Package org.nuxeo.ecm.core.blob

Class EmptyBlobStore

  • All Implemented Interfaces:
    BlobStore
    public class EmptyBlobStore
extends AbstractBlobStore
    Blob store that stores nothing, useful only when there's a cache in front of it; mostly for unit tests.
    Since:
    11.5

    • Constructor Detail

    • Method Detail

      • copyBlobIsOptimized

        public boolean copyBlobIsOptimized​(BlobStore sourceStore)
        Description copied from interface: BlobStore
        Checks if blob copy/move from another blob store to this one can be done efficiently.
        Specified by:
        copyBlobIsOptimized in interface BlobStore
        Overrides:
        copyBlobIsOptimized in class AbstractBlobStore
        Parameters:
        sourceStore - the source store
        Returns:
        true if the copy/move can be done efficiently

      • copyOrMoveBlob

        public String copyOrMoveBlob​(String key,
                             BlobStore sourceStore,
                             String sourceKey,
                             boolean atomicMove)
                      throws IOException
        Description copied from interface: BlobStore
        Writes a file based on a key, as an optimized copy/move from a source in another compatible blob store.

        The target key may be null, which is a signal from the caller that it has determined that deduplication is enabled and async digest computation is enabled, but the needed digest hasn't been computed, so this method should either find the digest in an efficient way if it can, or otherwise trigger an async digest computation.

        If the copy/move is requested to be atomic, then the destination file is created atomically. In case of atomic move, in some stores the destination will be created atomically but the source will only be deleted afterwards.

        The returned key may be different than the passed one when versioning is used.

        Parameters:
        key - the key; or null if the store should choose it or trigger async digest computation
        sourceStore - the source store
        sourceKey - the source key
        atomicMove - true for an atomic move, false for a regular copy
        Returns:
        the key of the copied/moved file, or null if copy/move failed
        Throws:
        IOException

      • getFile

        public BlobStore.OptionalOrUnknown<Path> getFile​(String key)
        Description copied from interface: BlobStore
        Gets an already-existing file containing the blob for the given key, if present.

        Note that this method is best-effort, it may return unknown even though the blob exists in the store, it's just that it's not handily available locally in a file.

        Parameters:
        key - the blob key
        Returns:
        the file containing the blob, or empty if the blob cannot be found, or unknown if no file is available locally

      • getStream

        public BlobStore.OptionalOrUnknown<InputStream> getStream​(String key)
                                                   throws IOException
        Description copied from interface: BlobStore
        Gets the stream of the blob for the given key, if present.

        Note that this method is best-effort, it may return unknown even though the blob exists in the store, it's just that it's not efficient to return it as a stream.

        Parameters:
        key - the blob key
        Returns:
        the blob stream, or empty if the blob cannot be found, or unknown if no stream is efficiently available
        Throws:
        IOException

      • readBlob

        public boolean readBlob​(String key,
                        Path dest)
                 throws IOException
        Description copied from interface: BlobStore
        Reads a blob based on its key into the given file.
        Parameters:
        key - the blob key
        dest - the file to use to store the fetched data
        Returns:
        true if the file was fetched, false if the file was not found
        Throws:
        IOException

      • deleteBlob

        public void deleteBlob​(String key)
        Description copied from interface: BlobStore
        Deletes a blob based on a key. No error occurs if the blob does not exist.

        This method does not throw IOException, but may log an error message.

        Parameters:
        key - the blob key

      • clear

        public void clear()
        Description copied from interface: BlobStore
        INTERNAL (TESTS). Clears the blob store of all its data.