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We have introduced the new kernel for eXo Platform 2 as well as the brand new Portal features in the first part of this article. This second part will focus on the new products we are building and that will be available in such as:. Each of those products depends on the Platform one that we introduced in Part 1.

Therefore, even if reading the previous paper to understand that one may not be necessary, we highly advise you to have a quick glance at it.

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In that chapter we will have a quick overview of the JCR functionalities and we will also introduce the features supported by eXo JCR 1. For more information on JCR we invite you to directly read the specification that is very well written probably the best one we have read so far! The JCR specification normalizes the storing of data in an abstract way in order to hide to the user the type of backend that is used.

Of course JCR comes with higher levels of service such as versioning or locking but its main purpose is to enable read and write operations in a normalized way as well as the creation of structured contents. Those features are described in the two first levels of the specification. Our implementation supports all functionalities of level 1 and 2 as well as all the optional features except the JTA support at the time of this writing! You can find a summary table of the TCK results at the end of this section.

Note that all the functionalities such as template creation and management, scripting, publication, validation workflows and data transformation are out of the scope of the JCR specification and are part of the ECM product that we will describe in the next chapter.

As shown in the next image taken from the Reference Implementation documentationlevel 1 focuses on read functionalities, which includes XPath API for searchingas well as structured documents description thanks to NodeType Definition.

The main entry point to any JCR implementation is the Repository object. According to the implementation there can be several ways to lookup the object but the most usual way in standalone environments is to use a JNDI server such as in the following code:. With eXo JCR, it is also possible to leverage our service container and lookup the service or have it injected if your component is also located in the service container using the following Java code.

Using this way brings more flexibility. For more information on the PortalContainer please refer to the first article part.

Then, a user needs to login into the server in order to get a Session object. There are two main ways to log in, one by creating a Credential object such as:. Or if you run an implementation of eXo that is for example embed ded in the portalyou can then directly login using:. Single Sign On SSO products can now also be used as version 2 of the platform support s them natively.

The NodeType concept is probably the most complex to grasp but it is also the most powerful and useful one. The idea is to define a type that will describe the structure of the nodes that are of this type. This is almost the same type of relationship that there exist between a class and an instance apart that the NodeType can not contain business logic methods.

Each node that will be created and that will be of type exo: That, in this particular case, can be a property for the name, one for the summary, one for the article content and a collection of children that will contain the images or attachments. When a Node instance is created its NodeType is affected. There also exist s the concept of MixinType, which allows a Node to get more constraints on it according to what the MixinType defines.

If we use the same analogy, a MixinType is equivalent to an interface while a NodeType is equivalent to a class. Therefore, we could define the MixinType "exo: We will review them and how they are used in the next chapter.

Any application that supports JCR level 1 must also support the export functionality that can be quite useful for portability purposes, as any exported part of the content hierarchy will be exported as an XML document that can then be imported in any JCR level 2 compliant implementations. The following code is a sample of one of our ECM portlet that allows browsing any workspace. For each node we view, we can import or export the sub tree. The next code shows how simple it is to import some content we have uploaded.

The UIUpload component is a JSF one whose goal is to render an upload HTML field inside a multipart form and to extract and wrap the uploaded result so that we can simply get it with the method uiupload. The four properties are talkative enough and we will not describe them more. For searching purposes the specifications level 1 defines a Query mechanism that leverages the XPath syntax. Repository implementations can also support SQL syntax but that feature is non-mandatory.

To create a query one must first get the QueryManager from the Workspace object such as in the following code:. Then, we create a Query object by passing the previous statement and the query type, here Query. That can be useful for example within an ECM toolwhere an admin can define a set of complex preconfigured Queries that the normal user can directly use as preconfigured ones. The following code fragment stores the Query at the specified path. Once we have created the Query object we just have to execute it to get a QueryResult object in return and a call to getNodes method to obtain a NodeIterator as shown in the next code fragment:.

By clicking on the content linkyou can select a result and directly go to the corresponding node path in the explorer. Level 2 is mainly about write operations while level 1 was about read operations that can be seen as export functionalities. It also introduces the notion of access control with 4 permissions add node, remove node, read node, set property and some security methods.

The next image shows the security screen in the JCR browser portlet where you can view all the permissions that are applied to a node. If you wish to add permissions and if you have the right to do so, you will be redirected to the following form, which lets you select your user or group and the permissions to apply. Therefore, it is possible to bind a node with a user or a group of users that have the same membership in a group.

The other methods and returned objects are talkative. So if you use eXo implementation a simple cast to that interface will allow you to use those methods. What we call level 3 is in fact all the functionalities that are not mandatory in level 1 or 2.

