public Process setSequences(ProcessSequence... sequences)
                               throws java.lang.IllegalStateException

      Sequences of ProcessElements. By defining a sequences of elements you can make the `ProcessElement.nextElement` implicit.

      Example of using sequences:

            Process process = new Process();
            process.setStartElement("firstSequence");
            ProcessSequence innerSequence = new ProcessSequence(incTask, add2Task, incTask);
            process.setSequences(
                new ProcessSequence("firstSequence", serviceTask, multiDecisionTask),
                new ProcessSequence("errorFlow", failureTask, userNotifyTask)
            );
            // standalone process elements not part of sequences
            process.setElements(new ServiceTask(){...});
            Record state = new Record();
            state.setAttribute("someField", "someValue");
            process.setState(state);
            process.start();

      Parameters:
        `sequences` - New sequences value. Default value is null
      Returns:
        `Process` instance, for chaining setter calls
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### getSequences

          public ProcessSequence[] getSequences()

      Sequences of ProcessElements. By defining a sequences of elements you can make the `ProcessElement.nextElement` implicit.

      Example of using sequences:

            Process process = new Process();
            process.setStartElement("firstSequence");
            ProcessSequence innerSequence = new ProcessSequence(incTask, add2Task, incTask);
            process.setSequences(
                new ProcessSequence("firstSequence", serviceTask, multiDecisionTask),
                new ProcessSequence("errorFlow", failureTask, userNotifyTask)
            );
            // standalone process elements not part of sequences
            process.setElements(new ServiceTask(){...});
            Record state = new Record();
            state.setAttribute("someField", "someValue");
            process.setState(state);
            process.start();

      Returns:
        Current sequences value. Default value is null

    - #### setStartElement

          public Process setStartElement(java.lang.String startElement)
                                  throws java.lang.IllegalStateException

      The ID of either a `sequence` or an `element` which should be the starting point of the process. If not specified, the first sequence is chosen, or if there are no sequences, the first element. - log a warning and do nothing if there are neither sequences or elements
      Parameters:
        `startElement` - New startElement value. Default value is null
      Returns:
        `Process` instance, for chaining setter calls
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### getStartElement

          public java.lang.String getStartElement()

      The ID of either a `sequence` or an `element` which should be the starting point of the process. If not specified, the first sequence is chosen, or if there are no sequences, the first element. - log a warning and do nothing if there are neither sequences or elements
      Returns:
        Current startElement value. Default value is null

    - #### setState

          public Process setState(Record state)

      Current state of a process. As with Records in general, any field of a Record may contain a nested Record or Array of Records, so the process state is essentially a hierarchical data structure.

      #### Transient state

      In addition to the explicit process state there is a "transient state." The transient state represents the complete output of each of the last tasks of each type within the current process execution. This allows easy reference to the previous task output with `taskInputExpressions`.
      If this method is called after the component has been drawn/initialized: Set process state for current process
      Parameters:
        `state` - the new process state. Default value is null
      Returns:
        `Process` instance, for chaining setter calls

    - #### getState

          public Record getState()

      Current state of a process. As with Records in general, any field of a Record may contain a nested Record or Array of Records, so the process state is essentially a hierarchical data structure.

      #### Transient state

      In addition to the explicit process state there is a "transient state." The transient state represents the complete output of each of the last tasks of each type within the current process execution. This allows easy reference to the previous task output with `taskInputExpressions`.
      Returns:
        Current state value. Default value is null

    - #### setTraceContext

          public Process setTraceContext(java.util.Map traceContext)

      Context object to be passed to `Process.traceElement()` during process execution.

      Note : This is an advanced setting

      Parameters:
        `traceContext` - New traceContext value. Default value is null
      Returns:
        `Process` instance, for chaining setter calls

    - #### getTraceContext

          public java.util.Map getTraceContext()

      Context object to be passed to `Process.traceElement()` during process execution.
      Returns:
        Current traceContext value. Default value is null

    - #### setWizard

          public Process setWizard(java.lang.Boolean wizard)
                            throws java.lang.IllegalStateException

      If wizard is set then current workflow will be handled as wizard. Every userTask will hide associated form after user finished step.
      Parameters:
        `wizard` - New wizard value. Default value is false
      Returns:
        `Process` instance, for chaining setter calls
      Throws:
        `java.lang.IllegalStateException` - this property cannot be changed after the underlying component has been created

    - #### getWizard

          public java.lang.Boolean getWizard()

      If wizard is set then current workflow will be handled as wizard. Every userTask will hide associated form after user finished step.
      Returns:
        Current wizard value. Default value is false

    - #### addFinishedHandler

          public com.google.gwt.event.shared.HandlerRegistration addFinishedHandler(FinishedHandler handler)

      Add a finished handler.

      StringMethod called when a process completes, meaning the process executes a ProcessElement with no next element.

      Specified by:
        `addFinishedHandler` in interface `HasFinishedHandlers`
      Parameters:
        `handler` - the finished handler
      Returns:
        `HandlerRegistration` used to remove this handler

    - #### getComponentReferences

          public java.lang.String[] getComponentReferences()

      Returns a list of unique global IDs that are referenced by this process.

      List is assembled by calling `ProcessElement.getComponentReferences()` for each task in the workflow and filtering the list to the unique component IDs.

