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ModeShape provides a pair of ways to connect from remote clients: a WebDAV interface and a RESTful interface. This chapter details the capabilities of both as well as the configuration required to use each.
Although the WebDAV and REST servers are treated separately here, many of the configuration parameters are the same. This is because both share a fair amount of common code and have been designed to be able to be deployed simultaneously on the same server or even within the same web archive.
ModeShape provides a WebDAV server interface to its JCR implementation to ease integration with client applications.
The WebDAV server maps some of the content nodes (by default, nodes with a primary type of nt:file
) to
WebDAV resources and the other nodes to WebDAV folders. This allows any WebDAV client to navigate through the
content repository to store files in a given location, as well as to create or delete nodes in the repository.
The remainder of this section describes how to configure and deploy the WebDAV server.
The ModeShape WebDAV server is deployed as a WAR and configured mostly through its web configuration file (web.xml). Here is an example web configuration that is used for integration testing of the ModeShape WebDAV server along with an explanation of its parts.
<?xml version="1.0"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<display-name>ModeShape JCR RESTful Interface</display-name>
This first section is largely boilerplate and should look familiar to anyone who has deployed a servlet-based application before. The display-name can be customized, of course.
The next stanza configures the repository provider.
<!--
This parameter provides the fully-qualified name of a class that implements
the o.m.web.jcr.spi.RepositoryProvider interface. It is required
by the ModeShapeJcrDeployer that controls the lifecycle for the ModeShape WebDAV server.
-->
<context-param>
<param-name>org.modeshape.web.jcr.REPOSITORY_PROVIDER</param-name>
<param-value>org.modeshape.web.jcr.spi.ModeShapeJcrRepositoryProvider</param-value>
</context-param>
As noted above, this parameter informs the ModeShapeJcrDeployer
of the specific repository provider in use.
Unless you are using the ModeShape WebDAV server to connect to a different JCR implementation, this should
never change. The ModeShape REST server also uses the ModeShapeJcrDeployer
to get access to the JCR
repository, so the two servlets can be deployed in the same WAR.
Next we configure the ModeShape JcrEngine
itself.
<!--
This parameter, specific to the ModeShapeJcrRepositoryProvider implementation, specifies
the name of the configuration file to initialize the repository or repositories.
This configuration file must be on the classpath and is given as a classpath-relative
directory.
-->
<context-param>
<param-name>org.modeshape.web.jcr.CONFIG_FILE</param-name>
<param-value>/configRepository.xml</param-value>
</context-param>
If you are not familiar with the file format for a JcrEngine
configuration file, you can build one
programatically with the JcrConfiguration
class and call save(...)
instead of build()
to output the configuration file that equates to the configuration.
This is followed by some additional WebDAV configuration that controls the mapping between JCR node types and WebDAV files and resources. You can omit this section entirely to use the default values.
<!--
Nodes with any of the primary node types in this comma-delimited list will be treated by the
WebDAV implementation as content nodes. The value below is the default value for this
parameter. That is, if this init parameter is omitted, the value below will be used by default.
-->
<context-param>
<param-name>org.modeshape.web.jcr.webdav.CONTENT_PRIMARY_TYPE_NAMES</param-name>
<param-value>nt:resource, mode:resource</param-value>
</context-param>
<!--
Nodes with any of the primary node types in this comma-delimited list will be treated by the
WebDAV implementation as resource (file) nodes. The value below is the default value for this
parameter. That is, if this init parameter is omitted, the value below will be used by default.
-->
<context-param>
<param-name>org.modeshape.web.jcr.webdav.RESOURCE_PRIMARY_TYPE_NAMES</param-name>
<param-value>nt:file</param-value>
</context-param>
<!--
Each folder created through the WebDAV servlet will be created as a node with the primary node
type below. The value below is the default value for this parameter. That is, if this init
parameter is omitted, the value below will be used by default.
-->
<context-param>
<param-name>org.modeshape.web.jcr.webdav.NEW_FOLDER_PRIMARY_TYPE_NAME</param-name>
<param-value>nt:folder</param-value>
</context-param>
<!--
Each resource (file created through the WebDAV servlet will be created as a node with the primary
node type below. The value below is the default value for this parameter. That is, if this init
parameter is omitted, the value below will be used by default.
