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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;

import java.io.IOException;

/**
 * The CompletedCheckpointStorageLocation describes the storage aspect of a completed checkpoint. It
 * can be used to obtain access to the metadata, get a reference pointer to the checkpoint, or to
 * dispose the storage location.
 */
public interface CompletedCheckpointStorageLocation extends java.io.Serializable {

    /**
     * Gets the external pointer to the checkpoint. The pointer can be used to resume a program from
     * the savepoint or checkpoint, and is typically passed as a command line argument, an HTTP
     * request parameter, or stored in a system like ZooKeeper.
     */
    String getExternalPointer();

    /** Gets the state handle to the checkpoint's metadata. */
    StreamStateHandle getMetadataHandle();

    /**
     * Disposes the storage location. This method should be called after all state objects have been
     * released. It typically disposes the base structure of the checkpoint storage, like the
     * checkpoint directory.
     */
    void disposeStorageLocation() throws IOException;
}