      Returns:
        array of component IDs that are referenced by this process

    - #### getElement

          public ProcessElement getElement(java.lang.String ID)

      Retrieve a `ProcessElement` by its ID
      Parameters:
        `ID` - id of the process element
      Returns:
        the indicated process element, or null if no such element exists

    - #### getLastTaskOutput

          public java.lang.Object getLastTaskOutput()

      Returns the task output of the last task executed. More commonly a `TaskInputExpression` property is used (see `ProcessElement.getDynamicValue()`).
      Returns:
        the last task output or null if none is found

    - #### getLastTaskOutput

          public java.lang.Object getLastTaskOutput(java.lang.String taskType)

      Returns the task output of the last task executed. More commonly a `TaskInputExpression` property is used (see `ProcessElement.getDynamicValue()`).
      Parameters:
        `taskType` - the optional task type to lookup in last task output
      Returns:
        the last task output or null if none is found

    - #### getProcessDescription

          public java.lang.String getProcessDescription()

      Returns the process description as HTML.
      Returns:
        the process description as HTML

    - #### getStateVariable

          public java.lang.Object getStateVariable(java.lang.String stateVariablePath)

      Returns a variable value from the `process state`. Values can be written into process state by `setStateVariable()`, setting `ProcessElement.bindOutput`, or various task output settings (See `TaskIO`.)
      Parameters:
        `stateVariablePath` - path to variable in process state to set. segments are separated by a decimal point (.)
      Returns:
        the value found at the path

    - #### passThruTaskOutput

          public void passThruTaskOutput(ProcessElement task)

      Takes the `last task output` and sets it as the `task output` for the `task`.

      This method is not just a shortcut to set output of a pass-thru task but it also records the correct schema of the passed-thru output so it can be quickly looked up.

      Parameters:
        `task` - the workflow task setting the output (i.e. this)

    - #### reset

          public void reset()

      Reset process to its initial state, so process can be started again.

    - #### reset

          public void reset(Record state)

      Reset process to its initial state, so process can be started again.
      Parameters:
        `state` - new state of the process

    - #### setNextElement

          public void setNextElement()

      Sets the task ID of the next task to execute after the current task finishes. If the task is not found or `null` is passed as the nextElement, the current process will be terminated instead.

    - #### setNextElement

          public void setNextElement(java.lang.String nextElement)

      Sets the task ID of the next task to execute after the current task finishes. If the task is not found or `null` is passed as the nextElement, the current process will be terminated instead.
      Parameters:
        `nextElement` - ID of the next task execute or null to terminate process

    - #### setStateVariable

          public void setStateVariable(java.lang.String stateVariablePath,
                                       java.lang.Object value)

      Sets a `process state` variable for later reference with `getStateVariable()` or more commonly with a `TaskInputExpression` property.
      Parameters:
        `stateVariablePath` - path to variable in process state to set. segments are separated by a decimal point (.)
        `value` - the value to save

    - #### setTaskOutput

          public void setTaskOutput(ProcessElement task,
                                    java.lang.Object value)

      Sets the task output of `task` in the `process state` so it can be used by later tasks with `getLastTaskOutput()` or more commonly with a `TaskInputExpression` property.

      If the task sets `bindOutput` the output value is also written into that `process state` variable.

      Parameters:
        `task` - the workflow task setting the output (i.e. this)
        `value` - the output value for task

    - #### start

          public void start()

      Starts this task by executing the `startElement`. Also used by asynchronous tasks to restart the workflow.

    - #### addTraceElementHandler

          public com.google.gwt.event.shared.HandlerRegistration addTraceElementHandler(TraceElementHandler handler)

      Add a traceElement handler.

      StringMethod called during process execution before each task element is processed.

      Specified by:
        `addTraceElementHandler` in interface `HasTraceElementHandlers`
      Parameters:
        `handler` - the traceElement handler
      Returns:
        `HandlerRegistration` used to remove this handler

    - #### getProcess

          public static Process getProcess(java.lang.String processId)

      Get a Process instance by its ID.

      Each process instance created that has an `ID` is cached for later lookup by that ID. If two processes have the same ID the last one is cached, overwriting the first. Note that the process instances are not affected - only the cache reference.

      Parameters:
        `processId` - process ID to retrieve. See `Identifier`
      Returns:
        the process, or null if not found
      See Also:
        `loadProcess(java.lang.String, com.smartgwt.client.callbacks.ProcessCallback)`, `Identifier`

    - #### onInit

          protected void onInit()

      Overrides:
        `onInit` in class `BaseClass`

    - #### setAttribute

          public Process setAttribute(java.lang.String attribute,
                                      ProcessElement[] value,
                                      boolean allowPostCreate)

    - #### setConfig

          public void setConfig(com.google.gwt.core.client.JavaScriptObject jsObj)

      Overrides:
        `setConfig` in class `BaseClass`

    - #### loadProcess

          public static void loadProcess(java.lang.String processId,
                                         ProcessCallback callback)

    - #### getProcessElements

          public ProcessElement[] getProcessElements(java.lang.String attribute)

    - #### getElements

          public ProcessElement[] getElements()

      Elements involved in this Process. You can also group elements into `sequences` to reduce the need to explicitly define IDs for elements and interlink them.
      Returns:
        ProcessElement

    - #### setStartElement

          public void setStartElement(ProcessElement startElement)
                               throws java.lang.IllegalStateException

      Throws:
        `java.lang.IllegalStateException`
      See Also:
        `setStartElement(String)`