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The camel serializer exists as a proof-of-concept serialization of resources within the repository. The intention is to have an eventually consistent copy of the repository content. In working to build lossless import/export functionality, the serialization format is used as a starting point.
Using the Camel Serializer
The Camel Serializer is automatically installed With the Fedora 4.6.0 release of the fcrepo-vagrant test application. Creating a sample of the output from the serializer can be done with the following steps:
- git clone https://github.com/fcrepo4-exts/fcrepo4-vagrant.git
- cd fcrepo4-vagrant
- vagrant up
- vagrant ssh
- (optional) sudo vi /opt/karaf/etc/org.fcrepo.camel.serialization.cfg
change line that says:
serialization.includeBinaries=false
to:
serialization.includeBinaries=true - In a web browser, go to http://localhost:8080/fcrepo/rest
- create a new container, and add a binary to that container
- cd /tmp/descriptions, to see the metadata that was saved by the serializer
- cd /tmp/binaries to see the binaries that were saved (assuming you set includeBinaries=true
Only content that is added or changed while the Serializer is running will be copied to /tmp/descriptions and /tmp/binaries.
Sample Output
vagrant@fedora4:/tmp$ tree descriptions/
descriptions/
├── albums
│ └── ea
│ └── 50
│ └── 12
│ └── 93
│ └── ea501293-64bf-430e-bf97-abcd64fda0c4.ttl
├── albums.ttl
└── fedora:system
├── fedora:transform
│ └── fedora:ldpath
│ ├── default
│ │ └── fedora:Resource.ttl
│ ├── default.ttl
│ ├── deluxe
│ │ └── fedora:Resource.ttl
│ └── deluxe.ttl
└── fedora:transform.ttl
vagrant@fedora4:/tmp$ tree binaries/
binaries/
├── albums
│ └── ea
│ └── 50
│ └── 12
│ └── 93
│ └── ea501293-64bf-430e-bf97-abcd64fda0c4
└── fedora:system
└── fedora:transform
└── fedora:ldpath
├── default
│ └── fedora:Resource
└── deluxe
└── fedora:Resource
vagrant@fedora4:/tmp/descriptions$ cat albums.ttl
@prefix premis: <http://www.loc.gov/premis/rdf/v1#> .
@prefix image: <http://www.modeshape.org/images/1.0> .
@prefix sv: <http://www.jcp.org/jcr/sv/1.0> .
@prefix test: <info:fedora/test/> .
@prefix nt: <http://www.jcp.org/jcr/nt/1.0> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xsi: <http://www.w3.org/2001/XMLSchema-instance> .
@prefix mode: <http://www.modeshape.org/1.0> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix fedora: <http://fedora.info/definitions/v4/repository#> .
@prefix xml: <http://www.w3.org/XML/1998/namespace> .
@prefix audit: <http://fedora.info/definitions/v4/audit#> .
@prefix jcr: <http://www.jcp.org/jcr/1.0> .
@prefix ebucore: <http://www.ebu.ch/metadata/ontologies/ebucore/ebucore#> .
@prefix ldp: <http://www.w3.org/ns/ldp#> .
@prefix xs: <http://www.w3.org/2001/XMLSchema> .
@prefix fedoraconfig: <http://fedora.info/definitions/v4/config#> .
@prefix mix: <http://www.jcp.org/jcr/mix/1.0> .
@prefix prov: <http://www.w3.org/ns/prov#> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix dc: <http://purl.org/dc/elements/1.1/> .
<http://localhost:8080/fcrepo/rest/albums> a fedora:Container , fedora:Resource ;
fedora:lastModifiedBy "bypassAdmin"^^<http://www.w3.org/2001/XMLSchema#string> ;
fedora:createdBy "bypassAdmin"^^<http://www.w3.org/2001/XMLSchema#string> ;
fedora:created "2016-09-06T15:15:55.666Z"^^<http://www.w3.org/2001/XMLSchema#dateTime> ;
fedora:lastModified "2016-09-06T15:16:34.844Z"^^<http://www.w3.org/2001/XMLSchema#dateTime> ;
a ldp:RDFSource , ldp:Container ;
fedora:writable "true"^^<http://www.w3.org/2001/XMLSchema#boolean> ;
fedora:hasParent <http://localhost:8080/fcrepo/rest/> ;
ldp:contains <http://localhost:8080/fcrepo/rest/albums/ea/50/12/93/ea501293-64bf-430e-bf97-abcd64fda0c4> .
RDF and Non-RDF
The serializer has the option of including or excluding content based on whether it's an RDF resource or a non-RDF resource. Furthermore, those two types of content can be segregated into configurable directories.
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