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DataSet is an object for storing results of your queries offline for further processing and can be viewed as an in-memory representation of a database. DataSet consists of one or more DataTable objects, which in turn consist of a collection of DataRow objects. Figure 7-3 gives you a complete picture of the internals of DataSet.

You ll also need to provide methods for controlling the engine, to see if it is on or off, to start it, and to open and close the throttle. These are basic JavaScript functions, as shown here:

Summary

checkEngine: function(){ if (this._currentSpeed>0) return ("Engine is running at speed" + this._currentSpeed); else return "Engine is off"; }, startEngine: function(){ if(this._currentSpeed == 0) this._currentSpeed = 1;

In this chapter, we covered portlet preferences for setting and retrieving individual user configuration settings for a portlet. We also discussed the preferences validator for verifying each user s preferences when they are stored. The portlet s configuration can be accessed through the methods on the GenericPortlet base class if necessary. Information about the portal server the portlet is running in can be retrieved through the PortalContext class. This information includes available window states, portlet modes, and portal properties.

Figure 7-3. DataSet architecture As you can see, DataSet has two primary collections: The Tables collection is exposed by the Tables property and consists of a DataTableCollection object that can have zero or more DataTable objects. Each DataTable represents a set of data from the underlying data source. The Relations collection is exposed as the Relations property and consists of a DataRelationCollection object. The DataRelationCollection object in turn contains zero or more DataRelation objects. Each DataRelation object represents the parentchild relationship between two DataTable objects.

SECURITY AND SINGLE Sign-On (SSO) are not unique to portlets, but when considering their implementation you must take into account some special advantages, disadvantages, and responsibilities A portlet has some security advantages over a conventional application You do not have to concern yourself with obtaining a login from the user, for example this is the responsibility of the container You do still have some responsibilities; your portlet must manage access to its resources For example, a corporate address book should probably be accessible only to employees of the company, whereas a private address book should in general be accessible by only one person A portlet may obtain information from external resources, so you also need to be aware of the options for passing security information around possibly over the network.

else return "Engine is already running"; }, openThrottle: function(){ if (this._currentSpeed<10) this._currentSpeed++; }, closeThrottle: function(){ if (this._currentSpeed>0) this._currentSpeed--; }

As stated earlier, DataTable is a set of data and consists of rows and columns The DataTable class has the following three important collections: The Columns collection is exposed as the Columns property and is an instance of the DataColumnCollection class It contains zero or more DataColumn objects Each DataColumn object represents a column or field of the DataTable, just like a database column These columns define the structure of a DataTable The Rows collection is exposed as the Rows property and is an instance of the DataRowCollection class It contains zero or more DataRow objects Each DataRow is similar to a database record and contains the actual data of the DataTable Just like a database table, a DataTable can also have constraints, such as unique key constraints and foreign key constraints The Constraints collection is exposed as the Constraints property and is an instance of the ConstraintCollection class.

While the developer s natural inclination is to Keep It Simple, Stupid (KISS), it is no longer a safe assumption (if it ever was) that the network is secure by default Avoiding security vulnerabilities adds a regrettable but necessary level of complexity to the design of any portlet acting as the gateway to sensitive information This chapter discusses the standards, protocols, and APIs that are required to implement secure portlets The security mechanisms specified in the portlet API are the most basic level of portlet security We discuss SSO strategies for portals, including authentication with Java Authentication and Authorization Services (JAAS) We also demonstrate how to use the Java Generic Security Services Application Program Interface (GSS-API) with Kerberos Before we embark on our analysis, let s briefly consider a situation where all of these tools might be required for a truly integrated solution.