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// Copyright 2018 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.devtools.build.lib.syntax;
import java.util.concurrent.atomic.AtomicReference;
/**
* A helper class for enabling/disabling skylark debugging.
*
* <p>{@code runWithDebuggingIfEnabled} must be called after {@code initializeDebugServer}, and
* before {@code disableDebugging}.
*/
public final class DebugServerUtils {
private DebugServerUtils() {}
private static final AtomicReference<DebugServer> instance = new AtomicReference<>();
/**
* Called at the start of a debuggable skylark session to enable debugging. The custom {@link
* Eval} supplier provided should intercept statement execution to check for breakpoints.
*/
public static void initializeDebugServer(DebugServer server) {
instance.set(server);
Eval.setEvalSupplier(server.evalOverride());
}
/**
* Called at the end of a debuggable skylark session to shut down the debug server and disable
* debugging.
*/
public static void disableDebugging() {
DebugServer server = instance.getAndSet(null);
if (server != null) {
server.close();
}
Eval.removeCustomEval();
}
}
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