-->
<context-param>
<param-name>
org.modeshape.web.jcr.webdav.NEW_RESOURCE_PRIMARY_TYPE_NAME
</param-name>
<param-value>nt:file</param-value>
</context-param>
<!--
Content created through the WebDAV servlet will be created as a node with the primary node
type below. The value below is the default value for this parameter. That is, if this init
parameter is omitted, the value below will be used by default.
-->
<context-param>
<param-name>
org.modeshape.web.jcr.webdav.NEW_CONTENT_PRIMARY_TYPE_NAME
</param-name>
<param-value>mode:resource</param-value>
</context-param>
In general, this part of the web configuration file should not be modified.
Next, the RequestResolver
must be configured. The RequestResolver
converts the incoming
URI into a repository name, workspace name, and path within the repository. It is possible
(and easy) to develop a custom implementation of this interface, but a default resolver is
provided that maps all URIs directly into a repository and workspace.
<!--
This optional parameter provides the name of the o.m.w.j.webdav.RequestResolver
implementation class. The provided value must be the name of a class that
implements the RequestResolver interface and has a public, no-arg constructor.
If no value is provided, o.m.w.j.webdav.DefaultRequestResolver will be used.
-->
<context-param>
<param-name>org.modeshape.web.jcr.webdav.REQUEST_RESOLVER_CLASS_NAME</param-name>
<param-value>org.modeshape.web.jcr.webdav.DefaultRequestResolver</param-value>
</context-param>
<!--
This parameter is required if (and only if) the DefaultRequestResolver is used.
It provides the name of the JCR repository that will be accessed. An exception
will be thrown if no value is provided for this parameter.
-->
<context-param>
<param-name>
org.modeshape.web.jcr.webdav.DEFAULT_RESOLVER_REPOSITORY_NAME
</param-name>
<param-value>mode:repository</param-value>
</context-param>
<!--
This parameter is required if (and only if) the DefaultRequestResolver is used.
It provides the name of the JCR workspace that will be accessed. An exception
will be thrown if no value is provided for this parameter.
-->
<context-param>
<param-name>
org.modeshape.web.jcr.webdav.DEFAULT_RESOLVER_WORKSPACE_NAME
</param-name>
<param-value>default</param-value>
</context-param>
Another brief section of boilerplate ensues.
<!-- Required parameter for ModeShape WebDAV - should not be modified -->
<listener>
<listener-class>org.modeshape.web.jcr.ModeShapeJcrDeployer</listener-class>
</listener>
<!-- Required WebDAV servlet - should not be modified -->
<servlet>
<servlet-name>WebDAV</servlet-name>
<servlet-class>org.modeshape.web.jcr.webdav.ModeShapeWebdavServlet</servlet-class>
<!--
The webdav library requires this parameter to be present, but does not use it.
-->
<init-param>
<param-name>rootpath</param-name>
<param-value>.</param-value>
</init-param>
</servlet>
<!-- Required parameter for ModeShape WebDAV - should not be modified -->
<servlet-mapping>
<servlet-name>WebDAV</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
Finally, security must be configured for the WebDAV server.
<!--
The ModeShape WebDAV implementation leverages the HTTP credentials to for authentication
and authorization within the JCR repository. Unless the repository provides for anonymous
access, it makes no sense to try to log into the JCR repository without credentials, so
this constraint helps lock down the repository.
This should generally not be modified.
-->
<security-constraint>
<display-name>ModeShape WebDAV</display-name>
<web-resource-collection>
<web-resource-name>WebDAV</web-resource-name>
<url-pattern>/*</url-pattern>
</web-resource-collection>
<auth-constraint>
<!--
A user must be assigned this role to connect to any JCR repository, in addition to
needing the READONLY or READWRITE roles to actually read or modify the data. This
is not used internally, so another role could be substituted here.
-->
<role-name>connect</role-name>
</auth-constraint>
</security-constraint>
<!--
Any auth-method will work for ModeShape. BASIC is used this example for simplicity.
-->
<login-config>
<auth-method>BASIC</auth-method>
</login-config>
<!--
This must match the role-name in the auth-constraint above.
-->
<security-role>
<role-name>connect</role-name>
</security-role>
</web-app>
As noted above, the WebDAV server will not function properly unless security is configured. All authorization methods supported by the Servlet specification are supported by ModeShape and can be used interchangeable, as long as authenticated users have the connect role listed above.
