org.hibersap.ejb.interceptor.HibersapSessionInterceptor Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2017 akquinet tech@spree GmbH
*
* This file is part of Hibersap.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this software except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.hibersap.ejb.interceptor;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import javax.interceptor.AroundInvoke;
import javax.interceptor.InvocationContext;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibersap.HibersapException;
import org.hibersap.session.Session;
import org.hibersap.session.SessionManager;
import static java.lang.String.format;
import static org.hibersap.ejb.util.ReflectionUtil.getHibersapSessionFields;
import static org.hibersap.ejb.util.ReflectionUtil.getSessionManagerJndiName;
import static org.hibersap.ejb.util.ReflectionUtil.injectSessionIntoTarget;
public class HibersapSessionInterceptor {
private static final String HIBERSAP_SESSION_PREFIX = "hibersap.session.";
private static final Log LOGGER = LogFactory.getLog(HibersapSessionInterceptor.class);
@AroundInvoke
public Object injectSessionsIntoEjb(final InvocationContext ctx) throws Exception {
Set sessionFields = getHibersapSessionFields(ctx.getTarget());
Map sessionsCreated = new HashMap();
try {
for (Field sessionField : sessionFields) {
String jndiName = getSessionManagerJndiName(sessionField);
String key = HIBERSAP_SESSION_PREFIX + jndiName;
Session session = (Session) ctx.getContextData().get(key);
if (session == null) {
LOGGER.debug("Create Hibersap session for SessionManager " + jndiName);
session = openSession(jndiName);
sessionsCreated.put(session, jndiName);
ctx.getContextData().put(key, session);
}
injectSessionIntoTarget(ctx.getTarget(), sessionField, session);
}
return ctx.proceed();
} finally {
closeSessions(sessionsCreated, ctx.getContextData());
}
}
private void closeSessions(final Map sessions, final Map contextData) {
Set sessionManagerNamesWithError = new HashSet();
for (Session session : sessions.keySet()) {
String jndiName = sessions.get(session);
try {
contextData.remove(HIBERSAP_SESSION_PREFIX + jndiName);
if (session != null && !session.isClosed()) {
LOGGER.debug("Close Hibersap session for SessionManager " + jndiName);
session.close();
}
} catch (RuntimeException e) {
LOGGER.error("Error closing Hibersap Session for SessionManager with JNDI name " + jndiName, e);
sessionManagerNamesWithError.add(jndiName);
}
}
if (!sessionManagerNamesWithError.isEmpty()) {
LOGGER.error(format(
"Error closing Session(s) for the SessionManager(s): %s. "
+
"The corresponding SAP connection may not be released! For individual reasons see error logs.",
sessionManagerNamesWithError
));
}
}
private Session openSession(final String sessionManagerJndiName) {
SessionManager sessionManager = lookupSessionManager(sessionManagerJndiName);
return sessionManager.openSession();
}
private SessionManager lookupSessionManager(final String jndiName) {
InitialContext context = null;
try {
context = new InitialContext();
Object object = context.lookup(jndiName);
if (object == null) {
throw new HibersapException(
format("Lookup for JNDI name '%s' returned null. Expected to find an instance of %s",
jndiName, SessionManager.class.getName())
);
}
if (!SessionManager.class.isAssignableFrom(object.getClass())) {
throw new HibersapException(
format("Object bound under JNDI name '%s' is not a %s but an instance of %s",
jndiName, SessionManager.class.getName(), object.getClass().getName())
);
}
return (SessionManager) object;
} catch (NamingException e) {
throw new HibersapException("Error creating InitialContext", e);
} finally {
if (context != null) {
try {
context.close();
} catch (NamingException e) {
LOGGER.warn("Error closing InitialContext", e);
}
}
}
}
}