Azure storage datalake service

Since Camel 3.8

Both producer and consumer are supported

The Azure storage datalake component is used for storing and retrieving file from Azure Storage Datalake Sevice using the Azure APIs v12.

Prerequisites

You need to have a valid Azure account with Azure storage set up. More information can be found at Azure Documentation Portal.

Maven users will need to add the following dependency to their pom.xml for this component.

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-azure-storage-datalake</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your camel core version -->
</dependency>

Uri Format

azure-storage-datalake:accountName[/fileSystemName][?options]

In case of a consumer, both accountName and fileSystemName are required. In case of the producer, it depends on the operation being requested.

You can append query options to the URI in the following format, ?option1=value&option2=value&…​

For example, in order to download content from file test.txt located on the filesystem in camelTesting storage account, use the following snippet:

from("azure-storage-datalake:camelTesting/filesystem?fileName=test.txt&accountKey=key").
to("file://fileDirectory");

Uri Options

The Azure storage datalake service component supports 33 options, which are listed below.

Name Description Default Type

accountKey (common)

account key for authentication

String

clientId (common)

client id for azure account

String

clientSecret (common)

client secret for azure account

String

clientSecretCredential (common)

client secret credential for authentication

ClientSecretCredential

close (common)

Whether or not a file changed event raised indicates completion (true) or modification (false)

Boolean

closeStreamAfterRead (common)

check for closing stream after read

Boolean

configuration (common)

configuration object for datalake

DataLakeConfiguration

dataCount (common)

count number of bytes to download

Long

directoryName (common)

directory of the file to be handled in component

String

downloadLinkExpiration (common)

download link expiration time

Long

expression (common)

expression for queryInputStream

String

fileDir (common)

directory of file to do operations in the local system

String

fileName (common)

name of file to be handled in component

String

fileOffset (common)

offset position in file for different operations

Long

maxResults (common)

maximum number of results to show at a time

Integer

maxRetryRequests (common)

no of retries to a given request

int

openOptions (common)

set open options for creating file

Set

path (common)

path in azure datalake for operations

String

permission (common)

permission string for the file

String

position (common)

This parameter allows the caller to upload data in parallel and control the order in which it is appended to the file.

Long

recursive (common)

recursively include all paths

Boolean

regex (common)

regular expression for matching file names

String

retainUncommitedData (common)

Whether or not uncommitted data is to be retained after the operation

Boolean

serviceClient (common)

Autowired datalake service client for azure storage datalake

DataLakeServiceClient

sharedKeyCredential (common)

shared key credential for azure datalake gen2

StorageSharedKeyCredential

tenantId (common)

tenant id for azure account

String

timeout (common)

Timeout for operation

Duration

umask (common)

umask permission for file

String

userPrincipalNameReturned (common)

whether or not to use upn

Boolean

bridgeErrorHandler (consumer)

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

false

boolean

lazyStartProducer (producer)

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

boolean

operation (producer)

operation to be performed. There are 2 enums and the value can be one of: listFileSystem, listFiles

listFileSystem

DataLakeOperationsDefinition

autowiredEnabled (advanced)

Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.

true

boolean

The Azure storage datalake service endpoint is configured using URI syntax:

azure-storage-datalake:accountName/fileSystemName

with the following path and query parameters:

Path Parameters (2 parameters):

Name Description Default Type

accountName

name of the azure account

String

fileSystemName

name of filesystem to be used

String

Query Parameters (50 parameters):

Name Description Default Type

accountKey (common)

account key for authentication

String

clientId (common)

client id for azure account

String

clientSecret (common)

client secret for azure account

String

clientSecretCredential (common)

client secret credential for authentication

ClientSecretCredential

close (common)

Whether or not a file changed event raised indicates completion (true) or modification (false)

Boolean

closeStreamAfterRead (common)

check for closing stream after read

Boolean

dataCount (common)

count number of bytes to download

Long

dataLakeServiceClient (common)

service client of datalake

DataLakeServiceClient

directoryName (common)

directory of the file to be handled in component

String

downloadLinkExpiration (common)

download link expiration time

Long

expression (common)

expression for queryInputStream

String

fileDir (common)

directory of file to do operations in the local system

String

fileName (common)

name of file to be handled in component

String

fileOffset (common)

offset position in file for different operations

Long

maxResults (common)

maximum number of results to show at a time

Integer

maxRetryRequests (common)

no of retries to a given request

int

openOptions (common)

set open options for creating file

Set

path (common)

path in azure datalake for operations

String

permission (common)

permission string for the file

String

position (common)

This parameter allows the caller to upload data in parallel and control the order in which it is appended to the file.