Deploying the ModeShape WebDAV server only requires three steps: preparing the web configuration, configuring the users and their roles in your web container (outside the scope of this document), and assembling the WAR. This section describes the requirements for assembling the WAR.
If you are using Maven to build your projects, the WAR can be built from a POM. Here is a portion of the POM used to build the ModeShape WebDAV Server integration subproject.
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<artifactId>modeshape</artifactId>
<groupId>org.modeshape</groupId>
<version>1.1</version>
<relativePath>../..</relativePath>
</parent>
<artifactId>modeshape-web-jcr-webdav-war</artifactId>
<packaging>war</packaging>
<name>ModeShape JCR WebDAV Servlet</name>
<description>ModeShape servlet that provides WebDAV access to JCR items</description>
<url>http://www.modeshape.org</url>
<dependencies>
<dependency>
<groupId>org.modeshape</groupId>
<artifactId>modeshape-web-jcr-webdav</artifactId>
<version>${project.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.5.8</version>
<scope>runtime</scope>
</dependency>
</dependencies>
</project>
If you use this approach, make sure that web configuration file is in the /src/main/webapp/WEB-INF
directory.
Of course, the JBoss WebDAV Server WAR can still be built if you are not using Maven. Simply construct a WAR with the following contents:
+ /WEB-INF + /classes | + configRepository.xml | + log4j.properties (Optional) + /lib | + activation-1.1.jar | + aperture-1.1.0.Beta1.jar | + google-collections-1.0.jar | + hamcrest-core-1.1.jar | + jakarta-regexp-1.4.jar | + jaxb-api-2.1.jar | + jaxb-impl-2.1.12.jar | + jcip-annotations-1.0.jar | + jcr-1.0.1.jar | + joda-time-1.6.jar | + junit-dep-4.4.jar | + lucene-analyzers-3.0.0.jar | + lucene-core-3.0.0.jar | + lucene-regex-3.0.0.jar | + lucene-snowball-3.0.0.jar | + modeshape-cnd-1.1.jar | + modeshape-common-1.1.jar | + modeshape-graph-1.1.jar | + modeshape-jcr-1.1.jar | + modeshape-mimetype-detector-aperture-1.1.jar | + modeshape-repository-1.1.jar | + modeshape-search-lucene-1.1.jar | + modeshape-web-jcr-1.1.jar | + modeshape-web-jcr-webdav-1.1.jar | + rdf2go.api-4.6.2.jar | + slf4j-api-1.5.8.jar | + slf4j-log4j12-1.5.8.jar | + stax-api-1.0-2.jar | + webdav-servlet-2.0.jar + web.xml
If you are using sequencers or any connectors other than the in-memory or federated connector, you will also have
to add the JARs for those dependencies into the WEB-INF/lib
directory as well. You will also have to
change the version numbers on the JARs to reflect the current version of ModeShape.
This WAR can be deployed into your servlet container.
ModeShape provides a RESTful interface to its JCR implementation that allows HTTP-based access and updating of content. Although the initial version of this REST server only supports the ModeShape JCR implementation, it has been designed to make integration with other JCR implementors easy. This section describes how to configure and deploy the REST server.
The REST Server currently supports the URIs and HTTP methods described below. The URI patterns assume that the REST server is deployed at its conventional location of "/resources". These URI patterns would change if the REST server were deployed under a different web context and URI patterns below would change accordingly. Currently, only JSON-encoded responses are provided.
Table 11.1. Supported URIs for the ModeShape REST Server
URI Pattern | HTTP Method(s) | HTTP Description |
---|---|---|
/resources | Returns a list of accessible repositories | GET |
/resources/{repositoryName} | Returns a list of accessible workspaces within that repository | GET |
/resources/{repositoryName}/{workspaceName} | Returns a list of available operations within the workspace | GET |
/resources/{repositoryName}/{workspaceName}/item/{path} | Accesses the item (node or property) at the path | ALL |
Note that this approach supports dynamic discovery of the available repositories on the server. A typical conversation might start with a request to the server to check the available repositories.
