LdapConnections.java

/*
 ************************************************************************
 *******************  CANADIAN ASTRONOMY DATA CENTRE  *******************
 **************  CENTRE CANADIEN DE DONNÉES ASTRONOMIQUES  **************
 *
 *  (c) 2014.                            (c) 2014.
 *  Government of Canada                 Gouvernement du Canada
 *  National Research Council            Conseil national de recherches
 *  Ottawa, Canada, K1A 0R6              Ottawa, Canada, K1A 0R6
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 *  respect to the software,             soit, concernant le logiciel,
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 *  software.  Neither the name          de l'utilisation du logiciel. Ni
 *  of the National Research             le nom du Conseil National de
 *  Council of Canada nor the            Recherches du Canada ni les noms
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 *  $Revision: 4 $
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 ************************************************************************
 */

package ca.nrc.cadc.ac.server.ldap;

import org.apache.log4j.Logger;

import ca.nrc.cadc.profiler.Profiler;

import com.unboundid.ldap.sdk.LDAPConnection;
import com.unboundid.ldap.sdk.LDAPException;
import com.unboundid.ldap.sdk.LDAPReadWriteConnectionPool;

/**
 * This class in the means by which the DAO classes obtain
 * connections to LDAP.  The connections are either manual (if config is
 * provided) or automatic and with a connection pool if a persistence
 * object is provided.
 *
 * This class is not thread-safe but does not need to be since new
 * instances of the DAO classes are always created.
 *
 * @author majorb
 */
class LdapConnections
{
    private final static Logger log = Logger.getLogger(LdapConnections.class);

    Profiler profiler = new Profiler(LdapConnections.class);

    private LdapPersistence persistence;

    private LDAPConnection autoConfigReadOnlyConn;
    private LDAPConnection autoConfigReadWriteConn;

    private LdapConfig config;

    private LDAPReadWriteConnectionPool manualConfigPool;
    private LDAPConnection manualConfigReadOnlyConn;
    private LDAPConnection manualConfigReadWriteConn;

    LdapConnections(LdapPersistence persistence)
    {
        this.persistence = persistence;
    }

    LdapConnections(LdapConfig config)
    {
        this.config = config;
    }

    LDAPConnection getReadOnlyConnection() throws LDAPException
    {
        if (persistence != null)
        {
            log.debug("Obtaining auto config read only connection.");
            if (autoConfigReadOnlyConn == null)
            {
                autoConfigReadOnlyConn = persistence.getReadOnlyConnection();
                profiler.checkpoint("Get read only connection");
            }
            return autoConfigReadOnlyConn;
        }
        else
        {
            log.debug("Obtaining manual config read only connection.");
            if (manualConfigPool == null)
            {
                log.debug("Creating manual config connection pool--should only see this " +
                        "message when running unit tests.");
                manualConfigPool = LdapConnectionPool.createPool(config);
            }
            if (manualConfigReadOnlyConn == null)
            {
                manualConfigReadOnlyConn = manualConfigPool.getReadConnection();
            }
            return manualConfigReadOnlyConn;
        }
    }

    LDAPConnection getReadWriteConnection() throws LDAPException
    {
        if (persistence != null)
        {
            log.debug("Obtaining auto config read write connection.");
            if (autoConfigReadWriteConn == null)
            {
                autoConfigReadWriteConn = persistence.getReadWriteConnection();
                profiler.checkpoint("Get read write connection");
            }
            return autoConfigReadWriteConn;
        }
        else
        {
            log.debug("Obtaining manual config read write connection.");
            if (manualConfigPool == null)
            {
                log.debug("Creating manual config connection pool--should only see this " +
                        "message when running unit tests.");
                manualConfigPool = LdapConnectionPool.createPool(config);
            }
            if (manualConfigReadWriteConn == null)
            {
                manualConfigReadWriteConn = manualConfigPool.getReadConnection();
            }
            return manualConfigReadWriteConn;
        }
    }

    void releaseConnections()
    {
        if (persistence != null)
        {
            log.debug("Releasing auto config connections.");
            if (autoConfigReadOnlyConn != null)
            {
                persistence.releaseReadOnlyConnection(autoConfigReadOnlyConn);
                profiler.checkpoint("Release read only connection");
            }
            if (autoConfigReadWriteConn != null)
            {
                persistence.releaseReadWriteConnection(autoConfigReadWriteConn);
                profiler.checkpoint("Release read write connection");
            }
        }
        else
        {
            log.debug("Releasing manual config connections.");
            if (manualConfigReadOnlyConn != null)
            {
                manualConfigPool.releaseReadConnection(manualConfigReadOnlyConn);
            }
            if (manualConfigReadWriteConn != null)
            {
                manualConfigPool.releaseWriteConnection(manualConfigReadWriteConn);
            }
        }
    }

    /**
     * Best-effort manual pool shutdown.
     */
    @Override
    public void finalize()
    {
        if (manualConfigPool != null)
        {
            log.debug("Closing manual config connection pool--should only see this " +
            		"message when running unit tests.");
            manualConfigPool.close();
        }
    }

    LdapConfig getCurrentConfig()
    {
        if (persistence != null)
            return persistence.getCurrentConfig();
        else
            return config;

    }

}