Long

recursive (common)

recursively include all paths

Boolean

regex (common)

regular expression for matching file names

String

retainUncommitedData (common)

Whether or not uncommitted data is to be retained after the operation

Boolean

serviceClient (common)

Autowired datalake service client for azure storage datalake

DataLakeServiceClient

sharedKeyCredential (common)

shared key credential for azure datalake gen2

StorageSharedKeyCredential

tenantId (common)

tenant id for azure account

String

timeout (common)

Timeout for operation

Duration

umask (common)

umask permission for file

String

userPrincipalNameReturned (common)

whether or not to use upn

Boolean

bridgeErrorHandler (consumer)

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

false

boolean

sendEmptyMessageWhenIdle (consumer)

If the polling consumer did not poll any files, you can enable this option to send an empty message (no body) instead.

false

boolean

exceptionHandler (consumer)

To let the consumer use a custom ExceptionHandler. Notice if the option bridgeErrorHandler is enabled then this option is not in use. By default the consumer will deal with exceptions, that will be logged at WARN or ERROR level and ignored.

ExceptionHandler

exchangePattern (consumer)

Sets the exchange pattern when the consumer creates an exchange. There are 3 enums and the value can be one of: InOnly, InOut, InOptionalOut

ExchangePattern

pollStrategy (consumer)

A pluggable org.apache.camel.PollingConsumerPollingStrategy allowing you to provide your custom implementation to control error handling usually occurred during the poll operation before an Exchange have been created and being routed in Camel.

PollingConsumerPollStrategy

lazyStartProducer (producer)

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

boolean

operation (producer)

operation to be performed. There are 2 enums and the value can be one of: listFileSystem, listFiles

listFileSystem

DataLakeOperationsDefinition

backoffErrorThreshold (scheduler)

The number of subsequent error polls (failed due some error) that should happen before the backoffMultipler should kick-in.

int

backoffIdleThreshold (scheduler)

The number of subsequent idle polls that should happen before the backoffMultipler should kick-in.

int

backoffMultiplier (scheduler)

To let the scheduled polling consumer backoff if there has been a number of subsequent idles/errors in a row. The multiplier is then the number of polls that will be skipped before the next actual attempt is happening again. When this option is in use then backoffIdleThreshold and/or backoffErrorThreshold must also be configured.

int

delay (scheduler)

Milliseconds before the next poll.

500

long

greedy (scheduler)

If greedy is enabled, then the ScheduledPollConsumer will run immediately again, if the previous run polled 1 or more messages.

false

boolean

initialDelay (scheduler)

Milliseconds before the first poll starts.

1000

long

repeatCount (scheduler)

Specifies a maximum limit of number of fires. So if you set it to 1, the scheduler will only fire once. If you set it to 5, it will only fire five times. A value of zero or negative means fire forever.

0

long

runLoggingLevel (scheduler)

The consumer logs a start/complete log line when it polls. This option allows you to configure the logging level for that. There are 6 enums and the value can be one of: TRACE, DEBUG, INFO, WARN, ERROR, OFF

TRACE

LoggingLevel

scheduledExecutorService (scheduler)

Allows for configuring a custom/shared thread pool to use for the consumer. By default each consumer has its own single threaded thread pool.

ScheduledExecutorService

scheduler (scheduler)

To use a cron scheduler from either camel-spring or camel-quartz component. Use value spring or quartz for built in scheduler

none

Object

schedulerProperties (scheduler)

To configure additional properties when using a custom scheduler or any of the Quartz, Spring based scheduler.

