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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.query2;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.concurrent.ThreadSafety;
import com.google.devtools.build.lib.packages.Attribute;
import com.google.devtools.build.lib.packages.NoSuchThingException;
import com.google.devtools.build.lib.packages.Rule;
import com.google.devtools.build.lib.packages.Target;
import com.google.devtools.build.lib.pkgcache.TargetEdgeObserver;
/**
* Record errors, such as missing package/target or rules containing errors,
* encountered during visitation. Emit an error message upon encountering
* missing edges
*
* The accessor {@link #hasErrors}) may not be called until the concurrent phase
* is over, i.e. all external calls to visit() methods have completed.
*
* If you need to report errors to the console during visitation, use the
* subclass {@link com.google.devtools.build.lib.query2.ErrorPrintingTargetEdgeErrorObserver}.
*/
class TargetEdgeErrorObserver implements TargetEdgeObserver {
/**
* True iff errors were encountered. Note, may be set to "true" during the
* concurrent phase. Volatile, because it is assigned by worker threads and
* read by the main thread without monitor synchronization.
*/
private volatile boolean hasErrors = false;
/**
* Reports an unresolved label error and records the fact that an error was
* encountered.
* @param target the target that referenced the unresolved label
* @param label the label that could not be resolved
* @param e the exception that was thrown when the label could not be resolved
*/
@ThreadSafety.ThreadSafe
@Override
public void missingEdge(Target target, Label label, NoSuchThingException e) {
hasErrors = true;
}
/**
* Returns true iff any errors (such as missing targets or packages, or rules
* with errors) have been encountered during any work.
*
* <p>Not thread-safe; do not call during visitation.
*
* @return true iff no errors (such as missing targets or packages, or rules
* with errors) have been encountered during any work.
*/
public boolean hasErrors() {
return hasErrors;
}
@Override
public void edge(Target from, Attribute attribute, Target to) {
// No-op.
}
@Override
public void node(Target node) {
if (node.getPackage().containsErrors() ||
((node instanceof Rule) && ((Rule) node).containsErrors())) {
this.hasErrors = true; // Note, this is thread-safe.
}
}
}
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