PlanCacheCleaner.java

/*
 * 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.flink.optimizer.dag;

import org.apache.flink.util.Visitor;

final class PlanCacheCleaner implements Visitor<OptimizerNode> {
	
	static final PlanCacheCleaner INSTANCE = new PlanCacheCleaner();

	@Override
	public boolean preVisit(OptimizerNode visitable) {
		if (visitable.cachedPlans != null && visitable.isOnDynamicPath()) {
			visitable.cachedPlans = null;
			return true;
		} else {
			return false;
		}
	}

	@Override
	public void postVisit(OptimizerNode visitable) {}
}