GET http://www.example.com/resources
This request would generate a response that mapped the names of the available repositories to metadata information about the repositories like so:
{ "modeshape%3arepository" : { "repository" : { "name" : "modeshape%3arepository", "resources" : { "workspaces":"/resources/modeshape%3arepository" } } } }
The actual response wouldn't be pretty-printed like the example, but the format would be the same. The name of the repository ("mode:repository" URL-encoded) is mapped to a repository object that contains a name (the redundant "mode:repository") and a list of available resources within the repository and their respective URIs. Note that ModeShape supports deploying multiple JCR repositories side-by-side on the same server, so this response could easily contain multiple repositories in a real deployment.
The only thing that you can do with a repository through the REST interface at this time is to get a list of its workspaces. A request to do so can be built up from the previous response like this:
GET http://www.example.com/resources/modeshape%3arepository
This request (and all of the following requests) actually create a JCR Session to service the request and require that security be configured. This process is described in more detail in a later section. Assuming that security has been properly configured, the response would look something like this:
{ "default" : { "workspace" : { "name" : "default", "resources" : { "items":"/resources/modeshape%3arepository/default/items" } } } }
Like the first response, this response consists of a list of workspace names mapped to metadata about the workspaces. The example above only lists one workspace for simplicity, but there could be many different workspaces returned in a real deployment. Note that the "items" resource builds the full URI to the root of the items hierarchy, including the encoding of the repository name and the workspace name.
Now a request can be built to retrieve the root item of the repository.
GET http://www.example.com/resources/modeshape%3arepository/default/items
Any other item in the repository could be accessed by appending its path to the URI above. In a default repository with no content, this would return the following response:
{ "properties": { "jcr:primaryType": "mode:root", "jcr:uuid": "97d7e2ef-996e-4d99-8ec2-dc623e6c2239" }, "children": ["jcr:system"]
The response contains a mapping of property names to their values and an array of child names. Had one of the properties been multi-valued, the values for that property would have been provided as an array as well, as will shortly be shown.
The items resource also contains an option query parameter: mode:depth
. This parameter, which defaults
to 1, controls how deep the hierarchy of returned nodes should be. Had the request had the parameter:
GET http://www.example.com/resources/modeshape%3arepository/default/items?mode:depth=2
Then the response would have contained details for the children of the root node as well.
{ "properties": { "jcr:primaryType": "mode:root", "jcr:uuid": "163bc5e5-3b57-4e63-b2ae-ededf43d3445" }, "children": { "jcr:system": { "properties": {"jcr:primaryType": "mode:system"}, "children": ["mode:namespaces"] } } }
It is also possible to use the RESTful API to add, modify and remove repository content. Removes are simple - a DELETE request with no body returns a response with no body.
DELETE http://www.example.com/resources/modeshape%3arepository/default/items/path/to/deletedNode
Adding content simply requires a POST to the name of the relative root node of the content that you wish to add and a request body in the same format as the response from a GET. Adding multiple nodes at once is supported, as shown below.
POST http://www.example.com/resources/modeshape%3arepository/default/items/newNode { "properties": { "jcr:primaryType": "nt:unstructured", "jcr:mixinTypes": "mix:referenceable", "someProperty": "foo" }, "children": { "newChildNode": { "properties": {"jcr:primaryType": "nt:unstructured"} } } }
Note that protected properties like jcr:uuid are not provided but that the primary type and mixin types are provided as properties. The REST server will translate these into the appropriate calls behind the scenes. The response from the request will be empty by convention.
The PUT method allows for updates of nodes and properties. If the URI points to a property, the body of the request should be the new JSON-encoded value for the property, which includes the property name (allowing proper determination of whether the values are binary; see the next section"").
PUT http://www.example.com/resources/modeshape%3arepository/default/items/newNode/someProperty { "someProperty" : "bar" }
Setting multiple properties at once can be performed by providing a URI to a node instead of a property. The body of the request should then be a JSON object that maps property names to their new values.
PUT http://www.example.com/resources/modeshape%3arepository/default/items/newNode { "someProperty": "foobar", "someOtherProperty": "newValue" }
The PUT method doesn't currently support adding or removing mixin types. This will be corrected in the future. A JIRA issue has been created to help track this issue.