Map

startScheduler (scheduler)

Whether the scheduler should be auto started.

true

boolean

timeUnit (scheduler)

Time unit for initialDelay and delay options. There are 7 enums and the value can be one of: NANOSECONDS, MICROSECONDS, MILLISECONDS, SECONDS, MINUTES, HOURS, DAYS

MILLISECONDS

TimeUnit

useFixedDelay (scheduler)

Controls if fixed delay or fixed rate is used. See ScheduledExecutorService in JDK for details.

true

boolean

Methods of authentication

In order to use this component, you will have to provide at least one of the below given points for authentication purposes.

  • Provide accountName and accessKey for your azure account.

  • Provide StorageSharedKeyCredential instance which can be provided into sharedKeyCredential option.

  • Provide ClientSecretCredential instance which can be provided into clientSecretCredential option.

  • Provide accountName, clientId, clientSecret and tenantId for authentication with Azure Active Directory.

  • Provide a DataLakeServiceClient instance which can be provided into serviceClient option.

Batch Consumer

This component implements the Batch Consumer.

This allows you to know how many messages exists in this batch and let the Aggregator aggregate this number of messages.

Usage

Message Headers specified by user

Header Variable Name Type Description

CamelAzureStorageDataLakeListFileSystemsOptions

DataLakeConstants.LIST_FILESYSTEMS_OPTIONS

ListFileSystemsOptions

Defines options available to configure the behavior of a call to listFileSystemsSegment on a DataLakeServiceAsyncClient object. Null may be passed.

CamelAzureStorageDataLakeTimeout

DataLakeConstants.TIMEOUT

Duration

An optional timeout value beyond which a RuntimeException will be raised.

CamelAzureStorageDataLakeOperation

DataLakeConstants.DATALAKE_OPERATION

DataLakeOperationsDefinition

Specify the producer operation to execute. Different operations allowed are shown below.

CamelAzureStorageDataLakeFileSystemName

DataLakeConstants.FILESYSTEM_NAME

String

Name of the file system in azure datalake on which operation is to be performed. Please make sure that filesystem name is all lowercase.

CamelAzureStorageDataLakeDirectoryName

DataLakeConstants.DIRECTORY_NAME

String

Name of the directory in azure datalake on which operation is to be performed.

CamelAzureStorageDataLakeFileName

DataLakeConstants.FILE_NAME

String

Name of the file in azure datalake on which operation is to be performed.

CamelAzureStorageDataLakeMetadata

DataLakeConstants.METADATA

Map<String,String>

The metadata to associate with the file.

CamelAzureStorageDataLakePublicAccessType

DataLakeConstants.PUBLIC_ACCESS_TYPE

PublicAccessType

CamelAzureStorageDataLakeRequestCondition

DataLakeConstants.DATALAKE_REQUEST_CONDITION

DataLakeRequestConditions

This contains values which will restrict the successful operation of a variety of requests to the conditions present. These conditions are entirely optional.

CamelAzureStorageDataLakeListPathOptions

DataLakeConstants.LIST_PATH_OPTIONS

ListPathOptions

Defines options available to configure the behavior of a call to listContainersSegment on a DataLakeFileSystemClient object. Null may be passed.

CamelAzureStorageDataLakePath

DataLakeConstants.PATH

String

Path of the file to be used for upload operations.

CamelAzureStorageDataLakeRecursive

DataLakeConstants.RECURSIVE

Boolean

Specifies if the call to listContainersSegment should recursively include all paths.

CamelAzureStorageDataLakeMaxResults

DataLakeConstants.MAX_RESULTS

Integer

Specifies the maximum number of blobs to return, including all BlobPrefix elements.

CamelAzureStorageDataLakeUserPrincipalNameReturned

DataLakeConstants.USER_PRINCIPAL_NAME_RETURNED

Boolean

CamelAzureStorageDataLakeRegex

DataLakeConstants.REGEX

String

Filter the results to return only those files with match the specified regular expression.

CamelAzureStorageDataLakeFileDir

DataLakeConstants.FILE_DIR

String

Directory in which the file is to be downloaded.

