AbstractSessionDAO.java

package com.hwlcn.security.session.mgt.eis;

import com.hwlcn.security.session.Session;
import com.hwlcn.security.session.mgt.SimpleSession;
import com.hwlcn.security.session.UnknownSessionException;

import java.io.Serializable;

public abstract class AbstractSessionDAO implements SessionDAO {


    private SessionIdGenerator sessionIdGenerator;

    public AbstractSessionDAO() {
        this.sessionIdGenerator = new JavaUuidSessionIdGenerator();
    }

    public SessionIdGenerator getSessionIdGenerator() {
        return sessionIdGenerator;
    }

    public void setSessionIdGenerator(SessionIdGenerator sessionIdGenerator) {
        this.sessionIdGenerator = sessionIdGenerator;
    }

    protected Serializable generateSessionId(Session session) {
        if (this.sessionIdGenerator == null) {
            String msg = "sessionIdGenerator attribute has not been configured.";
            throw new IllegalStateException(msg);
        }
        return this.sessionIdGenerator.generateId(session);
    }

    public Serializable create(Session session) {
        Serializable sessionId = doCreate(session);
        verifySessionId(sessionId);
        return sessionId;
    }

    private void verifySessionId(Serializable sessionId) {
        if (sessionId == null) {
            String msg = "sessionId returned from doCreate implementation is null.  Please verify the implementation.";
            throw new IllegalStateException(msg);
        }
    }

    protected void assignSessionId(Session session, Serializable sessionId) {
        ((SimpleSession) session).setId(sessionId);
    }

    protected abstract Serializable doCreate(Session session);

    public Session readSession(Serializable sessionId) throws UnknownSessionException {
        Session s = doReadSession(sessionId);
        if (s == null) {
            throw new UnknownSessionException("There is no session with id [" + sessionId + "]");
        }
        return s;
    }

    protected abstract Session doReadSession(Serializable sessionId);

}