com.qcloud.cos.internal.crypto.MultipartUploadCryptoContext 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.internal.crypto;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import com.qcloud.cos.annotation.GuardedBy;
import com.qcloud.cos.exception.CosClientException;
/**
* Contextual information for an in-flight multipart upload.
*/
public class MultipartUploadCryptoContext {
private final String bucketName;
private final String key;
private boolean hasFinalPartBeenSeen;
/**
* the materialDescription is an optional attribute that is only non-null when the material
* description is set on a per request basis
*/
private Map materialsDescription;
private final ContentCryptoMaterial cekMaterial;
/**
* Can be used to enforce serial uploads.
*/
@GuardedBy("this")
private int partNumber;
/**
* True if a multi-part upload is currently in progress; false otherwise.
*/
private volatile boolean partUploadInProgress;
protected MultipartUploadCryptoContext(String bucketName, String key,
ContentCryptoMaterial cekMaterial) {
this.bucketName = bucketName;
this.key = key;
this.cekMaterial = cekMaterial;
}
public final String getBucketName() {
return bucketName;
}
public final String getKey() {
return key;
}
public final boolean hasFinalPartBeenSeen() {
return hasFinalPartBeenSeen;
}
public final void setHasFinalPartBeenSeen(boolean hasFinalPartBeenSeen) {
this.hasFinalPartBeenSeen = hasFinalPartBeenSeen;
}
/**
* @return the materialsDescription
*/
public final Map getMaterialsDescription() {
return materialsDescription;
}
/**
* @param materialsDescription the materialsDescription to set
*/
public final void setMaterialsDescription(Map materialsDescription) {
this.materialsDescription = materialsDescription == null ? null
: Collections.unmodifiableMap(new HashMap(materialsDescription));
}
/**
* Convenient method to return the content encrypting cipher lite (which is stateful) for the
* multi-part uploads.
*/
CipherLite getCipherLite() {
return cekMaterial.getCipherLite();
}
/**
* Returns the content encrypting cryptographic material for the multi-part uploads.
*/
ContentCryptoMaterial getContentCryptoMaterial() {
return cekMaterial;
}
/**
* Can be used to check the next part number must either be the same (if it was an retry) or
* increment by exactly 1 during a serial part uploads.
*
* As a side effect, the {@link #partUploadInProgress} will be set to true upon successful
* completion of this method. Caller of this method is responsible to call
* {@link #endPartUpload()} in a finally block once the respective part-upload is completed
* (either normally or abruptly).
*
* @see #endPartUpload()
*
* @throws SdkClientException if parallel part upload is detected
*/
void beginPartUpload(final int nextPartNumber) throws CosClientException {
if (nextPartNumber < 1)
throw new IllegalArgumentException("part number must be at least 1");
if (partUploadInProgress) {
throw new CosClientException("Parts are required to be uploaded in series");
}
synchronized (this) {
if (partUploadInProgress) {
throw new CosClientException("Parts are required to be uploaded in series");
}
if (nextPartNumber - partNumber <= 1) {
partNumber = nextPartNumber;
partUploadInProgress = true;
} else {
throw new CosClientException(
"Parts are required to be uploaded in series (partNumber=" + partNumber
+ ", nextPartNumber=" + nextPartNumber + ")");
}
}
}
/**
* Used to mark the completion of a part upload before the next. Should be invoked in a finally
* block, and must be preceded previously by a call to {@link #beginPartUpload(int)}.
*
* @see #beginPartUpload(int)
*/
void endPartUpload() {
partUploadInProgress = false;
}
}