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/**
* Copyright Microsoft Corporation
*
* Licensed 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 com.microsoft.azure.storage.blob;
import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URI;
import java.net.URISyntaxException;
import javax.crypto.Cipher;
import com.microsoft.azure.storage.AccessCondition;
import com.microsoft.azure.storage.Constants;
import com.microsoft.azure.storage.DoesServiceRequest;
import com.microsoft.azure.storage.OperationContext;
import com.microsoft.azure.storage.StorageCredentials;
import com.microsoft.azure.storage.StorageException;
import com.microsoft.azure.storage.StorageUri;
import com.microsoft.azure.storage.core.ExecutionEngine;
import com.microsoft.azure.storage.core.SR;
import com.microsoft.azure.storage.core.StorageRequest;
import com.microsoft.azure.storage.core.StreamMd5AndLength;
import com.microsoft.azure.storage.core.Utility;
/**
* Represents a Microsoft Azure Append Blob.
*/
public final class CloudAppendBlob extends CloudBlob {
/**
* Creates an instance of the CloudAppendBlob class using the specified absolute URI and storage service
* client.
*
* @param blobAbsoluteUri
* A java.net.URI object which represents the absolute URI to the blob.
*
* @throws StorageException
* If a storage service error occurred.
*/
public CloudAppendBlob(final URI blobAbsoluteUri) throws StorageException {
this(new StorageUri(blobAbsoluteUri));
}
/**
* Creates an instance of the CloudAppendBlob class using the specified absolute URI and storage service
* client.
*
* @param blobAbsoluteUri
* A {@link StorageUri} object which represents the absolute URI to the blob.
*
* @throws StorageException
* If a storage service error occurred.
*/
public CloudAppendBlob(final StorageUri blobAbsoluteUri) throws StorageException {
this(blobAbsoluteUri, (StorageCredentials)null);
}
/**
* Creates an instance of the CloudAppendBlob class by copying values from another append blob.
*
* @param otherBlob
* A CloudAppendBlob object which represents the append blob to copy.
*/
public CloudAppendBlob(final CloudAppendBlob otherBlob) {
super(otherBlob);
}
/**
* Creates an instance of the CloudAppendBlob class using the specified absolute URI and credentials.
*
* @param blobAbsoluteUri
* A java.net.URI object that represents the absolute URI to the blob.
* @param credentials
* A {@link StorageCredentials} object used to authenticate access.
*
* @throws StorageException
* If a storage service error occurred.
*/
public CloudAppendBlob(final URI blobAbsoluteUri, final StorageCredentials credentials) throws StorageException {
this(new StorageUri(blobAbsoluteUri), credentials);
}
/**
* Creates an instance of the CloudAppendBlob class using the specified absolute URI, snapshot ID, and
* credentials.
*
* @param blobAbsoluteUri
* A java.net.URI object that represents the absolute URI to the blob.
* @param snapshotID
* A String that represents the snapshot version, if applicable.
* @param credentials
* A {@link StorageCredentials} object used to authenticate access.
* @throws StorageException
* If a storage service error occurred.
*/
public CloudAppendBlob(final URI blobAbsoluteUri, final String snapshotID, final StorageCredentials credentials)
throws StorageException {
this(new StorageUri(blobAbsoluteUri), snapshotID, credentials);
}
/**
* Creates an instance of the CloudAppendBlob class using the specified absolute StorageUri
* and credentials.
*
* @param blobAbsoluteUri
* A {@link StorageUri} object that represents the absolute URI to the blob.
* @param credentials
* A {@link StorageCredentials} object used to authenticate access.
*
* @throws StorageException
* If a storage service error occurred.
*/
public CloudAppendBlob(final StorageUri blobAbsoluteUri, final StorageCredentials credentials) throws StorageException {
this(blobAbsoluteUri, null /* snapshotID */, credentials);
}
/**
* Creates an instance of the CloudAppendBlob class using the specified absolute StorageUri, snapshot
* ID, and credentials.
*
* @param blobAbsoluteUri
* A {@link StorageUri} object that represents the absolute URI to the blob.
* @param snapshotID
* A String that represents the snapshot version, if applicable.
* @param credentials
* A {@link StorageCredentials} object used to authenticate access.
* @throws StorageException
* If a storage service error occurred.
*/
public CloudAppendBlob(final StorageUri blobAbsoluteUri, final String snapshotID, final StorageCredentials credentials)
throws StorageException {
super(BlobType.APPEND_BLOB, blobAbsoluteUri, snapshotID, credentials);
}
/**
* Creates an instance of the CloudAppendBlob class using the specified type, name, snapshot ID, and
* container.
