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The DocumentBlobManager service is in charge of determining for read and write operations which Blob Provider should be used depending on various parameters.

Getting associated thumbnail of a binary streamĪs we will see later in this page, the Nuxeo Platform is shipped with several Blob Provider implementations:Īs a specialization, a Blob Provider can implement the interface DocumentBlobProvider if it is capable of dealing with advanced document-related operations like versioning.Ī Nuxeo Platform instance can make use of several Blob Providers on the same instance.

This method returns an id for identifying the blob and this id starts by a prefix that gives the Blob Provider used to retrieve it.Ī Blob Provider is a component that provides an API to read and write binary streams as well as additional services such as: Most of the time, blob Java objects implement the interface ManagedBlob, that provides the getKey() method. Blob Manager and Blob ProvidersĪt lower level, blobs are managed in the Nuxeo Platform by Blob Providers.

You can also have a look at the BlobAdapter pattern. Serializable value), of the documentModel object in the Java API. You can then use either the Document.SetBLob operation to set a blob on a given property or the setPropertyValue(String xpath, Which corresponds in Nuxeo Studio to selecting "Blob" in the type. When configuring this property, it has to be of type So a document can store multiple files that are standalone blob properties, or list of blob properties. The database has the notion of "Blob", that represents the binary stream and a set of metadata:Īt the Core level, blobs are bound to documents via a property of type BlobProperty. The content is stored as a binary stream, and the address of that content is stored in the database. On the Nuxeo Platform, the concept of file system doesn't exist.

It is a binary content managed under a file system, which means with a location (or locations if fragmented), a path and a name. A file is what is commonly handled on user's desktop or other file system.