Performing search operation are blocked until the build is done in vscode

[gayanper]

When opening a workspace, the project build is started. When the project is large it takes time to complete the build which is same in Eclipse as well. But in vscode the search operations such as reference and call hierarchy are blocked until the build is finished. In eclipse this works fine. As I remember a search operation is only blocked for indexing operations. It would be nice to support the same behavior as in Eclipse IDE from the LS as well so editors like VSCode can simulate the same behavior like Eclipse IDE.

[snjeza]

When opening a workspace, the project build is started.

@gayanper it would happen only when starting your workspace the first time.
Could you provide a project sample?

[gayanper]

Unfortunately the project is proprietary. But will try with for example jdt.core and see if i experience the same and get back

[testforstephen]

This should be related with the timing of registering these capabilities. At the moment we delay the registration until the build job has finished. It makes sense to enable earlier if some features don't conflict with build job.

https://github.com/eclipse/eclipse.jdt.ls/blob/2130d70af2c39cbf7c6da825f89580456361608a/org.eclipse.jdt.ls.core/src/org/eclipse/jdt/ls/core/internal/handlers/JDTLanguageServer.java#L270-L283

[rgrunber]

Is this really the case ? I just tried re-importing eclipse.jdt.ls into a fresh Eclipse workspace, and a call hierarchy search still seemed to block until the build was completed.

For what it's worth, with #2341, the time it takes for the index to load could be improved quite a bit. With that said, I agree that we should look into registering capabilities sooner if it allows users to take advantage of more functionality sooner.