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Java Connector Architecture
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Just like the JDBC API, the CCI APIs can be divided into four sections:
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n APIs related to establishing a connection to an EIS, also referred to as the
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n CCI APIs, which cover command execution on an EIS, referred to as the
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n Record/ResultSet interfaces, which encapsulate the query results to an EIS n Metadata interfaces, which make it possible to examine an EISs metadata for
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example, the attributes or type of EIS data to be queried Code example illustrates JCA code to retrieve and update data
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Public class JCAclass1... int count; try { // obtain the connection ConnectionSpec spec = new CciConnectionSpec(user, password); Connection con = cf.getConnection(spec); Interaction ix = con.createInteraction(); CciInteractionSpec iSpec = new CciInteractionSpec(); // command execution iSpec.setSchema(user); iSpec.setFunctionName("CLIENTCOUNT"); // handle the result set RecordFactory rf = cf.getRecordFactory(); IndexedRecord iRec = rf.createIndexedRecord("InputRecord"); Record rec = ix.execute(iSpec, iRec); Iterator iter = ((IndexedRecord)rec).iterator(); while(iter.hasNext()) { Object obj = iter.next(); if(obj instanceof Integer) count = ((Integer)obj).intValue(); } // close the connection con.close(); } catch(Exception e) { e.printStackTrace(); } System.out.println("the count is " + count); ...
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6: Legacy Connectivity
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Basic JCA 1.0 Adapter Implementation
Let s quickly explore the steps required to implement a JCA adapter that is, a set of classes with which a JEE application server targets a particular enterprise system. As mentioned, a JCA adapter functions in much the same way as a JDBC driver connects to databases. We will describe the adapter s capabilities, as well as how to deploy and run it. We will see what occurs when the adapter executes in the container. It s important to frame the sample-adapter discussion by describing its functionality. Typically, when using an adapter we need to
n Determine the status of resources within the life cycle n Establish a connection to the resource(s) n Manage a transaction involving the resource n Submit work to the resource n Provide messaging capability to alert interested processes n Provide security to protect resources
To use a JCA adapter, you need a JEE application server with JCA specification support. For example, BEA WebLogic version 8.1 supports JCA 1.0, and Weblogic version 9.1 supports JCA 1.5. You upload the resource adapter archive for example, the Ucnyadapter.rar file. The adapter includes two class categories:
n Managed classes
The application server calls managed classes to perform the connection management. They're needed only if the application server is managing the connection via a connection pool, which is probably the case. These required classes, which the aforementioned managed classes may call, establish the connection to the EIS.
n Physical connection classes
ManagedConnectionFactory
With the UCManagedConnectionFactory class, which implements the ManagedConnectionFactory interface, you create the UCConnectionFactory and UCManagedConnection classes. In JCA 1.5, the ManagedConnectionFactory interface remains unchanged to preserve backward compatibility, but if you want outbound resources to have access to the capabilities provided to the resource adapter, also implement the new ResourceAdapterAssociation interface. The UCManagedConnectio nFactory class acts as the main entry point for the application server to call into the adapter:
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package ucnyjca; import import import import import import import import java.io.PrintWriter; java.io.Serializable; java.sql.DriverManager; java.util.Iterator; java.util.Set; javax.resource.ResourceException; javax.resource.spi.*; javax.security.auth.Subject;
public class UCManagedConnectionFactory implements ManagedConnectionFactory, Serializable { public UCManagedConnectionFactory() { System.out.println("We are executing UCManagedConnectionFactory.constructor"); } public Object createConnectionFactory(ConnectionManager cxManager) throws ResourceException { System.out.println("We are executing UCManagedConnectionFactory.createConnectionFactory,1"); return new UCDataSource(this, cxManager); } public Object createConnectionFactory() throws ResourceException { System.out.println("We are executing UCManagedConnectionFactory.createManagedFactory,2"); return new UCDataSource(this, null); } public ManagedConnection createManagedConnection (Subject subject, ConnectionRequestInfo info) { System.out.println("We are executing UCManagedConnectionFactory.createManagedConnection"); return new UCManagedConnection(this, "test"); }
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public ManagedConnection matchManagedConnections (Set connectionSet, Subject subject, ConnectionRequestInfo info) throws ResourceException { System.out.println("We are executing UCManagedConnectionFactory.matchManagedConnections"); return null; } public void setLogWriter(PrintWriter out) throws ResourceException { System.out.println("We are executing UCManagedConnectionFactory.setLogWriter"); } public PrintWriter getLogWriter() throws ResourceException { System.out.println("We are executing UCManagedConnectionFactory.getLogWriter"); return DriverManager.getLogWriter(); } public boolean equals(Object obj) { if(obj == null) return false; if(obj instanceof UCManagedConnectionFactory) { int hash1 = ((UCManagedConnectionFactory)obj).hashCode(); int hash2 = hashCode(); return hash1 == hash2; } else { return false; } } public int hashCode() { return 1; } }
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