*
* @param blobName
* Name of the blob.
* @param snapshotID
* A String that represents the snapshot version, if applicable.
* @param container
* The reference to the parent container.
* @throws URISyntaxException
* If the resource URI is invalid.
*/
protected CloudAppendBlob(String blobName, String snapshotID, CloudBlobContainer container)
throws URISyntaxException {
super(BlobType.APPEND_BLOB, blobName, snapshotID, container);
}
/**
* Requests the service to start copying a append blob's contents, properties, and metadata to a new append blob.
*
* @param sourceBlob
* A CloudAppendBlob object that represents the source blob to copy.
*
* @return A String which represents the copy ID associated with the copy operation.
*
* @throws StorageException
* If a storage service error occurred.
* @throws URISyntaxException
*/
@DoesServiceRequest
public final String startCopy(final CloudAppendBlob sourceBlob) throws StorageException, URISyntaxException {
return this.startCopy(sourceBlob, null /* sourceAccessCondition */,
null /* destinationAccessCondition */, null /* options */, null /* opContext */);
}
/**
* Requests the service to start copying a append blob's contents, properties, and metadata to a new append blob,
* using the specified access conditions, lease ID, request options, and operation context.
*
* @param sourceBlob
* A CloudAppendBlob object that represents the source blob to copy.
* @param sourceAccessCondition
* An {@link AccessCondition} object that represents the access conditions for the source blob.
* @param destinationAccessCondition
* An {@link AccessCondition} object that represents the access conditions for the destination blob.
* @param options
* A {@link BlobRequestOptions} object that specifies any additional options for the request. Specifying
* null will use the default request options from the associated service client (
* {@link CloudBlobClient}).
* @param opContext
* An {@link OperationContext} object that represents the context for the current operation. This object
* is used to track requests to the storage service, and to provide additional runtime information about
* the operation.
*
* @return A String which represents the copy ID associated with the copy operation.
*
* @throws StorageException
* If a storage service error occurred.
* @throws URISyntaxException
*
*/
@DoesServiceRequest
public final String startCopy(final CloudAppendBlob sourceBlob, final AccessCondition sourceAccessCondition,
final AccessCondition destinationAccessCondition, BlobRequestOptions options, OperationContext opContext)
throws StorageException, URISyntaxException {
Utility.assertNotNull("sourceBlob", sourceBlob);
URI source = sourceBlob.getSnapshotQualifiedUri();
if (sourceBlob.getServiceClient() != null && sourceBlob.getServiceClient().getCredentials() != null)
{
source = sourceBlob.getServiceClient().getCredentials().transformUri(sourceBlob.getSnapshotQualifiedUri());
}
return this.startCopy(source, sourceAccessCondition, destinationAccessCondition, options, opContext);
}
/**
* Creates an empty append blob. If the blob already exists, this will replace it.
*
* To avoid overwriting and instead throw an error, please use the
* {@link #createOrReplace(AccessCondition, BlobRequestOptions, OperationContext)} overload with the appropriate
* {@link AccessCondition}.
*
* @throws StorageException
* If a storage service error occurred.
*/
@DoesServiceRequest
public void createOrReplace() throws StorageException {
this.createOrReplace(null /* accessCondition */, null /* options */, null /* opContext */);
}
/**
* Creates an append blob using the specified request options and operation context. If the blob already exists,
* this will replace it.
*
* To avoid overwriting and instead throw an error, please pass in an {@link AccessCondition} generated using
* {@link AccessCondition#generateIfNotExistsCondition()}.
*
* @param accessCondition
* An {@link AccessCondition} object which represents the access conditions for the blob.
* @param options
* A {@link BlobRequestOptions} object that specifies any additional options for the request. Specifying
* null will use the default request options from the associated service client (
* {@link CloudBlobClient}).
* @param opContext
* An {@link OperationContext} object which represents the context for the current operation. This object
* is used to track requests to the storage service, and to provide additional runtime information about
* the operation.
*
* @throws StorageException
* If a storage service error occurred.