That includes some important features such as locking and versioning but also a normalized Observation model. The Observation model is an important one especially in the ECM context where content need to be stored but also managed, moved, transformed…Our validation workflow process in our ECM product is for example based on that mechanism but we will describe the more generic concept of document Actions in the next section.

The Observation allows you to register listener objects that for example can be executed when nodes of certain types are added at a specified location. As defined in the Event interface there are 5 types of events that can be fired by observation mechanism:. That manipulation is done thanks to the ObservationListener object as shown in the next code fragment:. Its goals are to manage a graph of versions to enable the restore of previous versions, the creation of branches as well as their merge.

The first time a node is made versionable, it gets automatically the status of a checked out node. Any modification on that node will be made persistent when the changes are saved and when the node is checked in. Another version object will then be created. In the next screen we see green arrow that the PDF document invoice3. If the node itself is not versionable but if one of its ancestors is and if that one is checked in, then no write modification will be allowed on the child node.

To allow write changes, one will first have to checkout the ancestor node. The version number name works in our implementation like the SVN ones. It is possible to restore, view or even compare different versions of a node that has the type nt: All the information of a version is accessible through the VersionHistory object binded to a versioned node.

Getting that objects is trivial. Then you can lookup the version you wish thanks to several methods such as the getRootVersion or the getBaseVersion.

Each version history object contains all the Versions of the Node strictly speaking of the set of corresponding Nodes and each Version object has a pointer to its predecessor or its successor and contains the frozen Node state. That way it builds a graph of versions as seen in the next image taken from the specification itself. Locking a node allows you to make it only modifiable by you, usually for the time of your session.

As for versions methods, making a Node lockable is done through the use of a dedicated MixinType. In our example which is also the default implementation for locking in our ECM portletsthe node lock is deep and session scoped, in other words no modification on the children are allowed for the time of the user session.

When the session expires, the lock is disabled. Our implementation can be configured to use several repositories and each repository according to specification can have several workspaces. Each repository may have one or more workspaces, which will contain specific data container and other components for data access. Note that each repository should have one system workspace to store some system data like version storage, nodetypes and namespaces. Components that need to be configured are exposed in exo-jcr-config.

This workspace has relational database based backend of type. JSR does not specify mechanism for node type registration so we added registration mechanisms exposed in ExtendedNodeTypeManager interface that extends standard NodeTypeManager. It allows to register node type using dedicated Java class, object and also special type of bean called NodeTypeValue that can be used in dynamic registration or thanks to a declarative way using an XML Input stream.

Java Content Repository API offers a fa cade for accessing data regardless of data storing mechanism. It can be for instance local or remote file system, relational database, XML native database etc.

Our implementation offers simple internal API to plug any type of backend. The main components to do so are the WorkspaceDataContainer — an abstraction object for wrapping data source - and data storing components NodeData and PropertyData.

Implementing these interfaces eXo JCR can be extended with other type of data storage. All you need to point workspace to use specific data container is set container type and some container specific parameters if necessary like in example above:. For the time being eXo platform has two type of Hibernate based data containers see org.

It is possible to add, remove documents or set of documents from a path on the server. The DeltaV protocol is an extension of WebDAV that allows to also manag e document versioning that we will support in the future.

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This is part three of a trilogy on Bonita v2. Be sure to read part one and part two. In the two previous articles of the Bonita trilogy, Miguel and Jordi discussed many intrinsic topics of Bonita Workflow engine. This follow-up article steps back and deals with the application layer.

Indeed it demonstrates a possible way to couple a Workflow Engine and a Portal. More precisely, Bonita and eXo have been selected by way of implementation. The article shows how workflow processes can be deployed, managed and monitored through JSR Portlets.

It also shows how Bonita workflow engine can be leveraged to validate documents contained in the eXo Java Content Repository. We hope ideas presented here can be applied to different integration scenarios. You forgot to provide an Email Address. This email address is already registered. You have exceeded the maximum character limit. Please provide a Corporate E-mail Address. By submitting your personal information, you agree that TechTarget and its partners may contact you regarding relevant content, products and special offers.

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The first section introduces key concepts. Then we will have a look at the way both components can be integrated, and finally we will study some use cases. Then we will see the advantages offered by their integration. A Portal is a Web application providing unique and customized access to resources of the organization, such as applications, people, documents, and business processes. Java building blocks of Portals are called Portlets.

Portlets can be considered as specialized areas in the Web browser acting as a negotiator between users and information systems. Portlets are used in many fields like enterprise content management, groupware, business intelligence, monitoring, or online forms. The following screenshot illustrates a groupware portlet:. More precisely this is the eXo Calendar Portlet.

