RFR: 7831: Add new view for hierarchical edge bundling

[Marcus Hirt]

On Tue, 28 Jun 2022 13:18:45 GMT, Brice Dutheil <duke at openjdk.org> wrote:

> Joint effort with @cimi to provide _hierarchical edge_ visualization to JMC.
> 
> ![Hierarchical Edge view](https://user-images.githubusercontent.com/803621/176186654-04f458f5-6f7d-4755-822c-f63e53ccfc31.png)
> 
> Here when the mouse hovers `java.util.concurrent` on the bottom right. One can see the relations with other packages.
> 
> 
> Based on the preliminary work of @cimi here : https://observablehq.com/@cimi/jfr-graph-hierarchical-edge-bundling

@cimi is adding alternative visualization for chord dependency diagrams towards the end of this week, and then we'll take the changes for 8.3.0.

application/org.openjdk.jmc.feature.flightrecorder/feature.xml line 203:

> 201: 
> 202:    <plugin
> 203:          id="org.openjdk.jmc.flightrecorder.hierarchical-edge"

Nit: I'd prefer to skip the dash.

application/org.openjdk.jmc.feature.flightrecorder/feature.xml line 203:

> 201: 
> 202:    <plugin
> 203:          id="org.openjdk.jmc.flightrecorder.hierarchical-edge"

Nit: I'd prefer skipping the dash.

application/org.openjdk.jmc.flightrecorder.hierarchical-edge/src/main/resources/hierarchical-edge.js line 1:

> 1: function updateGraph(eventsJson) {

First part here is indented with tabs. The rest with spaces. JMC uses 1-tab, 1-level-indent. (Yup, I know that we may be failing this in other parts of our JS code.)

application/org.openjdk.jmc.flightrecorder.hierarchical-edge/src/main/resources/hierarchical-edge.js line 2:

> 1: function updateGraph(eventsJson) {
> 2: 	const data = JSON.parse(eventsJson);

First part here is indented with tabs. The rest with spaces. JMC uses 1-tab, 1-level-indent. (Yup, I know that we may be failing this in other parts of our JS code.)

-------------

PR: https://git.openjdk.org/jmc/pull/405