| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.nemo.compiler.optimizer; |
| |
| import org.apache.nemo.common.ir.IRDAG; |
| import org.apache.nemo.compiler.optimizer.pass.runtime.Message; |
| import org.apache.reef.tang.annotations.DefaultImplementation; |
| |
| /** |
| * An interface for optimizer, which manages the optimization over submitted IR DAGs through |
| * {@link org.apache.nemo.compiler.optimizer.policy.Policy}s. |
| */ |
| @DefaultImplementation(NemoOptimizer.class) |
| public interface Optimizer { |
| |
| /** |
| * Optimize the submitted DAG at compile time. |
| * |
| * @param dag the input DAG to optimize. |
| * @return optimized DAG, reshaped or tagged with execution properties. |
| */ |
| IRDAG optimizeAtCompileTime(IRDAG dag); |
| |
| /** |
| * Optimize the submitted DAG at run time. |
| * |
| * @param dag input. |
| * @param message for optimization. |
| * @return optimized DAG. |
| */ |
| IRDAG optimizeAtRunTime(IRDAG dag, Message message); |
| } |