CamelAzureStorageDataLakeContentMD5

DataLakeConstants.CONTENT_MD5

byte[]

An MD5 hash of the content. The hash is used to verify the intergity of the file during transport.

CamelAzureStorageDataLakeFileRange

DataLakeConstants.FILE_RANGE

FileRange

This is a representation of a range of bytes on a file, typically used during a download operation. Passing null as a FileRange value will default to the entire range of the file.

CamelAzureStorageDataLakeParallelTransferOptions

DataLakeConstants.PARALLEL_TRANSFER_OPTIONS

ParallelTransferOptions

CamelAzureStorageDataLakeOpenOptions

DataLakeConstants.OPEN_OPTIONS

Set<OpenOption>

Set of OpenOption used to configure how to open or create a file.

CamelAzureStorageDataLakeIncrementalCopy

DataLakeConstants.INCREMENTAL_COPY

Boolean

Flag indicating if the file was incrementally copied.

CamelAzureStorageDataLakeDownloadLinkExpiration

DataLakeConstants.DOWNLOAD_LINK_EXPIRATION

Long

Set the Expiration time of the download link.

CamelAzureStorageDataLakeFileOffset

DataLakeConstants.FILE_OFFSET

Long

The position where the data is to be appended.

CamelAzureStorageDataLakeLeaseId

DataLakeConstants.LEASE_ID

String

By setting lease id, requests will fail if the provided lease does not match the active lease on the file.

CamelAzureStorageDataLakePathHttpHeaders

DataLakeConstants.PATH_HTTP_HEADERS

PathHttpHeaders

Additional parameters for a set of operations.

CamelAzureStorageDataLakeRetainCommitedData

DataLakeConstants.RETAIN_UNCOMMITED_DATA

Boolean

Determines Whether or not uncommitted data is to be retained after the operation.

CamelAzureStorageDataLakeClose

DataLakeConstants.CLOSE

Boolean

Whether or not a file changed event raised indicates completion (true) or modification (false).

CamelAzureStorageDataLakePosition

DataLakeConstants.POSITION

Long

The length of the file after all data has been written.

CamelAzureStorageDataLakeExpression

DataLakeConstants.EXPRESSION

String

The query expression on the file.

CamelAzureStorageDataLakeInputSerialization

DataLakeConstants.INPUT_SERIALIZATION

FileQuerySerialization

Defines the input serialization for a file query request. either FileQueryJsonSerialization or FileQueryDelimitedSerialization

CamelAzureStorageDataLakeOutputSerialization

DataLakeConstants.OUTPUT_SERIALIZATION

FileQuerySerialization

Defines the output serialization for a file query request. either FileQueryJsonSerialization or FileQueryDelimitedSerialization

CamelAzureStorageDataLakeErrorConsumer

DataLakeConstants.ERROR_CONSUMER

Consumer<FileQueryError>

Sets error consumer for file query

CamelAzureStorageDataLakeProgressConsumer

DataLakeConstants.PROGRESS_CONSUMER

Consumer<FileQueryProgress>

Sets progress consumer for file query

CamelAzureStorageDataLakeQueryOptions

DataLakeConstants.QUERY_OPTIONS

FileQueryOptions

Optional parameters for File Query.

CamelAzureStorageDataLakePermission

DataLakeConstants.PERMISSION

String

Sets the permission for file.

CamelAzureStorageDataLakeUmask

DataLakeConstants.UMASK

String

Sets the umask for file.

Message headers set by the component

Header Variable Name Type Description

CamelAzureStorageDataLakeMetadata

DataLakeConstants.METADATA

Map<String,String>

The metadata to associate with the file.

CamelAzureStorageDataLakeRawHttpHeaders

DataLakeConstants.RAW_HTTP_HEADERS

HttpHeaders

Non parsed http headers that can be used by the user.

CamelAzureStorageDataLakeAccessTier

DataLakeConstants.ACCESS_TIER

AccessTier

Access tier of file.

