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java sdk for qcloud cos
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/*
 * Copyright 2010-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file 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.
 
 * According to cos feature, we modify some class，comment, field name, etc.
 */


package com.qcloud.cos.transfer;

import com.qcloud.cos.exception.CosClientException;
import com.qcloud.cos.exception.CosServiceException;
import com.qcloud.cos.exception.PauseException;
import com.qcloud.cos.model.UploadResult;

/**
 * Represents an asynchronous upload to Qcloud COS.
 * 
 * See {@link TransferManager} for more information about creating transfers.
 * 
 *
 * @see TransferManager#upload(String, String, java.io.File)
 * @see TransferManager#upload(com.qcloud.cos.model.PutObjectRequest)
 */
public interface Upload extends Transfer {

    /**
     * Waits for this upload to complete and returns the result of this upload. This is a blocking
     * call. Be prepared to handle errors when calling this method. Any errors that occurred during
     * the asynchronous transfer will be re-thrown through this method.
     *
     * @return The result of this transfer.
     *
     * @throws CosClientException If any errors were encountered in the client while making the
     *         request or handling the response.
     * @throws CosServiceException If any errors occurred in Qcloud COS while processing the
     *         request.
     * @throws InterruptedException If this thread is interrupted while waiting for the upload to
     *         complete.
     */
    public UploadResult waitForUploadResult()
            throws CosClientException, CosServiceException, InterruptedException;

    /**
     * Pause the current upload operation and returns the information that can be used to resume the
     * upload.
     *
     * Upload cannot be paused in the following cases.
     * 
     * The data source is an input stream.
     * Client side encryption is used.
     * Server Side Encryption with customer provided key is used.
     * Size of the file being uploaded is less than the
     * {@link TransferManagerConfiguration#getMultipartUploadThreshold()}.
     * 
     * In such cases, aborts the uploads and a PauseFailure exception is thrown
     *
     * @return An opaque token that holds some private state and can be used to resume a paused
     *         download operation.
     *
     * @throws PauseException If failed to pause the operation.
     */
    public PersistableUpload pause() throws PauseException;

    /**
     * Tries to pause the current upload operation and returns the information that can be used to
     * resume the upload.
     *
     * Upload cannot be paused in the following cases.
     * 
     * The data source is an input stream.
     * Client side encryption is used.
     * Server Side Encryption with customer provided key is used.
     * Size of the file being uploaded is less than the
     * {@link TransferManagerConfiguration#getMultipartUploadThreshold()}.
     * 
     *
     * In such cases, aborts the uploads if forceCancelTransfers is set else No action is taken.
     *
     * @param forceCancelTransfers a boolean to forcefully abort the existing uploads if pause
     *        cannot be done.
     *
     * @return a result of pause operation.
     */
    public PauseResult tryPause(boolean forceCancelTransfers);

    /**
     * Abort the current upload operation.
     */
    public void abort();

    /**
     * if multipart upload failed, whether we can upload again. if true, you can call
     * getResumeableMultipartUploadId to get upload info. then can resume to upload again..
     */
    public boolean isResumeableMultipartUploadAfterFailed();

    /**
     * if isResumeableMultipartUploadAfterFailed is true, we can call getResumeableMultipartUploadId
     * to get upload info. then can resume to upload again..
     * 
     * @return the PersistableUpload info if you can upload again, otherwise return null;
     */
    public PersistableUpload getResumeableMultipartUploadId();

}