Binary property values are included in any of the the responses or requests, but are represented string values containing the Base 64 encoding of the binary content. Any such property is explicitly annotated such that "/base64/" is appended to the property name. First of all, this makes it very clear to the client and service which properties are encoded, allowing them to properly decode the values before use. Secondly, the "/base64/" suffix was carefully chosen because it cannot be used in a real property name (without escaping). Here's an example of a node containing a "jcr:primaryType" property with a single string value, a "jcr:uuid" property with another single UUID value, another "options" property that has two integer values, and a fourth "content" property that has a single binary value:
{ "properties": { "jcr:primaryType": "nt:unstructured", "jcr:uuid": "163bc5e5-3b57-4e63-b2ae-ededf43d3445" "options": [ "1", "2" ] "content/base64/": "TWFuIGlzIGRpc3Rpbmd1aXNoZWQsIG5vdCBvbmx5IGJ5IGhpcyByZWFzb24sIGJ1dCBieSB0aGlz IHNpbmd1bGFyIHBhc3Npb24gZnJvbSBvdGhlciBhbmltYWxzLCB3aGljaCBpcyBhIGx1c3Qgb2Yg dGhlIG1pbmQsIHRoYXQgYnkgYSBwZXJzZXZlcmFuY2Ugb2YgZGVsaWdodCBpbiB0aGUgY29udGlu dWVkIGFuZCBpbmRlZmF0aWdhYmxlIGdlbmVyYXRpb24gb2Yga25vd2xlZGdlLCBleGNlZWRzIHRo ZSBzaG9ydCB2ZWhlbWVuY2Ugb2YgYW55IGNhcm5hbCBwbGVhc3VyZS4=" }, }
All values of a property will always be Base 64 encoded if at least one of the values is binary. If there are multiple values, then they will be separated by commas and will appear within '[' and ']' characters (just like other properties).
The ModeShape REST server is deployed as a WAR and configured mostly through its web configuration file (web.xml). Here is an example web configuration that is used for integration testing of the ModeShape REST server along with an explanation of its parts.
<?xml version="1.0"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<display-name>ModeShape JCR RESTful Interface</display-name>
This first section is largely boilerplate and should look familiar to anyone who has deployed a servlet-based application before. The display-name can be customized, of course.
The next stanza configures the repository provider.
<!--
This parameter provides the fully-qualified name of a class that implements
the o.m.web.jcr.spi.RepositoryProvider interface. It is required
by the ModeShapeJcrDeployer that controls the lifecycle for the ModeShape REST server.
-->
<context-param>
<param-name>org.modeshape.web.jcr.REPOSITORY_PROVIDER</param-name>
<param-value>org.modeshape.web.jcr.spi.ModeShapeJcrRepositoryProvider</param-value>
</context-param>
As noted above, this parameter informs the ModeShapeJcrDeployer
of the specific repository provider in use.
Unless you are using the ModeShape REST server to connect to a different JCR implementation, this should
never change.
Next we configure the ModeShape JcrEngine
itself.
<!--
This parameter, specific to the ModeShapeJcrRepositoryProvider implementation, specifies
the name of the configuration file to initialize the repository or repositories.
This configuration file must be on the classpath and is given as a classpath-relative
directory.
-->
<context-param>
<param-name>org.modeshape.web.jcr.CONFIG_FILE</param-name>
<param-value>/configRepository.xml</param-value>
</context-param>
If you are not familiar with the file format for a JcrEngine
configuration file, you can build one
programatically with the JcrConfiguration
class and call save(...)
instead of build()
to output the configuration file that equates to the configuration.
This is followed by a bit of RESTEasy and JAX-RS boilerplate.
<!--
This parameter defines the JAX-RS application class, which is really just a metadata class
that lets the JAX-RS engine (RESTEasy in this case) know which classes implement pieces
of the JAX-RS specification like exception handling and resource serving.
This should not be modified.
-->
<context-param>
<param-name>javax.ws.rs.Application</param-name>
<param-value>org.modeshape.web.jcr.rest.JcrApplication</param-value>
</context-param>
<!-- Required parameter for RESTEasy - should not be modified -->
<listener>
<listener-class>org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap</listener-class>
</listener>
<!-- Required parameter for ModeShape REST - should not be modified -->
<listener>
<listener-class>org.modeshape.web.jcr.ModeShapeJcrDeployer</listener-class>
</listener>
<!-- Required parameter for RESTEasy - should not be modified -->
<servlet>
<servlet-name>Resteasy</servlet-name>
<servlet-class>org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher</servlet-class>
</servlet>
<!-- Required parameter for ModeShape REST - should not be modified -->
<servlet-mapping>
<servlet-name>Resteasy</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
In general, this part of the web configuration file should not be modified.