CamelAzureStorageDataLakeAccessTierChangeTime

DataLakeConstants.ACCESS_TIER_CHANGE_TIME

OffsetDateTime

Datetime when the access tier of the blob last changed.

CamelAzureStorageDataLakeArchiveStatus

DataLakeConstants.ARCHIVE_STATUS

ArchiveStatus

Archive status of file.

CamelAzureStorageDataLakeCacheControl

DataLakeConstants.CACHE_CONTROL

String

Cache control specified for the file.

CamelAzureStorageDataLakeContentDisposition

DataLakeConstants.CONTENT_DISPOSITION

String

Content disposition specified for the file.

CamelAzureStorageDataLakeContentEncoding

DataLakeConstants.CONTENT_ENCODING

String

Content encoding specified for the file.

CamelAzureStorageDataLakeContentLanguage

DataLakeConstants.CONTENT_LANGUAGE

String

Content language specified for the file.

CamelAzureStorageDataLakeContentType

DataLakeConstants.CONTENT_TYPE

String

Content type specified for the file.

CamelAzureStorageDataLakeCopyCompletionTime

DataLakeConstants.COPY_COMPLETION_TIME

OffsetDateTime

Conclusion time of the last attempted Copy Blob operation where this file was the destination file.

CamelAzureStorageDataLakeCopyId

DataLakeConstants.COPY_ID

String

String identifier for this copy operation.

CamelAzureStorageDataLakeCopyProgress

DataLakeConstants.COPY_PROGRESS

String

Contains the number of bytes copied and the total bytes in the source in the last attempted Copy Blob operation where this file was the destination file.

CamelAzureStorageDataLakeCopySource

DataLakeConstants.COPY_SOURCE

String

URL up to 2 KB in length that specifies the source file or file used in the last attempted Copy Blob operation where this file was the destination file.

CamelAzureStorageDataLakeCopyStatus

DataLakeConstants.COPY_STATUS

CopyStatusType

Status of the last copy operation performed on the file.

CamelAzureStorageDataLakeCopyStatusDescription

DataLakeConstants.COPY_STATUS_DESCRIPTION

String

CamelAzureStorageDataLakeCreationTime

DataLakeConstants.CREATION_TIME

OffsetDateTime

Creation time of the file.

CamelAzureStorageDataLakeEncryptionKeySha256

DataLakeConstants.ENCRYPTION_KEY_SHA_256

String

The SHA-256 hash of the encryption key used to encrypt the file.

CamelAzureStorageDataLakeServerEncrypted

DataLakeConstants.SERVER_ENCRYPTED

Boolean

Flag indicating if the file’s content is encrypted on the server.

CamelAzureStorageDataLakeETag

DataLakeConstants.E_TAG

String

The E Tag of the file.

CamelAzureStorageDataLakeFileSize

DataLakeConstants.FILE_SIZE

Long

Size of the file.

CamelAzureStorageDataLakeLastModified

DataLakeConstants.LAST_MODIFIED

OffsetDateTime

Datetime when the file was last modified.

CamelAzureStorageDataLakeLeaseDuration

DataLakeConstants.LEASE_DURATION

LeaseDurationType

Type of lease on the file.

CamelAzureStorageDataLakeLeaseState

DataLakeConstants.LEASE_STATE

LeaseStateType

State of the lease on the file.

CamelAzureStorageDataLakeLeaseStatus

DataLakeConstants.LEASE_STATUS

LeaseStatusType

Status of the lease on the file.

CamelAzureStorageDataLakeDownloadLink

DataLakeConstants.DOWNLOAD_LINK

String

The link that can be used to download the file from datalake.

Automatic detection of service client

The component is capable of automatically detecting the presence of a DataLakeServiceClient bean in the registry. Hence, if your registry has only one instance of type DataLakeServiceClient, it will be automatically used as the default client. You won’t have to explicitly define it as an uri paramater.

Azure Storage DataLake Producer Operations

The various operations supported by Azure Storage DataLake are as given below:

Operations on Service level

For these operations, accountName option is required

Operation Description

listFileSystem

List all the file systems that are present in the given azure account.