*/
@DoesServiceRequest
public void createOrReplace(final AccessCondition accessCondition, BlobRequestOptions options,
OperationContext opContext) throws StorageException {
assertNoWriteOperationForSnapshot();
if (opContext == null) {
opContext = new OperationContext();
}
options = BlobRequestOptions.populateAndApplyDefaults(options, BlobType.APPEND_BLOB, this.blobServiceClient);
ExecutionEngine.executeWithRetry(this.blobServiceClient, this,
this.createImpl(accessCondition, options), options.getRetryPolicyFactory(), opContext);
}
private StorageRequest createImpl(final AccessCondition accessCondition,
final BlobRequestOptions options) {
final StorageRequest putRequest = new StorageRequest(
options, this.getStorageUri()) {
@Override
public HttpURLConnection buildRequest(CloudBlobClient client, CloudBlob blob, OperationContext context)
throws Exception {
return BlobRequest.putBlob(blob.getTransformedAddress(context).getUri(this.getCurrentLocation()),
options, context, accessCondition, blob.properties, BlobType.APPEND_BLOB, 0);
}
@Override
public void setHeaders(HttpURLConnection connection, CloudBlob blob, OperationContext context) {
BlobRequest.addMetadata(connection, blob.metadata, context);
}
@Override
public void signRequest(HttpURLConnection connection, CloudBlobClient client, OperationContext context)
throws Exception {
StorageRequest.signBlobQueueAndFileRequest(connection, client, 0L, context);
}
@Override
public Void preProcessResponse(CloudBlob blob, CloudBlobClient client, OperationContext context)
throws Exception {
if (this.getResult().getStatusCode() != HttpURLConnection.HTTP_CREATED) {
this.setNonExceptionedRetryableFailure(true);
return null;
}
blob.updateEtagAndLastModifiedFromResponse(this.getConnection());
this.getResult().setRequestServiceEncrypted(CloudBlob.isServerRequestEncrypted(this.getConnection()));
blob.getProperties().setLength(0);
return null;
}
};
return putRequest;
}
/**
* Commits a new block of data to the end of the blob.
*
* @param sourceStream
* An {@link InputStream} object that represents the input stream to write to the append blob.
* @param length
* A long which represents the length, in bytes, of the stream data, or -1 if unknown.
*
* @return The offset at which the block was appended.
* @throws IOException
* If an I/O exception occurred.
* @throws StorageException
* If a storage service error occurred.
*/
@DoesServiceRequest
public Long appendBlock(final InputStream sourceStream, final long length) throws IOException, StorageException
{
return this.appendBlock(sourceStream, length, null, null, null);
}
/**
* Commits a new block of data to the end of the blob.
*
* @param sourceStream
* An {@link InputStream} object that represents the input stream to write to the Append blob.
* @param length
* A long which represents the length, in bytes, of the stream data, or -1 if unknown.
* @param accessCondition
* An {@link AccessCondition} object which represents the access conditions for the blob.
* @param options
* A {@link BlobRequestOptions} object that specifies any additional options for the request. Specifying
* null will use the default request options from the associated service client (
* {@link CloudBlobClient}).
* @param opContext
* An {@link OperationContext} object which represents the context for the current operation. This object
* is used to track requests to the storage service, and to provide additional runtime information about
* the operation.
* @return The offset at which the block was appended.
* @throws IOException
* If an I/O exception occurred.
* @throws StorageException
* If a storage service error occurred.
*/
@DoesServiceRequest
public Long appendBlock(final InputStream sourceStream, final long length, final AccessCondition accessCondition,
BlobRequestOptions options, OperationContext opContext) throws StorageException, IOException
{
if (length < -1) {
throw new IllegalArgumentException(SR.STREAM_LENGTH_NEGATIVE);
}
assertNoWriteOperationForSnapshot();
if (opContext == null) {
opContext = new OperationContext();
}
options = BlobRequestOptions.populateAndApplyDefaults(options, BlobType.APPEND_BLOB, this.blobServiceClient);
// Assert no encryption policy as this is not supported for partial uploads
options.assertNoEncryptionPolicyOrStrictMode();
if (sourceStream.markSupported()) {
// Mark sourceStream for current position.
