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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.function.Function;
/** A debug server interface, called from core skylark code. */
public interface DebugServer {
/**
* Executes the given callable and returns its result, while making any skylark evaluation visible
* to the debugger. This method should be used to evaluate all debuggable Skylark code.
*
* @param env the Skylark execution environment
* @param threadName the descriptive name of the thread
* @param callable the callable object whose execution will be tracked
* @param <T> the result type of the callable
* @return the value returned by the callable
*/
<T> T runWithDebugging(Environment env, String threadName, DebugCallable<T> callable)
throws EvalException, InterruptedException;
/**
* Shuts down the debug server, closing any open sockets, etc. This can be safely called multiple
* times.
*/
void close();
/**
* Returns a custom {@link Eval} supplier used to intercept statement execution to check for
* breakpoints.
*/
Function<Environment, Eval> evalOverride();
/** Represents an invocation that will be tracked as a thread by the Skylark debug server. */
interface DebugCallable<T> {
/**
* The invocation that will be tracked.
*
* @return the result
*/
T call() throws EvalException, InterruptedException;
}
}
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