Operations on File system level

For these operations, accountName and fileSystemName options are required

Operation Description

createFileSystem

Creates a new file System with the storage account

deleteFileSystem

Deletes the specified file system within the storage account

listPaths

Returns list of all the files within the given path in the given file system , with folder structure flattened

Operations on Directory level

For these operations, accountName, fileSystemName and directoryName options are required

Operation Description

createFile

Creates a new file in the specified directory within the fileSystem

deleteDirectory

Deletes the specified directory within the file system

Operations on file level

For these operations, accountName, fileSystemName and fileName options are required

Operation Description

getFile

Get the contents of a file

downloadToFile

Downloadd the entire file from the file system into a path specified by fileDir.

downloadLink

Generate download link for the specified file using Shared Access Signature (SAS). The expiration time to be set for the link can be specified otherwise 1 hour is taken as default.

deleteFile

Deletes the specified file.

appendToFile

Appends the data passed to the specified file in the file System. Flush command is required after append.

flushToFile

Flushes the data already appended to the specified file.

openQueryInputStream

Opens an inputstream based on the query passed to the endpoint. For this operation, you must first register the query acceleration feature with your subscription.

Refer the examples section below for more details on how to use these operations

Consumer Examples

To consume a file from the storage datalake into a file using the file component, this can be done like this:

from("azure-storage-datalake":cameltesting/filesystem?fileName=test.txt&accountKey=yourAccountKey").
to("file:/filelocation");

You can also directly write to a file without using the file component. For this, you will need to specify the path in fileDir option, to save it to your machine.

from("azure-storage-datalake":cameltesting/filesystem?fileName=test.txt&accountKey=yourAccountKey&fileDir=/test/directory").
to("mock:results");

This component also supports batch consumer. So, you can consume multiple files from a file system by specifying the path from where you want to consume the files.

from("azure-storage-datalake":cameltesting/filesystem?accountKey=yourAccountKey&fileDir=/test/directory&path=abc/test").
to("mock:results");

Producer Examples

  • listFileSystem

from("direct:start")
    .process(exchange -> {
        //required headers can be added here
        exchange.getIn().setHeader(DataLakeConstants.LIST_FILESYSTEMS_OPTIONS, new ListFileSystemsOptions().setMaxResultsPerPage(10));
    })
    .to("azure-storage-datalake:cameltesting?operation=listFileSystem&dataLakeServiceClient=#serviceClient")
    .to("mock:results");
  • createFileSystem

from("direct:start")
    .process(exchange -> {
        exchange.getIn().setHeader(DataLakeConstants.FILESYSTEM_NAME, "test1");
    })
    .to("azure-storage-datalake:cameltesting?operation=createFileSystem&dataLakeServiceClient=#serviceClient")
    .to("mock:results");
  • deleteFileSystem

from("direct:start")
    .process(exchange -> {
        exchange.getIn().setHeader(DataLakeConstants.FILESYSTEM_NAME, "test1");
    })
    .to("azure-storage-datalake:cameltesting?operation=deleteFileSystem&dataLakeServiceClient=#serviceClient")
    .to("mock:results");
  • listPaths

from("direct:start")
    .process(exchange -> {
        exchange.getIn().setHeader(DataLakeConstants.LIST_PATH_OPTIONS, new ListPathsOptions().setPath("/main"));
    })
    .to("azure-storage-datalake:cameltesting/filesystem?operation=listPaths&dataLakeServiceClient=#serviceClient")
    .to("mock:results");
  • getFile

This can be done in two ways, We can either set an outputstream in the exchange body

from("direct:start")
    .process(exchange -> {
        // set an outputstream where the file data can should be written
        exchange.getIn().setBody(outputStream);
    })
    .to("azure-storage-datalake:cameltesting/filesystem?operation=getFile&fileName=test.txt&dataLakeServiceClient=#serviceClient")
    .to("mock:results");

Or if body is not set, the operation will give an inputstream, given that you have already registered for query acceleration in azure portal.