Finally, security must be configured for the REST server.
<!--
The ModeShape REST implementation leverages the HTTP credentials to for authentication and
authorization within the JCR repository. It makes no sense to try to log into the JCR
repository without credentials, so this constraint helps lock down the repository.
This should generally not be modified.
-->
<security-constraint>
<display-name>ModeShape REST</display-name>
<web-resource-collection>
<web-resource-name>RestEasy</web-resource-name>
<url-pattern>/*</url-pattern>
</web-resource-collection>
<auth-constraint>
<!--
A user must be assigned this role to connect to any JCR repository, in addition to needing the
READONLY or READWRITE roles to actually read or modify the data. This is not used internally,
so another role could be substituted here.
-->
<role-name>connect</role-name>
</auth-constraint>
</security-constraint>
<!--
Any auth-method will work for ModeShape. BASIC is used this example for simplicity.
-->
<login-config>
<auth-method>BASIC</auth-method>
</login-config>
<!--
This must match the role-name in the auth-constraint above.
-->
<security-role>
<role-name>connect</role-name>
</security-role>
</web-app>
As noted above, the REST server will not function properly unless security is configured. All authorization methods supported by the Servlet specification are supported by ModeShape and can be used interchangeable, as long as authenticated users have the connect role listed above.
Just as with the ModeShape WebDAV server, deploying the ModeShape REST server only requires three steps: preparing the web configuration, configuring the users and their roles in your web container (outside the scope of this document), and assembling the WAR. This section describes the requirements for assembling the WAR.
If you are using Maven to build your projects, the WAR can be built from a POM. Here is a portion of the POM used to build the ModeShape REST Server integration subproject.
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<artifactId>modeshape</artifactId>
<groupId>org.modeshape</groupId>
<version>1.1</version>
<relativePath>../..</relativePath>
</parent>
<artifactId>modeshape-web-jcr-rest-war</artifactId>
<packaging>war</packaging>
<name>ModeShape JCR REST Servlet</name>
<description>ModeShape servlet that provides RESTful access to JCR items</description>
<url>http://www.modeshape.org</url>
<dependencies>
<dependency>
<groupId>org.modeshape</groupId>
<artifactId>modeshape-web-jcr-rest</artifactId>
<version>1.1</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.5.8</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-client</artifactId>
<version>1.1.GA</version>
</dependency>
</dependencies>
</project>
If you use this approach, make sure that web configuration file is in the /src/main/webapp/WEB-INF
directory.
The JBoss REST Server WAR is still easy enough to build if you are not using Maven. Simply construct a WAR with the following contents:
+ /WEB-INF + /classes | + configRepository.xml | + log4j.properties (Optional) + /lib | + activation-1.1.jar | + commons-codec-1.2.jar | + commons-httpclient-3.1.jar | + google-collections-1.0.jar | + hamcrest-core-1.1.jar | + httpclient-4.0.jar | + httpcore-4.0.1.jar | + jakarta-regexp-1.4.jar | + javassist-3.6.0.GA.jar | + jaxb-api-2.1.jar | + jaxb-impl-2.1.12.jar | + jaxrs-api-1.2.1.GA.jar | + jcip-annotations-1.0.jar | + jcl-over-slf4j-1.5.8.jar | + jcr-1.0.1.jar | + jettison-1.1.jar | + joda-time-1.6.jar | + jsr250-api-1.0.jar | + junit-dep-4.4.jar | + lucene-analyzers-3.0.0.jar | + lucene-core-3.0.0.jar | + lucene-regex-3.0.0.jar | + lucene-snowball-3.0.0.jar | + modeshape-cnd-1.1.jar | + modeshape-common-1.1.jar | + modeshape-graph-1.1.jar | + modeshape-jcr-1.1.jar | + modeshape-repository-1.1.jar | + modeshape-search-lucene-1.1.jar | + modeshape-web-jcr-1.1.jar | + modeshape-web-jcr-rest-1.1.jar | + resteasy-jaxb-provider-1.2.1.GA.jar | + resteasy-jaxrs-1.2.1.GA.jar | + resteasy-jettison-provider-1.2.1.GA.jar | + scannotation-1.0.2.jar | + sjsxp-1.0.1.jar | + slf4j-api-1.5.8.jar | + slf4j-log4j12-1.5.8.jar | + slf4j-simple-1.5.8.jar | + stax-api-1.0-2.jar + web.xml
If you are using sequencers or any connectors other than the in-memory or federated connector, you will also have
to add the JARs for those dependencies into the WEB-INF/lib
directory as well. You will also have to
change the version numbers on the JARs to reflect the current version of ModeShape.
