// Copyright 2016 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.common.base.Predicate;
/**
* The environment of a Blaze query which supports predefined streaming operations.
*
* @param <T> the node type of the dependency graph
*/
public interface StreamableQueryEnvironment<T> extends QueryEnvironment<T> {
/** Retrieve and process all reverse dependencies of given expression in a streaming manner. */
QueryTaskFuture<Void> getAllRdeps(
QueryExpression expression,
Predicate<T> universe,
VariableContext<T> context,
Callback<T> callback,
int depth);
/**
* Similar to {@link #getAllRdeps} but finds all rdeps without a depth bound, making use of the
* provided {@code forkJoinPool}.
*/
QueryTaskFuture<Void> getAllRdepsUnboundedParallel(
QueryExpression expression,
VariableContext<T> context,
Callback<T> callback);
}