sourceStream.mark(Constants.MAX_MARK_LENGTH);
}
InputStream bufferedStreamReference = sourceStream;
StreamMd5AndLength descriptor = new StreamMd5AndLength();
descriptor.setLength(length);
if (!sourceStream.markSupported()) {
// needs buffering
final ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
descriptor = Utility.writeToOutputStream(sourceStream, byteStream, length, false /* rewindSourceStream */,
options.getUseTransactionalContentMD5(), opContext, options);
bufferedStreamReference = new ByteArrayInputStream(byteStream.toByteArray());
}
else if (length < 0 || options.getUseTransactionalContentMD5()) {
// If the stream is of unknown length or we need to calculate the
// MD5, then we we need to read the stream contents first
descriptor = Utility.analyzeStream(sourceStream, length, -1L, true /* rewindSourceStream */,
options.getUseTransactionalContentMD5());
}
if (descriptor.getLength() > 4 * Constants.MB) {
throw new IllegalArgumentException(SR.STREAM_LENGTH_GREATER_THAN_4MB);
}
StorageRequest appendBlockImpl = appendBlockImpl(descriptor.getMd5(), bufferedStreamReference,
descriptor.getLength(), accessCondition, options, opContext);
return ExecutionEngine.executeWithRetry(this.blobServiceClient, this, appendBlockImpl, options.getRetryPolicyFactory(), opContext);
}
private StorageRequest appendBlockImpl(final String md5,
final InputStream sourceStream, final long length, final AccessCondition accessCondition,
final BlobRequestOptions options, final OperationContext opContext) {
final StorageRequest putRequest = new StorageRequest(
options, this.getStorageUri()) {
@Override
public HttpURLConnection buildRequest(CloudBlobClient client, CloudAppendBlob blob, OperationContext context)
throws Exception {
this.setSendStream(sourceStream);
this.setLength(length);
return BlobRequest.appendBlock(blob.getTransformedAddress(opContext).getUri(this.getCurrentLocation()),
options, opContext, accessCondition);
}
@Override
public void setHeaders(HttpURLConnection connection, CloudAppendBlob blob, OperationContext context) {
if (options.getUseTransactionalContentMD5()) {
connection.setRequestProperty(Constants.HeaderConstants.CONTENT_MD5, md5);
}
}
@Override
public void signRequest(HttpURLConnection connection, CloudBlobClient client, OperationContext context)
throws Exception {
StorageRequest.signBlobQueueAndFileRequest(connection, client, length, context);
}
@Override
public Long preProcessResponse(CloudAppendBlob blob, CloudBlobClient client, OperationContext context)
throws Exception {
if (this.getResult().getStatusCode() != HttpURLConnection.HTTP_CREATED) {
this.setNonExceptionedRetryableFailure(true);
return null;
}
Long appendOffset = null;
if (this.getConnection().getHeaderField(Constants.HeaderConstants.BLOB_APPEND_OFFSET) != null)
{
appendOffset = Long.parseLong(this.getConnection().getHeaderField(Constants.HeaderConstants.BLOB_APPEND_OFFSET));
}
blob.updateEtagAndLastModifiedFromResponse(this.getConnection());
blob.updateCommittedBlockCountFromResponse(this.getConnection());
this.getResult().setRequestServiceEncrypted(CloudBlob.isServerRequestEncrypted(this.getConnection()));
return appendOffset;
}
@Override
public void recoveryAction(OperationContext context) throws IOException {
sourceStream.reset();
sourceStream.mark(Constants.MAX_MARK_LENGTH);
}
};
return putRequest;
}
/**
* Updates the blob's committed block count from the web request.
*
* @param request
* The web request from which to parse the committed block count.
*/
private void updateCommittedBlockCountFromResponse(HttpURLConnection request) {
final String comittedBlockCount = request.getHeaderField(Constants.HeaderConstants.BLOB_COMMITTED_BLOCK_COUNT);
if (!Utility.isNullOrEmpty(comittedBlockCount))
{
this.getProperties().setAppendBlobCommittedBlockCount(Integer.parseInt(comittedBlockCount));
}
}
/**
* Appends a stream to an append blob. This API should be used strictly in a single writer scenario because the API
* internally uses the append-offset conditional header to avoid duplicate blocks which does not work in a multiple
* writer scenario.
*
* If you are doing writes in a single writer scenario, please look at
* {@link BlobRequestOptions#setAbsorbConditionalErrorsOnRetry(Boolean)} and see if setting this flag
* to true is acceptable for you.
*
* @param sourceStream
* A {@link InputStream} object providing the blob content to append.
* @param length
* A long which represents the length, in bytes, of the stream data, or -1 if unknown.
* @throws StorageException
* If a storage service error occurred.
* @throws IOException
* If an I/O exception occurred.
*/
@DoesServiceRequest
public void append(InputStream sourceStream, final long length) throws StorageException, IOException
{
this.append(sourceStream, length, null /* accessCondition */, null /* options */, null /* operationContext */);
}
/**
* Appends a stream to an append blob. This API should be used strictly in a single writer scenario because the API
* internally uses the append-offset conditional header to avoid duplicate blocks which does not work in a multiple
* writer scenario.
*
* If you are doing writes in a single writer scenario, please look at
* {@link BlobRequestOptions#setAbsorbConditionalErrorsOnRetry(Boolean)} and see if setting this flag
* to true is acceptable for you.
*
* @param sourceStream
* A {@link InputStream} object providing the blob content to append.
* @param length
* A long which represents the length, in bytes, of the stream data, or -1 if unknown.
* @param accessCondition
* An {@link AccessCondition} object which represents the access conditions for the blob.
