Jackrabbit Oak - Standalone Application Example

This example demonstrates how to embed Oak in an standalone application

Getting Started

To get started build the build the latest sources with Maven 3 and Java 6 (or higher).

$ cd oak-examples/standalone
$ mvn clean install 

Once done you can run the application by executing

$ java -jar target/oak-standalone-*.jar

This would start an Oak based repository which uses filesystem storage. All the content would be by default stored under oak folder. The server would listen at port 8080 and support remote access via DavEx (at /server) and WebDAV (at /repository/default).

Now lets write something in the repository

$ curl --request MKCOL --data @- --user admin:admin \
       http://localhost:8080/server/default/jcr:root/hello/ <<END
<sv:node sv:name="hello" xmlns:sv="http://www.jcp.org/jcr/sv/1.0">
  <sv:property sv:name="message" sv:type="String">
    <sv:value>Hello, World!</sv:value>
  </sv:property>
  <sv:property sv:name="date" sv:type="Date">
    <sv:value>2009-11-17T12:00:00.000Z</sv:value>
  </sv:property>
</sv:node>
END

This would create a node hello at root.

$ curl --user admin:admin http://localhost:8080/server/default/jcr:root/hello.json

This should return a json rendition of the node. Application also has some other web interfaces which are linked at http://localhost:8080/

Scripting Repository

The application also has a Script Console at http://localhost:8080/osgi/system/console/sc which can be used to execute scripts like below

import javax.jcr.Repository
import javax.jcr.Session
import javax.jcr.SimpleCredentials
import javax.jcr.query.QueryResult
import javax.jcr.query.Row

def queryStr = '''select [jcr:path], [jcr:score], *
    from [oak:QueryIndexDefinition]
'''

Repository repo = osgi.getService(Repository.class)
Session s = null
try {
    s = repo.login(new SimpleCredentials("admin", "admin".toCharArray()))
    def qm = s.getWorkspace().getQueryManager()
    def query = qm.createQuery(queryStr,'sql')
    QueryResult result = query.execute()

    result.rows.each {Row r -> println r.path}
} finally {
    s?.logout()
}

Above script would dump path for all index definition nodes.

Using Mongo

By default the application uses SegmentMk for which stores the data on filesystem. Instead of that it can be configured to use Mongo

$ java -jar target/oak-standalone-*.jar --mongo

It would try to connect to a Mongo server at localhost and 27017 port. One can specify the server detail also

$ java -jar target/oak-standalone-*.jar --mongo=mongodb://server:27017

Application Structure

Oak uses a repository home (defaults to oak) folder in current directory.

oak/
├── bundles
├── dav
│   └── tmp
├── repository
│   ├── datastore
│   ├── index
│   └── segmentstore
│       ├── data00000a.tar
│       ├── journal.log
│       └── repo.lock
├── repository-config.json
└── segmentmk-config.json

In above structure

1. bundles - Storage used by OSGi bundles
2. repository - All content is stored here. Binary content is stored in datastore directory and node content is stored in segmentstore directory
3. json file - These are config files which are used to configure the repository components like JAAS setup, SegmentStore config etc. These are OSGi config. To see what all config options are supported go to http://localhost:8080/osgi/system/console/configMgr

The default setup is configured to use a FileDataStore to store binary content for both SegmentMk and MongoMk

Setup

Repository is configured and setup in RepositoryInitializer. On startup it would check if repository home exist or not. If not it would copy a set of default config files depending on options provided (like --mongo ) and then construct the Oak Repository instance via OakOSGiRepositoryFactory

private Repository createRepository(List<String> repoConfigs, File repoHomeDir) throws RepositoryException {
    Map<String,Object> config = Maps.newHashMap();
    config.put(OakOSGiRepositoryFactory.REPOSITORY_HOME, repoHomeDir.getAbsolutePath());
    config.put(OakOSGiRepositoryFactory.REPOSITORY_CONFIG_FILE, commaSepFilePaths(repoConfigs));
    config.put(OakOSGiRepositoryFactory.REPOSITORY_SHUTDOWN_ON_TIMEOUT, false);
    config.put(OakOSGiRepositoryFactory.REPOSITORY_ENV_SPRING_BOOT, true);
    config.put(OakOSGiRepositoryFactory.REPOSITORY_TIMEOUT_IN_SECS, 10);

    //Set of properties used to perform property substitution in
    //OSGi configs
    config.put("repo.home", repoHomeDir.getAbsolutePath());
    config.put("oak.mongo.db", mongoDbName);
    config.put("oak.mongo.uri", getMongoURI());

    //Configures BundleActivator to get notified of
    //OSGi startup and shutdown
    configureActivator(config);

    return new OakOSGiRepositoryFactory().getRepository(config);
}

In above setup

1. REPOSITORY_HOME - Path to the directory which would be used to store repository content
2. REPOSITORY_CONFIG_FILE - Comma separated json config file paths

Standalone Application is based on Spring Boot and thus supports all features provided by it.