GVIteratorOperationNode

Description

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

GreenVulcano^® ESB Configuration

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
type	fixed	This attribute must assume the value flow-node.
class	fixed	This attribute must assume the value it.greenvulcano.gvesb.core.flow.GVIteratorOperationNode.
id	required	ID of the node. Unique within the 'Flow'.
op-type	required	Indicates the type of operation that GreenVulcano® ESB must execute: call: GreenVulcano® ESB must perform an invocation. enqueue: GreenVulcano® ESB must perform a send a message. corecall: GreenVulcano® ESB must execute an internal service call.
input	required	Specifies the input (from the execution environment) for the operation. If the input is an exception, the operation is not performed, and the output is set equal input exception.
output	optional	The operation's output (GVBuffer or Exception) is inserted into the execution environment with this exact name. Default to "input" value.
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 concatenated with the previous iteration's output. Default is true.
next-node-id	required	Indicates the next node in the workflow to execute when the operation ends.
point-x	optional	X position of the node in the VulCon® workflows editor. Immutable, used by VulCon.
point-y	optional	Y position of the node in the VulCon® workflows editor. Immutable, used by VulCon.
dump-in-out	optional	If true enable the dump of the input/output GVBuffer. Default false.
dump-env-in-out	optional	If true enable the dump of the input/output Execution Environment. Default false.

Might have the following subelements:

• Description
• CoreCall
• proxy-call or proxy-enqueue
• 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	required	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 false.

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 subelements are:

• Description
• ServiceAlias

exit-loop-condition

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

Might contain the following subelements:

• 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'.