* @param options
* A {@link BlobRequestOptions} object that specifies any additional options for the request. Specifying
* null will use the default request options from the associated service client (
* {@link CloudBlobClient}).
* @param opContext
* An {@link OperationContext} object which represents the context for the current operation. This object
* is used to track requests to the storage service, and to provide additional runtime information about
* the operation.
* @throws StorageException
* If a storage service error occurred.
* @throws IOException
* If an I/O exception occurred.
*/
@DoesServiceRequest
public void append(InputStream sourceStream, final long length, AccessCondition accessCondition,
BlobRequestOptions options, OperationContext opContext) throws StorageException, IOException
{
assertNoWriteOperationForSnapshot();
if (opContext == null) {
opContext = new OperationContext();
}
options = BlobRequestOptions.populateAndApplyDefaults(options, BlobType.APPEND_BLOB, this.blobServiceClient);
if (sourceStream.markSupported()) {
// Mark sourceStream for current position.
sourceStream.mark(Constants.MAX_MARK_LENGTH);
}
final BlobOutputStream streamRef = this.openWriteExisting(accessCondition, options, opContext);
try {
streamRef.write(sourceStream, length);
}
finally {
streamRef.close();
}
}
/**
* Appends the contents of a byte array to an append blob.This API should be used strictly in a single writer
* scenario because the API internally uses the append-offset conditional header to avoid duplicate blocks which
* does not work in a multiple writer scenario.
*
* If you are doing writes in a single writer scenario, please look at
* {@link BlobRequestOptions#setAbsorbConditionalErrorsOnRetry(Boolean)} and see if setting this flag
* to true is acceptable for you.
*
* @param buffer
* A byte array which represents the data to append to the blob.
* @param offset
* A int which represents the offset of the byte array from which to start the data upload.
* @param length
* An int which represents the number of bytes to upload from the input buffer.
*
* @throws StorageException
* If a storage service error occurred.
* @throws IOException
* If an I/O exception occurred.
*/
public void appendFromByteArray(final byte[] buffer, final int offset, final int length) throws StorageException,
IOException {
appendFromByteArray(buffer, offset, length, null /* accessCondition */, null /* options */, null /* opContext */);
}
/**
* Appends the contents of a byte array to an append blob.This API should be used strictly in a single writer
* scenario because the API internally uses the append-offset conditional header to avoid duplicate blocks which
* does not work in a multiple writer scenario.
*
* If you are doing writes in a single writer scenario, please look at
* {@link BlobRequestOptions#setAbsorbConditionalErrorsOnRetry(Boolean)} and see if setting this flag
* to true is acceptable for you.
*
* @param buffer
* A byte array which represents the data to append to the blob.
* @param offset
* A int which represents the offset of the byte array from which to start the data upload.
* @param length
* An int which represents the number of bytes to upload from the input buffer.
* @param accessCondition
* An {@link AccessCondition} object that represents the access conditions for the blob.
* @param options
* A {@link BlobRequestOptions} object that specifies any additional options for the request. Specifying
* null will use the default request options from the associated service client (
* {@link CloudBlobClient}).
* @param opContext
* An {@link OperationContext} object that represents the context for the current operation. This object
* is used to track requests to the storage service, and to provide additional runtime information about
* the operation.
*
* @throws StorageException
* If a storage service error occurred.
* @throws IOException
* If an I/O exception occurred.
*/
public void appendFromByteArray(final byte[] buffer, final int offset, final int length,
final AccessCondition accessCondition, BlobRequestOptions options, OperationContext opContext)
throws StorageException, IOException {
ByteArrayInputStream inputStream = new ByteArrayInputStream(buffer, offset, length);
this.append(inputStream, length, accessCondition, options, opContext);
inputStream.close();
}
/**
* Appends a file to an append blob. This API should be used strictly in a single writer scenario because the API
* internally uses the append-offset conditional header to avoid duplicate blocks which does not work in a multiple
* writer scenario.
*
* If you are doing writes in a single writer scenario, please look at
* {@link BlobRequestOptions#setAbsorbConditionalErrorsOnRetry(Boolean)} and see if setting this flag
* to true is acceptable for you.
*
* @param path
* A String which represents the path to the file to be appended.
*
* @throws StorageException
* If a storage service error occurred.
* @throws IOException
* If an I/O exception occurred.
*/
public void appendFromFile(final String path) throws StorageException, IOException {
appendFromFile(path, null /* accessCondition */, null /* options */, null /* opContext */);
}
/**
* Appends a file to an append blob. This API should be used strictly in a single writer scenario because the API
* internally uses the append-offset conditional header to avoid duplicate blocks which does not work in a multiple
* writer scenario.
