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/*
 * 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.runtime.state.gemini.engine.fs;

import org.apache.flink.runtime.state.gemini.engine.GRegion;
import org.apache.flink.runtime.state.gemini.engine.page.PageAddress;

import org.apache.flink.shaded.guava18.com.google.common.base.MoreObjects;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * PersistenceProxy dynamic to persist DFS or Local based on page size.
 * For example, if page is very huge, then avoiding to evict more space, flush the page to local directly.
 */
public class PersistenceProxy implements PersistenceStrategy {

	private final List persistenceModule;

	public PersistenceProxy() {
		persistenceModule = new ArrayList<>();
	}

	void add(PersistenceStrategy persistenceStrategy) {
		persistenceModule.add(persistenceStrategy);
	}

	@Override
	public void persistPage(GRegion gRegion, PageAddress pageAddress, int compactedMemSize) {
		for (PersistenceStrategy persistenceStrategy : persistenceModule) {
			persistenceStrategy.persistPage(gRegion, pageAddress, compactedMemSize);
		}
	}

	@Override
	public void close() throws IOException {

	}

	@Override
	public String toString() {
		return MoreObjects.toStringHelper(this).
			add("persistenceModule", persistenceModule).toString();
	}
}




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