from("direct:start")
    .to("azure-storage-datalake:cameltesting/filesystem?operation=getFile&fileName=test.txt&dataLakeServiceClient=#serviceClient")
    .process(exchange -> {
        InputStream inputStream = exchange.getMessage().getBody(InputStream.class);
        System.out.Println(IOUtils.toString(inputStream, StandardCharcets.UTF_8.name()));
    })
    .to("mock:results");
  • deleteFile

from("direct:start")
    .to("azure-storage-datalake:cameltesting/filesystem?operation=deleteFile&fileName=test.txt&dataLakeServiceClient=#serviceClient")
    .to("mock:results");
  • downloadToFile

from("direct:start")
    .to("azure-storage-datalake:cameltesting/filesystem?operation=downloadToFile&fileName=test.txt&fileDir=/test/mydir&dataLakeServiceClient=#serviceClient")
    .to("mock:results");
  • downloadLink

from("direct:start")
    .to("azure-storage-datalake:cameltesting/filesystem?operation=downloadLink&fileName=test.txt&dataLakeServiceClient=#serviceClient")
    .process(exchange -> {
        String link = exchange.getMessage().getBody(String.class);
        System.out.println(link);
    })
    .to("mock:results");
  • appendToFile

from("direct:start")
    .process(exchange -> {
        final String data = "test data";
        final InputStream inputStream = new ByteArrayInputStream(data.getBytes(StandardCharsets.UTF_8));
        exchange.getIn().setBody(inputStream);
    })
    .to("azure-storage-datalake:cameltesting/filesystem?operation=appendToFile&fileName=test.txt&dataLakeServiceClient=#serviceClient")
    .to("mock:results");
  • flushToFile

from("direct:start")
    .process(exchange -> {
        exchange.getIn().setHeader(DataLakeConstants.POSITION, 0);
    })
    .to("azure-storage-datalake:cameltesting/filesystem?operation=flushToFile&fileName=test.txt&dataLakeServiceClient=#serviceClient")
    .to("mock:results");
  • openQueryInputStream

For this operation, you should have already registered for query acceleration on the azure portal

from("direct:start")
    .process(exchange -> {
        exchange.getIn().setHeader(DataLakeConstants.QUERY_OPTIONS, new FileQueryOptions("SELECT * from BlobStorage"));
    })
    .to("azure-storage-datalake:cameltesting/filesystem?operation=openQueryInputStream&fileName=test.txt&dataLakeServiceClient=#serviceClient")
    .to("mock:results");
  • upload

from("direct:start")
    .process(exchange -> {
        final String data = "test data";
        final InputStream inputStream = new ByteArrayInputStream(data.getBytes(StandardCharsets.UTF_8));
        exchange.getIn().setBody(inputStream);
    })
    .to("azure-storage-datalake:cameltesting/filesystem?operation=upload&fileName=test.txt&dataLakeServiceClient=#serviceClient")
    .to("mock:results");
  • uploadFromFile

from("direct:start")
    .process(exchange -> {
        exchange.getIn().setHeader(DataLakeConstants.PATH, "test/file.txt");
    })
    .to("azure-storage-datalake:cameltesting/filesystem?operation=uploadFromFile&fileName=test.txt&dataLakeServiceClient=#serviceClient")
    .to("mock:results");
  • createFile

from("direct:start")
    .process(exchange -> {
        exchange.getIn().setHeader(DataLakeConstants.DIRECTORY_NAME, "test/file/");
    })
    .to("azure-storage-datalake:cameltesting/filesystem?operation=createFile&fileName=test.txt&dataLakeServiceClient=#serviceClient")
    .to("mock:results");
  • deleteDirectory

from("direct:start")
    .process(exchange -> {
        exchange.getIn().setHeader(DataLakeConstants.DIRECTORY_NAME, "test/file/");
    })
    .to("azure-storage-datalake:cameltesting/filesystem?operation=deleteDirectory&dataLakeServiceClient=#serviceClient")
    .to("mock:results");

Testing

Please run all the unit tests and integration test while making changes to the component as changes or version upgrades can break things. For running all the test in the component, you will need to obtain azure accountName and accessKey. After obtaining the same, you can run the full test, on this component directory, by running the following maven command

mvn verify -PfullTests -Dazure.storage.account.name=<accountName> -Dazure.storage.account.key=<accessKey>