*
* If you are doing writes in a single writer scenario, please look at
* {@link BlobRequestOptions#setAbsorbConditionalErrorsOnRetry(Boolean)} and see if setting this flag
* to true is acceptable for you.
*
* @param path
* A String which represents the path to the file to be appended.
* @param accessCondition
* An {@link AccessCondition} object that represents the access conditions for the blob.
* @param options
* A {@link BlobRequestOptions} object that specifies any additional options for the request. Specifying
* null will use the default request options from the associated service client (
* {@link CloudBlobClient}).
* @param opContext
* An {@link OperationContext} object that represents the context for the current operation. This object
* is used to track requests to the storage service, and to provide additional runtime information about
* the operation.
*
* @throws StorageException
* If a storage service error occurred.
* @throws IOException
* If an I/O exception occurred.
*/
public void appendFromFile(final String path, final AccessCondition accessCondition, BlobRequestOptions options,
OperationContext opContext) throws StorageException, IOException {
File file = new File(path);
long fileLength = file.length();
InputStream inputStream = new BufferedInputStream(new FileInputStream(file));
this.append(inputStream, fileLength, accessCondition, options, opContext);
inputStream.close();
}
/**
* Appends a string of text to an append blob using the platform's default encoding. This API should be used
* strictly in a single writer scenario because the API internally uses the append-offset conditional header to
* avoid duplicate blocks which does not work in a multiple writer scenario.
*
* If you are doing writes in a single writer scenario, please look at
* {@link BlobRequestOptions#setAbsorbConditionalErrorsOnRetry(Boolean)} and see if setting this flag
* to true is acceptable for you.
*
* @param content
* A String which represents the content that will be appended to the blob.
*
* @throws StorageException
* If a storage service error occurred.
* @throws IOException
* If an I/O exception occurred.
*/
public void appendText(final String content) throws StorageException, IOException {
this.appendText(content, null /* charsetName */, null /* accessCondition */, null /* options */,
null /* opContext */);
}
/**
* Appends a string of text to an append blob using the specified encoding. This API should be used strictly in a
* single writer scenario because the API internally uses the append-offset conditional header to avoid duplicate
* blocks which does not work in a multiple writer scenario.
*
* If you are doing writes in a single writer scenario, please look at
* {@link BlobRequestOptions#setAbsorbConditionalErrorsOnRetry(Boolean)} and see if setting this flag
* to true is acceptable for you.
*
* @param content
* A String which represents the content that will be appended to the blob.
* @param charsetName
* A String which represents the name of the charset to use to encode the content.
* If null, the platform's default encoding is used.
* @param accessCondition
* An {@link AccessCondition} object that represents the access conditions for the blob.
* @param options
* A {@link BlobRequestOptions} object that specifies any additional options for the request. Specifying
* null will use the default request options from the associated service client (
* {@link CloudBlobClient}).
* @param opContext
* An {@link OperationContext} object that represents the context for the current operation. This object
* is used to track requests to the storage service, and to provide additional runtime information about
* the operation.
*
* @throws StorageException
* If a storage service error occurred.
* @throws IOException
* If an I/O exception occurred.
*/
public void appendText(final String content, final String charsetName, final AccessCondition accessCondition,
BlobRequestOptions options, OperationContext opContext) throws StorageException, IOException {
byte[] bytes = (charsetName == null) ? content.getBytes() : content.getBytes(charsetName);
this.appendFromByteArray(bytes, 0, bytes.length, accessCondition, options, opContext);
}
/**
* Opens an output stream object to write data to the append blob. The append blob must already exist and will be
* appended to.
*
* If you are doing writes in a single writer scenario, please look at
* {@link BlobRequestOptions#setAbsorbConditionalErrorsOnRetry(Boolean)} and see if setting this flag
* to true is acceptable for you.
*
* @return A {@link BlobOutputStream} object used to write data to the blob.
*
* @throws StorageException
* If a storage service error occurred.
*/
@DoesServiceRequest
public BlobOutputStream openWriteExisting() throws StorageException {
return this.openWriteExisting(null /* accessCondition */, null /* options */, null /* opContext */);
}
/**
* Opens an output stream object to write data to the append blob, using the specified lease ID, request options and
* operation context. The append blob must already exist and will be appended to.
*
* If you are doing writes in a single writer scenario, please look at
* {@link BlobRequestOptions#setAbsorbConditionalErrorsOnRetry(Boolean)} and see if setting this flag
* to true is acceptable for you.
*
* @param accessCondition
* An {@link AccessCondition} object which represents the access conditions for the blob.
