GVIteratorOperationNode

Description

Node that can perform a sequence of invocations to the operations of the VCL or other workflows.

VulCon / GV Console Configuration

The GVIteratorOperationNode is a Flow element that extends FlowNode.

The iterations are made on the elements of a collection built by a CollectionDataProvider configured through the attribute 'collection-DP'. Collection elements are inserted in the GVBuffer object to pass to the plug-in with which loop through invocations.

You can configure a condition of premature exit from the loop.

By default, even if a particular iteration throws an exception all the iterations will be executed anyway.

The following table shows the GVIteratorOperationNode element's attributes:

Attribute	Type	Description
class	fixed	This attribute must assume the value it.greenvulcano.gvesb.core.flow.GVIteratorOperationNode.
op-type	required	Indicates the type of operation that GreenVulcano® ESB must execute: call: perform an VCL invocation. enqueue: perform a send a message. corecall: execute an service call. subcall: execute an subflow call.
collection-dp	optional	Name of Data Provider to use. Must return a collection of objects. The attribute's value can't be null.
accumulate-output	optional	If true, output of each iteration is to an array containing the previous iteration's output. Default is true.

Might have the following subelements:

• CoreCall
• proxy-call or proxy-enqueue
• SubFlowCall
• exit-loop-condition
• InputServices
• OutputServices

CoreCall

Defines the parameters to invoke a GreenVulcano^® ESB service. Dynamic fields can contains placeholders.

The following table shows the CoreCall element's attributes:

Attribute	Type	Description
dynamic	optional	If 'true' then id-system, id-service and operation attributes can contains metadata to be resolved at runtime. Default false.
id-service	required	Name of Service to call.
id-system	optional	Name of service's client.
operation	required	Operation to invoke on the service. Corresponds to a GreenVulcano® ESB communication operation or to a forward.
ref-dp	optional	Name of Data Provider to use for modifying the GVBuffer content at each iteration.
change-log-context	optional	If true change the log context fields according to the new System/Service/Operation values. Default true.

proxy-call

Operation useful as a proxy to other Call operation.

The following table shows the proxy-call element's attributes:

Attribute	Type	Description
type	fixed	This attribute must assume the value call.
class	fixed	This attribute must assume the value it.greenvulcano.gvesb.virtual.internal.ProxyCallOperation.
name	required	Operation name. Used in the 'Flow' section to associate workflow nodes to VCL operations.
id-system	required	System providing the Call operation to call.
id-channel	required	System's channel.
operation	required	Channel's Call operation.

Its subelements are:

• Description
• ServiceAlias

proxy-enqueue

Operation useful as a proxy to other Enqueue operation.

The following table shows the proxy-enqueue element's attributes:

Attribute	Type	Description
type	fixed	This attribute must assume the value enqueue.
class	fixed	This attribute must assume the value it.greenvulcano.gvesb.virtual.internal.ProxyEnqueueOperation.
name	required	Operation name. Used in the 'Flow' section to associate workflow nodes to VCL operations.
id-system	required	System providing the Call operation to call.
id-channel	required	System's channel.
operation	required	Channel's Enqueue operation.

Its sub-elements are:

• Description
• ServiceAlias

SubFlowCall

This element defines the parameters to invoke a GreenVulcano^® ESB Operation's SubFlow.

Dynamic fields can contains the placeholders that will be replaced at runtime.

The following table shows the SubFlowCall element's attributes:

Attribute	Type	Description
dynamic	optional	If true then SubFlow attribute might contain placeholders to be resolved at runtime. The default is 'false'.
subflow	required	Name of SubFlow to call.
ref-dp	optional	Name of Data provider to use for modifying the GVBuffer content at each iteration.
change-log-context	optional	If true change the log context fields according to the new Operation(SubFlow) value. Default true.

exit-loop-condition

Defines a condition that occur during an iteration, causing the interruption of the loop calls.

Might contain the following sub-elements:

• Description
• exception-event

exception-event

Defines the type of exception that, if launched at an iteration, causes the interruption of the loop calls.

The following table shows the exception-event element's attributes:

Attribute	Type	Description
value	optional	The type of exception. If the execution of a call sequence throws an exception of this type (or its subtype), the loop stops. The attribute's default value is: java.lang.Exception.
rethrow	optional	Through this attribute you can specify whether the exception that it stopped the loop iterations must be propagated (causing the total failure of the call to GVIteratorOperationNode plug-in) or be retained. The default value is 'true'.