/// <summary>
/// Directly opens and reads from the specified file, without requiring
/// a redirect. This API is NOT webhdfs compliant. It should be used
/// only by tools that do not rely on webhdfs interoperability.
/// </summary>
/// <param name='operations'>
/// Reference to the
/// Microsoft.Azure.Management.DataLake.StoreFileSystem.IFileSystemOperations.
/// </param>
/// <param name='filePath'>
/// Required. The path to the file to open.
/// </param>
/// <param name='accountName'>
/// Required. The name of the account to use
/// </param>
/// <param name='parameters'>
/// Optional. The optional parameters to pass to the open operation
/// </param>
/// <returns>
/// The data from the file requested.
/// </returns>
public static Task<FileOpenResponse> DirectOpenAsync(this IFileSystemOperations operations, string filePath, string accountName, FileOpenParameters parameters)
{
return operations.DirectOpenAsync(filePath, accountName, parameters, CancellationToken.None);
}
/// <summary>
/// Directly opens and reads from the specified file, without requiring
/// a redirect. This API is NOT webhdfs compliant. It should be used
/// only by tools that do not rely on webhdfs interoperability.
/// </summary>
/// <param name='operations'>
/// Reference to the
/// Microsoft.Azure.Management.DataLake.StoreFileSystem.IFileSystemOperations.
/// </param>
/// <param name='filePath'>
/// Required. The path to the file to open.
/// </param>
/// <param name='accountName'>
/// Required. The name of the account to use
/// </param>
/// <param name='parameters'>
/// Optional. The optional parameters to pass to the open operation
/// </param>
/// <returns>
/// The data from the file requested.
/// </returns>
public static FileOpenResponse DirectOpen(this IFileSystemOperations operations, string filePath, string accountName, FileOpenParameters parameters)
{
return Task.Factory.StartNew((object s) =>
{
return ((IFileSystemOperations)s).DirectOpenAsync(filePath, accountName, parameters);
}
, operations, CancellationToken.None, TaskCreationOptions.None, TaskScheduler.Default).Unwrap().GetAwaiter().GetResult();
}
public byte[] ReadFromFile(string filePath, string accountName, long offset, long bytesToRead)
{
var parameters = new FileOpenParameters
{
Length = bytesToRead,
Offset = offset
};
var response = _client.FileSystem.BeginOpen(filePath, accountName, parameters);
return _client.FileSystem.Open(response.Location).FileContents;
}
/// <summary>
/// Initiates a file open (read) request, resulting in a return of the
/// data node location that will service the request.
/// </summary>
/// <param name='operations'>
/// Reference to the
/// Microsoft.Azure.Management.DataLake.StoreFileSystem.IFileSystemOperations.
/// </param>
/// <param name='filePath'>
/// Required. The path to the file to open.
/// </param>
/// <param name='accountName'>
/// Required. The name of the account to use
/// </param>
/// <param name='parameters'>
/// Optional. The optional parameters to pass to the open operation
/// </param>
/// <returns>
/// The response recieved after the BeginOpen, BeginCreate and
/// BeginAppend requests.
/// </returns>
public static Task<FileCreateOpenAndAppendResponse> BeginOpenAsync(this IFileSystemOperations operations, string filePath, string accountName, FileOpenParameters parameters)
{
return operations.BeginOpenAsync(filePath, accountName, parameters, CancellationToken.None);
}
public byte[] ReadFromFile(string filePath, string accountName, long offset, long bytesToRead)
{
var parameters = new FileOpenParameters
{
Length = bytesToRead,
Offset = offset
};
return _client.FileSystem.DirectOpen(filePath, accountName, parameters).FileContents;
}