You can also skip the integration test, and run only basic unit test by using the command

mvn test

Spring Boot Auto-Configuration

When using azure-storage-datalake with Spring Boot make sure to use the following Maven dependency to have support for auto configuration:

<dependency>
  <groupId>org.apache.camel.springboot</groupId>
  <artifactId>camel-azure-storage-datalake-starter</artifactId>
  <version>x.x.x</version>
  <!-- use the same version as your Camel core version -->
</dependency>

The component supports 34 options, which are listed below.

Name Description Default Type

camel.component.azure-storage-datalake.account-key

account key for authentication.

String

camel.component.azure-storage-datalake.autowired-enabled

Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.

true

Boolean

camel.component.azure-storage-datalake.bridge-error-handler

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

false

Boolean

camel.component.azure-storage-datalake.client-id

client id for azure account.

String

camel.component.azure-storage-datalake.client-secret

client secret for azure account.

String

camel.component.azure-storage-datalake.client-secret-credential

client secret credential for authentication. The option is a com.azure.identity.ClientSecretCredential type.

ClientSecretCredential

camel.component.azure-storage-datalake.close

Whether or not a file changed event raised indicates completion (true) or modification (false).

Boolean

camel.component.azure-storage-datalake.close-stream-after-read

check for closing stream after read.

Boolean

camel.component.azure-storage-datalake.configuration

configuration object for datalake. The option is a org.apache.camel.component.azure.storage.datalake.DataLakeConfiguration type.

DataLakeConfiguration

camel.component.azure-storage-datalake.data-count

count number of bytes to download.

Long

camel.component.azure-storage-datalake.directory-name

directory of the file to be handled in component.

String

download link expiration time.

Long

camel.component.azure-storage-datalake.enabled

Whether to enable auto configuration of the azure-storage-datalake component. This is enabled by default.

Boolean

camel.component.azure-storage-datalake.expression

expression for queryInputStream.

String

camel.component.azure-storage-datalake.file-dir

directory of file to do operations in the local system.

String

camel.component.azure-storage-datalake.file-name

name of file to be handled in component.

String

camel.component.azure-storage-datalake.file-offset

offset position in file for different operations.

Long

camel.component.azure-storage-datalake.lazy-start-producer

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

Boolean

camel.component.azure-storage-datalake.max-results

maximum number of results to show at a time.

Integer

camel.component.azure-storage-datalake.max-retry-requests

no of retries to a given request.

Integer

camel.component.azure-storage-datalake.open-options

set open options for creating file.

Set

camel.component.azure-storage-datalake.operation

operation to be performed.

DataLakeOperationsDefinition

camel.component.azure-storage-datalake.path

path in azure datalake for operations.

String

camel.component.azure-storage-datalake.permission

permission string for the file.

String

camel.component.azure-storage-datalake.position

This parameter allows the caller to upload data in parallel and control the order in which it is appended to the file.

Long

camel.component.azure-storage-datalake.recursive

recursively include all paths.

Boolean

camel.component.azure-storage-datalake.regex

regular expression for matching file names.

String

camel.component.azure-storage-datalake.retain-uncommited-data

Whether or not uncommitted data is to be retained after the operation.

Boolean

camel.component.azure-storage-datalake.service-client

datalake service client for azure storage datalake. The option is a com.azure.storage.file.datalake.DataLakeServiceClient type.

DataLakeServiceClient

camel.component.azure-storage-datalake.shared-key-credential

shared key credential for azure datalake gen2. The option is a com.azure.storage.common.StorageSharedKeyCredential type.

StorageSharedKeyCredential

camel.component.azure-storage-datalake.tenant-id

tenant id for azure account.

String

camel.component.azure-storage-datalake.timeout

Timeout for operation. The option is a java.time.Duration type.

Duration

camel.component.azure-storage-datalake.umask

umask permission for file.

String

camel.component.azure-storage-datalake.user-principal-name-returned

whether or not to use upn.

Boolean