* @param options
* A {@link BlobRequestOptions} object that specifies any additional options for the request. Specifying
* null will use the default request options from the associated service client (
* {@link CloudBlobClient}).
* @param opContext
* An {@link OperationContext} object which represents the context for the current operation. This object
* is used to track requests to the storage service, and to provide additional runtime information about
* the operation.
*
* @return A {@link BlobOutputStream} object used to write data to the blob.
*
* @throws StorageException
* If a storage service error occurred.
*/
@DoesServiceRequest
public BlobOutputStream openWriteExisting(AccessCondition accessCondition, BlobRequestOptions options,
OperationContext opContext) throws StorageException {
return this.openOutputStreamInternal(false, accessCondition, options, opContext);
}
/**
* Opens an output stream object to write data to the append blob. The append blob does not need to yet exist. If
* the blob already exists, this will replace it.
*
* To avoid overwriting and instead throw an error, please use the
* {@link #openWriteNew(AccessCondition, BlobRequestOptions, OperationContext)} overload with the appropriate
* {@link AccessCondition}.
*
* If you are doing writes in a single writer scenario, please look at
* {@link BlobRequestOptions#setAbsorbConditionalErrorsOnRetry(Boolean)} and see if setting this flag
* to true is acceptable for you.
*
* @return A {@link BlobOutputStream} object used to write data to the blob.
*
* @throws StorageException
* If a storage service error occurred.
*/
@DoesServiceRequest
public BlobOutputStream openWriteNew() throws StorageException {
return this.openWriteNew(null /* accessCondition */, null /* options */, null /* opContext */);
}
/**
* Opens an output stream object to write data to the append blob, using the specified lease ID, request options and
* operation context. The append blob does not need to yet exist. If the blob already exists, this will replace it.
*
* To avoid overwriting and instead throw an error, please pass in an {@link AccessCondition} generated using
* {@link AccessCondition#generateIfNotExistsCondition()}.
*
* If you are doing writes in a single writer scenario, please look at
* {@link BlobRequestOptions#setAbsorbConditionalErrorsOnRetry(Boolean)} and see if setting this flag
* to true is acceptable for you.
*
* @param accessCondition
* An {@link AccessCondition} object which represents the access conditions for the blob.
* @param options
* A {@link BlobRequestOptions} object that specifies any additional options for the request. Specifying
* null will use the default request options from the associated service client (
* {@link CloudBlobClient}).
* @param opContext
* An {@link OperationContext} object which represents the context for the current operation. This object
* is used to track requests to the storage service, and to provide additional runtime information about
* the operation.
*
* @return A {@link BlobOutputStream} object used to write data to the blob.
*
* @throws StorageException
* If a storage service error occurred.
*/
@DoesServiceRequest
public BlobOutputStream openWriteNew(AccessCondition accessCondition,
BlobRequestOptions options, OperationContext opContext) throws StorageException {
return this.openOutputStreamInternal(true, accessCondition, options, opContext);
}
/**
* Opens an output stream object to write data to the append blob, using the specified lease ID, request options and
* operation context.
*
* @param accessCondition
* An {@link AccessCondition} object which represents the access conditions for the blob.
* @param options
* A {@link BlobRequestOptions} object that specifies any additional options for the request. Specifying
* null will use the default request options from the associated service client (
* {@link CloudBlobClient}).
* @param opContext
* An {@link OperationContext} object which represents the context for the current operation. This object
* is used to track requests to the storage service, and to provide additional runtime information about
* the operation.
*
* @return A {@link BlobOutputStream} object used to write data to the blob.
*
* @throws StorageException
* If a storage service error occurred.
*/
private BlobOutputStream openOutputStreamInternal(boolean create, AccessCondition accessCondition,
BlobRequestOptions options, OperationContext opContext) throws StorageException {
assertNoWriteOperationForSnapshot();
if (opContext == null) {
opContext = new OperationContext();
}
options = BlobRequestOptions.populateAndApplyDefaults(options, BlobType.APPEND_BLOB, this.blobServiceClient,
false /* setStartTime */);
options.assertPolicyIfRequired();
Cipher cipher = null;
if(options.getEncryptionPolicy() != null) {
cipher = options.getEncryptionPolicy().createAndSetEncryptionContext(this.getMetadata(),
false /* noPadding */);
}
if (create) {
this.createOrReplace(accessCondition, options, opContext);
} else {
if (options.getStoreBlobContentMD5()) {
throw new IllegalArgumentException(SR.APPEND_BLOB_MD5_NOT_POSSIBLE);
}
if (options.getEncryptionPolicy() != null) {
throw new IllegalArgumentException(SR.ENCRYPTION_NOT_SUPPORTED_FOR_EXISTING_BLOBS);
}
// Download attributes to check the etag and date access conditions and
// to get the blob length to verify the append position on the first write.
this.downloadAttributes(accessCondition, options, opContext);
}
// Use an access condition with the etag and date conditions removed as we will be
// appending to the blob and these properties will change each time we append a block.