It enables the management and sharing of the user timetable. Portlets are laid out in the Web browser to form a kind of patchwork called a Portal Page. By grouping different portlets in the same page, it is possible to provide the user with a control panel to manage his business. This in turn can be compared with multitasking operating systems, which allow interfacing with many applications at once. Portals are flexible in the sense that they allow customization and personalization.

Customization enables the user to tune his or her portal. For example, a user might specify those categories of information he or she wishes to access from personal pages.

As a supplement, personalization allows content to be automatically tailored, based on the user profile. For example, a monitoring portlet might determine which business processes a user is involved in and render an appropriate synthetic view. So portals help to increase users' productivity.

Developers are not left out. Features like security, rendering, profiling, mobility, internationalization and accessibility are handled by the portal infrastructure. This enables developers to focus on the added value, without reinventing the wheel. System Integrators also join the party. Portals provide a single sign in to access all integrated applications by authenticating once.

Portals are within the reach of customers, employees or business partners. S, we think that Portals are a perfect interface with the components of an SOA platform.

Within these products, eXo ECM also provides a Portal infrastructure to capture, store, manage, publish and backup documents. The second module in the stack is the workflow engine. A workflow engine, sometimes referred as a BPM Business Process Management engine, is a software component that breaks a work process down into tasks.

A basic example of such a process is an approval workflow process, in which an employee needs a manager's permission before running an application. A workflow engine provides an infrastructure to model this workflow, execute it, assign the tasks to its participants , and monitor it. To achieve the desired results, it may interact with humans or machines through, for example, Web services.

This enables integration with platforms different from Java, like mainframes or. Bonita is one of the workflow engines gaining great momentum over the past year. This also implies that Bonita runs in an Application Server and benefits from built-in services such as transactions, security, connectivity, presentation, clustering, and high availability.

As often in J2EE, there is no need to reinvent the wheel. We utilize this new feature deploying processes in eXo. Figure 2 ProED example: First, many organizations express the need to run a flexible and unique solution to interface with their back office. This solution includes business processes. On one side, as we have seen, we have eXo which is skilled at presentation, personalization and integration.

On the other, Bonita Workflow stands out with automation, modeling and collaboration. A unique tool pools all these strengths and provides an answer to the organization's expectations. Employees or customers need to authenticate only once to access all resources. Second, eXo ECM provides an infrastructure for content management. Documents are created by writers in the Portal, read over by proofreaders who plan the publication during a period of time.

At the end, those documents must be archived. Bonita complements the solution devised by the eXo Platform to implement the flow of documents and organize the collaboration between humans. Third, Bonita is mainly a Workflow Engine. Bonita requires a user interface layer to generate online forms when interacting with humans.

To summarize, the major objective is to benefit from the best of Portal and Workflow components. The following session details how they can be integrated. We will now unveil the underlying technical points behind the integration of eXo Platform and Bonita. This makes deployment easier if clustering is needed to improve performance and reinforce high availability.

This also allows the security context to be propagated from portlets to workflow EJBs. The merge was made easy by the eXo build configuration based on Maven 2. When that merge occurred, Bonita artifacts were created and made available on the Internet. The current repository site is http: When the final version is available, we will also publish the artifacts to http: The inner architecture of eXo is key when integrating third party software components.

Indeed, eXo is based on a lightweight container where services running in the portal are deployed. Dependency Injection is used to propagate references between them. This means that instead of directly hard coding Java references to other components, a service receives those references from the container. This pattern was used when implementing workflow logic in the portal. An eXo service was developed wrapping Bonita functionality. It presents a set of basic functions needed to manipulate the workflow.

The following illustration shows the service interface:. The corresponding implementation is located in the eXo Platform source tree. It can be invoked from portlets or other services, such as the one in charge of Enterprise Content Management. Particularly, it can be leveraged from homemade portlets, which should be interesting in the scope of custom development. Components are loosely coupled. Any evolution in Bonita for example The Portlet communicates with the Workflow Engine through an abstract layer to increase agility.

One benefit of integration is the single login between the Portal and the Workflow Engine. This allows users to not have to authenticate twice when working with workflow portlets.

Bonita implements its own concept of roles to increase flexibility. Bonita tasks are assigned a role determining which J2EE users can execute them. The contents of those roles are dynamically resolved, each time a process is started. To accomplish this, "Role Mappers" are invoked for each possible role. Role Mappers exist as Java code. Although Bonita comes with ready to use Role Mappers, it is possible for process authors to program their own classes and handle custom cases.

The following snippet shows the implemented Java interface. The method basically returns a list of J2EE users corresponding to the specified role. It maps Bonita roles with eXo groups.