com.qcloud.cos.transfer.CopyPartRequestFactory Maven / Gradle / Ivy
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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.model.CopyObjectRequest;
import com.qcloud.cos.model.CopyPartRequest;
/**
* Factory for creating all the individual CopyPartRequest objects for a multipart copy.
*
* This allows us to delay creating each CopyPartRequest until we're ready for it, instead of
* immediately creating thousands of CopyPartRequest objects for each large copy, when we won't need
* most of those request objects for a while.
*/
public class CopyPartRequestFactory {
/** Upload id to be used in each copy part request. */
private final String uploadId;
/** Optimal size of each part in the copy request. */
private final long optimalPartSize;
/** The original copy object request. */
private final CopyObjectRequest origReq;
/** Part Number to be specified in each copy part request. */
private int partNumber = 1;
/** Starting byte for each part. */
private long offset = 0;
/** The number of remaining bytes to be copied. */
private long remainingBytes;
public CopyPartRequestFactory(CopyObjectRequest origReq, String uploadId, long optimalPartSize,
long contentLength) {
this.origReq = origReq;
this.uploadId = uploadId;
this.optimalPartSize = optimalPartSize;
this.remainingBytes = contentLength;
}
public synchronized boolean hasMoreRequests() {
return (remainingBytes > 0);
}
/**
* Constructs a copy part requests and returns it.
*
* @return Returns a new copy part request
*/
public synchronized CopyPartRequest getNextCopyPartRequest() {
final long partSize = Math.min(optimalPartSize, remainingBytes);
CopyPartRequest req = new CopyPartRequest().withSourceAppid(origReq.getSourceAppid())
.withSourceBucketRegion(origReq.getSourceBucketRegion())
.withSourceEndpointBuilder(origReq.getSourceEndpointBuilder())
.withSourceBucketName(origReq.getSourceBucketName())
.withSourceKey(origReq.getSourceKey()).withUploadId(uploadId)
.withPartNumber(partNumber++)
.withDestinationBucketName(origReq.getDestinationBucketName())
.withDestinationKey(origReq.getDestinationKey())
.withSourceVersionId(origReq.getSourceVersionId())
.withFirstByte(Long.valueOf(offset))
.withLastByte(Long.valueOf(offset + partSize - 1))
// other meta data
.withMatchingETagConstraints(origReq.getMatchingETagConstraints())
.withModifiedSinceConstraint(origReq.getModifiedSinceConstraint())
.withNonmatchingETagConstraints(origReq.getNonmatchingETagConstraints())
.withSourceVersionId(origReq.getSourceVersionId())
.withUnmodifiedSinceConstraint(origReq.getUnmodifiedSinceConstraint())
// general meta data
.withGeneralProgressListener(origReq.getGeneralProgressListener());
TransferManagerUtils.populateEndpointAddr(origReq, req);
offset += partSize;
remainingBytes -= partSize;
return req;
}
}