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Because servlets are called from the Web server, it is easy to add the extra protection of SSL for the data transport between the client and the server by enabling SSL on the Web server The servlet requires no special code to take advantage of this powerful secure transport The servlet can also be made to communicate with the LDAP server using SSL, but that feature is not implemented in the code example provided in this chapter
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Connection-Pooling Class
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The bene ts of connection pooling are most fully realized with server-side processes As noted throughout the book, the time to set up an LDAP connection can be an order of magnitude larger than the time for the transaction that follows Our connectionpooling class has the following constructors:
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public LDAPConnectionPool( int min, int max, String host, int port, String authid, String authpw ) public LDAPConnectionPool( int min, int max, String host, int port ) public LDAPConnectionPool( String host, int port )
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The constructor arguments de ne the characteristics of the pool The min argument is the minimum number of connections for the pool to open to the directory server The max argument is the number of connections to which the pool will grow when all connections are in use The host and port arguments determine the server host and port number The authdn and authpw arguments specify the credentials of the user to authenticate as The authdn is a full distinguished name (uid=bjensen, ou=people, o=airiuscom, for example)
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430 Servlets and LDAP
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Once the connection pool has been allocated, LDAP connections are requested with the getConnection method The following code snippet shows setting up a connection pool and obtaining a connection
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LDAPConnectionPool ldapPool = new LDAPConnectionPool( 40, 60, "localhost", 389); LDAPConnection ld = ldapPoolgetConnection();
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When you have nished with the connection, it should be returned to the pool using the close method:
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ldapPoolclose( ld );
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Other than the methods for obtaining the connection and returning it to the pool, you can use the acquired LDAPConnection object just like any other LDAPConnection Other methods of interest in the LDAPConnectionPool class are as follows: printPool prints the contents of the pool to standard output (stdout) setDebug turns debug printouts on or off getDebug returns the current debug setting The class is made available to the servlet engine by the placing of all class les in the CLASSPATH of the servlet engine or by placing them directly in the servlet directory The following class les are part of the pooling package: LDAPConnectionPoolclass LDAPConnectionPool$LDAPConnectionObjectclass The code for the pooling class follows
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import javautil*; import netscapeldap*; public class LDAPConnectionPool { /** * Constructor for specifying all parameters * * @param min initial number of connections * @param max maximum number of connections * @param host host name of LDAP server
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* @param port port number of LDAP server * @param authdn DN to authenticate as * @param authpw password for authentication * @exception LDAPException on failure to create connections */ public LDAPConnectionPool( int min, int max, String host, int port, String authdn, String authpw ) throws LDAPException { thispoolSize = min; thispoolMax = max; thishost = host; thisport = port; thisauthdn = authdn; thisauthpw = authpw; thisdebugMode = false; createPool(); } /** * Constructor for specifying all parameters, anonymous * identity * * @param min initial number of connections * @param max maximum number of connections * @param host host name of LDAP server * @param port port number of LDAP server * @exception LDAPException on failure to create connections */ public LDAPConnectionPool( int min, int max, String host, int port) throws LDAPException { this( min, max, host, port, "", ""); } /** * Constructor for using default parameters, * anonymous identity * * @param host host name of LDAP server * @param port port number of LDAP server * @exception LDAPException on failure to create connections */
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