| // Copyright 2015 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.engine; |
| |
| import com.google.devtools.build.lib.concurrent.ThreadSafety.ThreadSafe; |
| import com.google.devtools.build.lib.util.BatchCallback; |
| import com.google.devtools.build.lib.util.ThreadSafeBatchCallback; |
| |
| /** |
| * Query callback to be called by a {@link QueryExpression} when it has part of the computation |
| * result. Assuming the {@code QueryEnvironment} supports it, it would allow the caller |
| * to stream the results. |
| */ |
| @ThreadSafe |
| public interface Callback<T> extends ThreadSafeBatchCallback<T, QueryException> { |
| |
| /** |
| * According to the {@link BatchCallback} interface, repeated elements may be passed in here. |
| * However, {@code QueryExpression}s calling the callback do not need to maintain this property, |
| * as the {@code QueryEnvironment} should filter out duplicates. |
| */ |
| @Override |
| void process(Iterable<T> partialResult) throws QueryException, InterruptedException; |
| } |