| // 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.query; |
| |
| 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 |
| * |
| * <p>The accessor {@link #hasErrors}) may not be called until the concurrent phase is over, i.e. |
| * all external calls to visit() methods have completed. |
| * |
| * <p>If you need to report errors to the console during visitation, use the subclass {@link |
| * 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. |
| } |
| } |
| } |