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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.blob;

import org.apache.flink.api.common.JobID;

import java.io.File;
import java.io.IOException;

/**
 * View on blobs stored in a {@link BlobStore}.
 */
public interface BlobView {

	/**
	 * Copies a blob to a local file.
	 *
	 * @param jobId     ID of the job this blob belongs to (or null if job-unrelated)
	 * @param blobKey   The blob ID
	 * @param localFile The local file to copy to
	 *
	 * @return whether the file was copied (true) or not (false)
	 * @throws IOException If the copy fails
	 */
	boolean get(JobID jobId, BlobKey blobKey, File localFile) throws IOException;
}