Introduction

The Data Call Graph scope offers a view based on the individual Data Call Graphs that exist in the current Application. A "call graph" is a view showing "Entry Points to End Points/Data Entities".

Data Call Graphs option will be deactivated if there are no call graphs.
For any call graph, you cannot hide a grouped node.

Click to enlarge

CAST Imaging > User Guide - Data Call Graph scope > call_graph_example.jpg

Accessing the Data Call Graph scope

To access the Data Call Graph scope, click the Data call graph entry in the Investigation panel:

CAST Imaging > User Guide - Data Call Graph scope > call_grap_select.jpg

Choose a specific Data call graph to display. Data call graphs are listed in alphabetical order in the Search for Data call graphs dropdown - by default the first in the list is displayed in the view. The number in square brackets indicates the number of Data call graphs that are available. If there are none, the option will be deactivated.

CAST Imaging > User Guide - Data Call Graph scope > call_grap_select2.jpg

Filtering the list of available data call graphs

Sometimes the list of data call graphs is very large and it can therefore be difficult to locate the item you need. If this is the case, you can use the filter option to reduce the list:

CAST Imaging > User Guide - Data Call Graph scope > trans_filter.jpg

Perspective selection

By default, the perspective (how the data is displayed) will be set to CAST Taxonomy (the default layout configured by CAST Imaging and the only layout available) and Level 4 - you can find out more about the Perspective options in User Guide - GUI - Investigate panel.

Navigation flow

Levels

Levels 4, 5 and Objects are available for selection when CAST Taxonomy aggregation is selected in the Investigate panel - these levels provide ever greater details about the items within the selected layer:

Actions

Action	Location	Result/Behavior
Double click on node	Level 4	In version ≥ 2.12, double clicking a node will transition to level 5.
	Level 5	Drill down to Vignette mode i.e.: Objects level + drill mode Children + Caller/Callee + Group by communities (depending on the object selected). See also User Guide - GUI - Investigate panel for more information on Drill and Communities modes. Click to expand
	Vignette mode	Expand and investigate the selected object to show its sub-objects. Note that when all sub-objects of the selected object are displayed, a message is shown to explain this:
	Objects	View source code of the object. See User Guide - Viewing source code.
Right click on node	Level 4	Properties > Displays information about the node in the right hand slide in panel (see User Guide - Properties panel): If the object properties cannot be retrieved in a timely manner, a retry button will be displayed:
	Level 5	Children + X > Drill down into Vignette mode for further investigation. See also User Guide - GUI - Investigate panel for more information on Drill and Communities modes. Add edge > See User Guide - Working with custom links. Search > Invokes the standard search options for the selected object. See User Guide - Search for items. Properties > Displays information about the node in the right hand slide in panel (see User Guide - Properties panel): If the object properties cannot be retrieved in a timely manner, a retry button will be displayed:
	Objects and Vignette mode	Add callers/callees > Retrieves all caller/called objects. Links are added to the selected object and to any other objects present where a link exists. The number in square brackets in the contextual menu indicates the number of items available. Add linked objects > See User Guide - Using the Add Linked Objects feature for more information. Path finder > See User Guide - Using the Path Finder feature. Call hierarchy > See User Guide - Using the Call Hierarchy feature. Focus > See User Guide - Using the Focus option. Add 2 levels of Callers/Callees > Same principal as the Add Callers/Callees options, but instead displays two levels of objects. Associate to custom aggregation > See User Guide - Creating a custom aggregation mode. Show source code > See See User Guide - Viewing source code. Highlight Callees/Highlight Callers/Highlight Path > See User Guide - Using the Highlight options Hide node/object > Use this to hide selected nodes. To unhide, either use the "Undo" option or refresh the page. It is not possible to hide a concept node or a group node, in which case the option will not be available. Remove object > Use this option to remove the object from the current view. When you reload the view the object will be re-displayed. Annotations/Documents > See User Guide - Using the Annotate feature Properties > Displays information about the object in the right hand slide in panel (see User Guide - Properties panel): If the object properties cannot be retrieved in a timely manner, a retry button will be displayed:
Single click on edge	Levels 4 and 5	N/A
Single click on edge	Objects and Vignette mode	Displays all the methods that are linked between classes and provides additional actions such as: view source code method information add caller/callees See User Guide - Using the Method view for more information.
Double click on edge	Levels 4 and 5, Objects and Vignette	N/A

Call graph start and end points (input/output)

Call graph start (input) and end (output) points are highlighted in the view at Objects level using red circles around the items if they exist:

Legend

CAST Imaging > User Guide - Data Call Graph scope > start_end.jpg

Click the Input or Output items in the right hand legend to highlight the items:

Click to enlarge

CAST Imaging > User Guide - Data Call Graph scope > start_end1.jpg

Shortest path

A related feature available at Object level is known as the Shortest Path feature and is controlled by the option in the left panel - it is disabled by default:

CAST Imaging > User Guide - Data Call Graph scope > critical_path_enabled.jpg

This option highlights the shortest path between the entry point and end point nodes, where multiple entry point and end point nodes are present in the view:

Shortest Path disabled	Shortest Path enabled
Click to enlarge

Note that if no shortest path exists, a message is displayed in the bottom right corner:

Huge Data Call Graph, content is filtered

You may see the following message when looking through the list of available transactions:

CAST Imaging > User Guide - Data Call Graph scope > huge_call.jpg

This indicates that during the data export/import process, the tool identified that the transaction contained more than 10,000 objects, and therefore stopped the processing action for this specific data call graph. In other words, the detail of this data call graph has not been exported and is therefore unavailable.

It is possible to modify the threshold (default 10,000 objects) at which the CAST Imaging exporter tool will consider that a data call graph is "huge" - see Configuring huge transaction or data call graph threshold.