FileStorage

The FileStorage interface is responsible for managing auxiliary files like thumbnails or files referenced by the AAS model.

In-Memory

The In-Memory FileStorage keeps all files stored in memory. This means, that once FA³ST Service is stopped or crashes, all changes made during runtime are lost.

Configuration

In-Memory FileStorage does not support any configuration parameters.

Example

Example configuration for In-Memory FileStorage.

{
    "fileStorage":
    {
        "@class": "org.eclipse.digitaltwin.fa3st.service.filestorage.memory.FileStorageInMemory"
    },
    //...
}

FileSystem

The FileSystem-based FileStorage keeps all files stored in the file system of the local machine. Any change request, such as changing a file, results in a change in the file system. Thus, changes are stored permanently.

Configuration

Configuration properties of FileSystem FileStorage.

Name	Allowed Value	Description	Default Value
existingDataPath (optional)	String	A path/directory containing data that should be available on start-up. This data will never be modified or deleted.
path (optional)	String	The path/directory to use for storing the files.	.

Example

Example configuration for FileSystem FileStorage.

{
    "fileStorage":
    {
        "@class": "org.eclipse.digitaltwin.fa3st.service.filestorage.filesystem.FileStorageFilesystem",
        "path": "./my/file/cache",
        "existingDataPath": "./my/initial/data"
    },
    //...
}