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/*******************************************************************************
* ============LICENSE_START====================================================
* * org.onap.aai
* * ===========================================================================
* * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
* * Copyright © 2017 Amdocs
* * ===========================================================================
* * Licensed under the Apache License, Version 2.0 (the "License");
* * you may not use this file 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.
* * ============LICENSE_END====================================================
* *
* * ECOMP is a trademark and service mark of AT&T Intellectual Property.
* *
******************************************************************************/
package com.att.dao.session;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import com.att.cssa.rserv.TransFilter;
import com.att.inno.env.APIException;
import com.att.inno.env.Env;
import com.att.inno.env.EnvStore;
import com.att.inno.env.Slot;
import com.att.inno.env.TransStore;
import com.att.inno.env.util.Pool;
import com.att.inno.env.util.Pool.Creator;
import com.att.inno.env.util.Pool.Pooled;
import com.datastax.driver.core.Cluster;
import com.datastax.driver.core.Session;
public class SessionFilter<TRANS extends TransStore> implements Filter {
public static final String SESSION_SLOT = "__SESSION__";
private static Slot sessionSlot;
private static Pool<Session> pool;
public SessionFilter(EnvStore<?> env, Cluster cluster, String keyspace) {
synchronized(env) {
if(sessionSlot==null) {
sessionSlot = env.slot(SESSION_SLOT);
}
if(pool==null) {
pool = new Pool<Session>(new SessionCreator(env,cluster,keyspace));
}
}
}
@Override
public void init(FilterConfig fc) throws ServletException {
// Session does not need any sort of configuration from Filter
}
@Override
public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws IOException, ServletException {
@SuppressWarnings("unchecked")
TRANS trans = (TRANS)req.getAttribute(TransFilter.TRANS_TAG);
try {
Pooled<Session> psess = pool.get();
try {
trans.put(sessionSlot, psess.content);
chain.doFilter(req, resp);
} finally {
psess.done();
}
} catch (APIException e) {
throw new ServletException(e);
}
}
public Pooled<Session> load(TRANS trans) throws APIException {
Pooled<Session> psess = pool.get();
trans.put(sessionSlot, psess.content);
return psess;
}
/**
* Clear will drain the pool, so that new Sessions will be constructed.
*
* Suitable for Management calls.
*/
public static void clear() {
if(pool!=null) {
pool.drain();
}
}
@Override
public void destroy() {
pool.drain();
}
private class SessionCreator implements Creator<Session> {
private Cluster cluster;
private String keyspace;
private Env env;
public SessionCreator(Env env, Cluster cluster, String keyspace) {
this.cluster = cluster;
this.keyspace = keyspace;
this.env = env;
}
@Override
public Session create() throws APIException {
env.info().log("Creating a Cassandra Session");
return cluster.connect(keyspace);
}
@Override
public void destroy(Session t) {
env.info().log("Shutting down a Cassandra Session");
t.close();
}
@Override
public boolean isValid(Session t) {
return true;
}
@Override
public void reuse(Session t) {
// Nothing is needed to reuse this Session
}
}
}
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