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Java Persistent Worker Example

This example shows the NativeLink-facing part of a Java compile action that can run through the remote persistent worker path. The action must declare that the tool supports Bazel's worker protocol and that it uses the proto wire format.

def _javac_worker_impl(ctx):
    args = ctx.actions.args()
    args.add("@%s" % ctx.outputs.argfile.path)

    ctx.actions.run(
        executable = ctx.executable.javac_worker,
        arguments = [args],
        inputs = ctx.files.srcs + [ctx.outputs.argfile],
        outputs = [ctx.outputs.jar],
        mnemonic = "Javac",
        execution_requirements = {
            "supports-workers": "1",
            "requires-worker-protocol": "proto",
        },
    )

NativeLink computes the WorkerKey from the executable, startup flags before the first @argfile, and requires-worker-protocol. The first action starts javac_worker --persistent_worker; later compatible actions send WorkRequest messages to the same process.