AccessCondition appendCondition = new AccessCondition();
if (accessCondition != null) {
appendCondition.setLeaseID(accessCondition.getLeaseID());
appendCondition.setIfAppendPositionEqual(accessCondition.getIfAppendPositionEqual());
appendCondition.setIfMaxSizeLessThanOrEqual(accessCondition.getIfMaxSizeLessThanOrEqual());
}
if(options.getEncryptionPolicy() != null) {
return new BlobEncryptStream(this, appendCondition, options, opContext, cipher);
} else {
return new BlobOutputStreamInternal(this, appendCondition, options, opContext);
}
}
/**
* Uploads the source stream data to the append blob. If the blob already exists on the service, it will be
* overwritten.
*
* If you want to append data to an already existing blob, please see {@link #appendBlock(InputStream, long)}.
*
* If you are doing writes in a single writer scenario, please look at
* {@link BlobRequestOptions#setAbsorbConditionalErrorsOnRetry(Boolean)} and see if setting this flag
* to true is acceptable for you.
*
* @param sourceStream
* An {@link InputStream} object to read from.
* @param length
* A long which represents the length, in bytes, of the stream data, or -1 if unknown.
*
* @throws IOException
* If an I/O exception occurred.
* @throws StorageException
* If a storage service error occurred.
*/
@Override
@DoesServiceRequest
public void upload(final InputStream sourceStream, final long length) throws StorageException, IOException {
this.upload(sourceStream, length, null /* accessCondition */, null /* options */, null /* opContext */);
}
/**
* Uploads the source stream data to the append blob using the specified lease ID, request options, and operation
* context. If the blob already exists on the service, it will be overwritten.
*
* If you want to append data to an already existing blob, please see {@link #appendBlock(InputStream, long)}.
*
* If you are doing writes in a single writer scenario, please look at
* {@link BlobRequestOptions#setAbsorbConditionalErrorsOnRetry(Boolean)} and see if setting this flag
* to true is acceptable for you.
*
* @param sourceStream
* An {@link InputStream} object to read from.
* @param length
* A long which represents the length, in bytes, of the stream data, or -1 if unknown.
* @param accessCondition
* An {@link AccessCondition} object which represents the access conditions for the blob.
* @param options
* A {@link BlobRequestOptions} object that specifies any additional options for the request. Specifying
* null will use the default request options from the associated service client (
* {@link CloudBlobClient}).
* @param opContext
* An {@link OperationContext} object which represents the context for the current operation. This object
* is used to track requests to the storage service, and to provide additional runtime information about
* the operation.
*
* @throws IOException
* If an I/O exception occurred.
* @throws StorageException
* If a storage service error occurred.
*/
@Override
@DoesServiceRequest
public void upload(final InputStream sourceStream, final long length, final AccessCondition accessCondition,
BlobRequestOptions options, OperationContext opContext) throws StorageException, IOException {
assertNoWriteOperationForSnapshot();
if (opContext == null) {
opContext = new OperationContext();
}
options = BlobRequestOptions.populateAndApplyDefaults(options, BlobType.APPEND_BLOB, this.blobServiceClient);
if (sourceStream.markSupported()) {
// Mark sourceStream for current position.
sourceStream.mark(Constants.MAX_MARK_LENGTH);
}
final BlobOutputStream streamRef = this.openWriteNew(accessCondition, options, opContext);
try {
streamRef.write(sourceStream, length);
}
finally {
streamRef.close();
}
}
/**
* Sets the number of bytes to buffer when writing to a {@link BlobOutputStream}.
*
* @param streamWriteSizeInBytes
* An int which represents the maximum block size, in bytes, for writing to an append blob
* while using a {@link BlobOutputStream} object, ranging from 16 KB to 4 MB, inclusive.
*
* @throws IllegalArgumentException
* If streamWriteSizeInBytes is less than 16 KB or greater than 4 MB.
*/
@Override
public void setStreamWriteSizeInBytes(final int streamWriteSizeInBytes) {
if (streamWriteSizeInBytes > Constants.MAX_APPEND_BLOCK_SIZE || streamWriteSizeInBytes < 16 * Constants.KB) {
throw new IllegalArgumentException("StreamWriteSizeInBytes");
}
this.streamWriteSizeInBytes = streamWriteSizeInBytes;
}
}