This WAR can be deployed into your servlet container.
The ModeShape REST Client API provides a POJO way of using the ModeShape REST web service to publish (upload) and
unpublish (delete) files from ModeShape repositories. Java objects open the HTTP connection, create the HTTP request URLs,
attach the payload associated with PUT
and POST
requests, parse the HTTP JSON response back
into Java objects, and close the HTTP connection.
Here are the Java business objects you will need (all found in the org.modeshape.web.jcr.rest.client.domain
package):
Server
- hosts one or more ModeShape JCR repositories,
Repository
- a ModeShape JCR repository containing one or more workspaces, and
Workspace
- a ModeShape JCR repository workspace.
Along with the POJOs above, an org.modeshape.web.jcr.rest.client.IRestClient
is needed. The
IRestClient
is responsible for executing the publishing and unpublishing operations. You can also use the
IRestClient
to find out what repositories and workspaces are available on a ModeShape server.
The only implementation of IRestClient
is JsonRestClient
as JSON-encoded responses are
all that are currently available.
Here's a code snippet that publishes (uploads) a file:
// Setup POJOs Server server = new Server("http://localhost:8080", "username", "password"); Repository repository = new Repository("repositoryName", server); Workspace workspace = new Workspace("workspaceName", repository); // Publish File file = new File("/path/to/file"); IRestClient restClient = new JsonRestClient(); Status status = restClient.publish(workspace, "/workspace/path/", file); if (status.isError() { // Handle error here }
Successfully executing the above code results in the creation a JCR folder node (nt:folder
) for each segment of the
workspace path (if the folder didn't already exist). Also, a JCR file node (a node with primary type nt:file
) is
created or updated under the last folder node and the file contents are encoded and uploaded into a child node of that file node.
Both the ModeShape REST server and the ModeShape WebDAV server can also be used as an interface to to other JCR repositories by creating
an implementation of the RepositoryProvider
interface that connects to the other repository.
The RepositoryProvider
only has a few methods that must be implemented. When the ModeShapeJcrDeployer
starts
up, it will dynamically load the RepositoryProvider
implementation (as noted above) and call the
startup(ServletContext)
method on the provider. The provider can use this method to load any
required configuration parameters from the web configuration (web.xml) and initialize the repository.
As an example, here's the ModeShape JCR provider implementation of this method with exception handling omitted for brevity.
public void startup( ServletContext context ) { String configFile = context.getInitParameter(CONFIG_FILE); InputStream configFileInputStream = getClass().getResourceAsStream(configFile); jcrEngine = new JcrConfiguration().loadFrom(configFileInputStream).build(); jcrEngine.start(); }
As you can see, the name of configuration file for the JcrEngine
is read from the servlet context and used
to initialize the engine.
Once the repository has been started, it is now ready to accept the main methods that provide the interface
to the repository.
The first method returns the set of repository names supported by this repository.
public Set<String> getJcrRepositoryNames() { return new HashSet<String>(jcrEngine.getRepositoryNames()); }
The ModeShape JCR repository does support multiple repositories on the same server. Other JCR implementations that don't support multiple repositories are free to return a singleton set containing any string from this method.
The other required method returns an open JCR Session for the user from the current request in a given repository
and workspace. The provider can use the HttpServletRequest
to get the authentication credentials for the
HTTP user.
public Session getSession( HttpServletRequest request, String repositoryName, String workspaceName ) throws RepositoryException { Repository repository = getRepository(repositoryName); SecurityContext context = new ServletSecurityContext(request); Credentials credentials = new SecurityContextCredentials(context); return repository.login(credentials, workspaceName); }
The getSession(...)
method is used by most of the REST server methods to access the JCR
repository and return results as needed.
Finally, the shutdown()
method signals that the web context is being undeployed and the JCR
repository should shutdown and clean up any resources that are in use.
This chapter has described two ways to access a ModeShape JCR repository remotely through HTTP-based protocols. In the next chapter, the different repository connectors will be described so that you can start to use ModeShape to store new data, connect to existing data through JCR, or both.