flink-runtime/src/test/java/org/apache/flink/runtime/state/testutils/TestCheckpointStreamFactory.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.runtime.state.testutils;

import org.apache.flink.runtime.state.CheckpointStreamFactory;
import org.apache.flink.runtime.state.CheckpointedStateScope;

import java.util.function.Supplier;

import static org.apache.flink.util.Preconditions.checkNotNull;

/**
 * A bridge between factory lambdas (like {@link Supplier} and the
 * CheckpointStreamFactory class.
 */
public class TestCheckpointStreamFactory implements CheckpointStreamFactory {

	private final Supplier<CheckpointStateOutputStream> supplier;

	public TestCheckpointStreamFactory(Supplier<CheckpointStateOutputStream> supplier) {
		this.supplier = checkNotNull(supplier);
	}

	@Override
	public CheckpointStateOutputStream createCheckpointStateOutputStream(CheckpointedStateScope scope) {
		return supplier.get();
	}
}