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// Copyright 2014 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.pkgcache;
import com.google.common.annotations.VisibleForTesting;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.concurrent.Uninterruptibles;
import com.google.devtools.build.lib.events.EventHandler;
import com.google.devtools.build.lib.packages.NoSuchPackageException;
import com.google.devtools.build.lib.packages.NoSuchTargetException;
import com.google.devtools.build.lib.packages.Target;
import java.util.concurrent.Callable;
/**
* Read-only API for retrieving packages, i.e., calling this API should not result in packages being
* loaded.
*
* <p><b>Concurrency</b>: Implementations should be thread-safe.
*/
// TODO(bazel-team): Skyframe doesn't really implement this - can we remove it?
public interface LoadedPackageProvider {
/**
* Returns a target if it was recently loaded, i.e., since the most recent cache sync. This
* throws an exception if the target was not loaded or not validated, even if it exists in the
* surrounding package. If the surrounding package is in error, still attempts to retrieve the
* target.
*/
Target getLoadedTarget(Label label) throws NoSuchPackageException, NoSuchTargetException;
/**
* A bridge class that implements the legacy semantics of {@link #getLoadedTarget} using a
* normal {@link PackageProvider} instance.
*/
public static final class Bridge implements LoadedPackageProvider {
private final PackageProvider packageProvider;
private final EventHandler eventHandler;
public Bridge(PackageProvider packageProvider, EventHandler eventHandler) {
this.packageProvider = packageProvider;
this.eventHandler = eventHandler;
}
@Override
public Target getLoadedTarget(Label label)
throws NoSuchPackageException, NoSuchTargetException {
return getLoadedTarget(packageProvider, eventHandler, label);
}
/**
* Uninterruptible method to convert a label into a target using a given package provider and
* event handler.
*/
@VisibleForTesting
public static Target getLoadedTarget(
final PackageProvider packageProvider, final EventHandler eventHandler, final Label label)
throws NoSuchPackageException, NoSuchTargetException {
try {
return Uninterruptibles.callUninterruptibly(new Callable<Target>() {
@Override
public Target call()
throws NoSuchPackageException, NoSuchTargetException, InterruptedException {
return packageProvider.getTarget(eventHandler, label);
}
});
} catch (NoSuchPackageException | NoSuchTargetException e) {
throw e;
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
}
}
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