public AzureFileSystemNode(AzureFileSystemNode parent,
string path, NodeType type)
{
if (parent == null) // root dir
this.parent = this;
else
this.parent = parent;
this.name = path; //absolute path
this.type = type;
/* no children inserted yet */
if (type == NodeType.DIRECTORY)
{
this.children = new Dictionary<string, AzureFileSystemNode>();
this.children["."] = this;
this.children[".."] = this.parent;
}
else
this.children = null;
}
public AzureFileSystem()
{
_initialized = false;
_rootPath = null;
_rootNode = null;
}
/* format device */
public void initialize(string id)
{
/* file system already initialized, return ASAP */
if (_initialized == true)
{
return;
}
/*
* no need to synchronize,
* since when intialize the file system, only one process/thread
* is active
*/
try
{
Microsoft.WindowsAzure.CloudStorageAccount.
SetConfigurationSettingPublisher(
(configName, configSetter) =>
{
configSetter(RoleEnvironment.
GetConfigurationSettingValue(configName));
}
);
var storageAccount =
CloudStorageAccount.FromConfigurationSetting(
"DataConnectionString");
var client = storageAccount.CreateCloudBlobClient();
/* get root path, create if not exists */
var user_container = client.GetContainerReference("user");
var blob = user_container.GetBlobReference("user/container/"+id);
_rootPath = client.GetContainerReference(blob.DownloadText());
_rootPath.CreateIfNotExist();
Stream root = new MemoryStream();
var root_blob = _rootPath.GetBlockBlobReference("/");
root_blob.Properties.ContentType = AFS_BINARY_MODE;
root_blob.UploadFromStream(root);
root.Close();
// CloudBlockBlob blob = _rootPath.GetBlockBlobReference("a/");
// blob.Properties.ContentType = "application/octet-stream";
// Stream a = new MemoryStream();
// blob.UploadFromStream(a);
// a.Close();
/* create root node */
_rootNode = new AzureFileSystemNode(null, AFS_ROOT,
NodeType.DIRECTORY);
}
catch (WebException e)
{
System.Diagnostics.Trace.TraceError(
"An error occurs while intializing Azure file system. {0}",
e.Message);
}
_initialized = true;
System.Diagnostics.Trace.TraceInformation(
"Azure file system format complete!");
}