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6: Legacy Connectivity
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The UCConnectionRequestInfo class contains the data (such as the username, password, and other information) necessary to establish a connection:
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package ucnyjca; import javax.resource.spi.ConnectionRequestInfo; public class UCConnectionRequestInfo implements ConnectionRequestInfo { private String user; private String password; public UCConnectionRequestInfo(String user, String password) { System.out.println("We are executing UCConnectionRequestInfo"); this.user = user; this.password = password; } public String getUser() { System.out.println("We are executing UCConnectionRequestInfo.getUser"); return user; } public String getPassword() { System.out.println("We are executing UCConnectionRequestInfo.getPassword"); return password; } public boolean equals(Object obj) { System.out.println("We are executing UCConnectionRequestInfo.equals"); if(obj == null) return false; if(obj instanceof UCConnectionRequestInfo) { UCConnectionRequestInfo other = (UCConnectionRequestInfo)obj; return isEqual(user, other.user) &&
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isEqual(password, other.password); } else { return false; } } public int hashCode() { System.out.println("We are executing UCConnectionRequestInfo.hashCode"); String result = "" + user + password; return result.hashCode(); } private boolean isEqual(Object o1, Object o2) { System.out.println("We are executing UCConnectionRequestInfo.isEqual"); if(o1 == null) return o2 == null; else return o1.equals(o2); } }
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The UCDataSource class serves as a connection factory for the underlying connections. Because the example adapter does not implement the CCI interfaces, it implements the DataSource interface in the javax.sql package:
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package ucnyjca; import; import; import java.sql.*; import javax.naming.Reference; import javax.resource.Referenceable; import javax.resource.ResourceException; import javax.resource.spi.ConnectionManager; import javax.resource.spi.ManagedConnectionFactory; import javax.sql.DataSource; public class UCDataSource implements DataSource, Serializable, Referenceable
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6: Legacy Connectivity
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{ private String desc; private ManagedConnectionFactory mcf; private ConnectionManager cm; private Reference reference; public UCDataSource(ManagedConnectionFactory mcf, ConnectionManager cm) { System.out.println("We are executing UCDataSource"); this.mcf = mcf; if(cm == null) = new UCConnectionManager(); else = cm; } public Connection getConnection(String username, String password) throws SQLException { System.out.println("We are executing UCDataSource.getConnection,2"); try { javax.resource.spi.ConnectionRequestInfo info = new UCConnectionRequestInfo(username, password); return (Connection)cm.allocateConnection(mcf, info); } catch(ResourceException ex) { throw new SQLException(ex.getMessage()); } } public int getLoginTimeout() throws SQLException { return DriverManager.getLoginTimeout(); } public void setLoginTimeout(int seconds) throws SQLException { DriverManager.setLoginTimeout(seconds); } public PrintWriter getLogWriter() throws SQLException
Java Connector Architecture
{ return DriverManager.getLogWriter(); } public void setLogWriter(PrintWriter out) throws SQLException { DriverManager.setLogWriter(out); } public String getDescription() { return desc; } public void setDescription(String desc) { this.desc = desc; } public void setReference(Reference reference) { this.reference = reference; } public Reference getReference() { return reference; } }
JCA 1.5 Adapter Implementation
Here, we will cover JCA 1.5 enhancements to provide you with a background for how they fit into the overall architecture of JEE / EIS connectivity. Here again, the four new contracts are as follows:
n Life Cycle Management n Work Management Contracts n Message Inflow n Transaction Inflow Contracts
6: Legacy Connectivity
The JCA 1.5 specification defines resource adapters as: a system-level software driver that is used by a Java application to connect to an EIS. The resource adapter plugs into an application server and provides connectivity between the EIS, the application server, and the enterprise application. With respect to Life Cycle Management, the JCA 1.0 release provided a life cycle model for managed connections and their associated connection handles. It included no such life cycle for the resource adapter. The first moment of life for the deployed resource adapter was when a managed-connection factory was created. This has been corrected in JCA 1.5 . The ResourceAdapter interface in the javax.resource.spi package represents a resource adapter. There are two methods in the ResourceAdapter interface that control life cycle management: start() and stop(). The start() method is used when an application server starts a resource adapter . The stop() method is used by the application server to release a resource adapter. At startup, the application server creates an instance of the <resourceadpter-class> and sets the properties as specified in the deployment descriptor. The start method is then called, passing in an object implementing the BootstrapContext interface. You can use this object to: create timers to be used to schedule work at a specified interval or datetime, schedule work on other threads, and control imported transactions. The application server typically calls the stop() method on the resource adapter as part of the shutdown process. The JCA 1.5 specification describes two phases to this process. First, the application server ensures that all applications that depend on the resource adapter have stopped. The application server then calls the stop() method. The resource adapter then performs an housekeeping (for example, release resources) and ultimate shutdown. The Work Management contract provides a way for the resource adapter to submit work to the application server. The WorkManager lets a resource adapter schedule work for synchronous or asynchronous execution on an application-server thread. This work can be performed in a transaction the resource adapter imports, in which case the XATerminator lets the work be completed. A Timer provides for delayed or periodic execution of work. It creates an object that extends the Work interface in the package. The Work interface extends Runnable, and you should implement the work to be performed in the run() method, similar to a program that uses Java threads directly. The WorkManager interface provides three sets of methods (doWork, startWork, and scheduleWork) for processing work. The doWork methods on WorkManager allow work to be executed synchronously, blocking until that work has completed. If the application server is busy, it might defer the start of this piece of work. The doWork() method gives the application
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