/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
package org.jooby.memcached;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import javax.inject.Inject;
import javax.inject.Named;
import net.spy.memcached.MemcachedClient;
import net.spy.memcached.transcoders.Transcoder;
import org.jooby.Session;
import org.jooby.Session.Builder;
import com.typesafe.config.Config;
import com.typesafe.config.ConfigFactory;
import com.typesafe.config.ConfigValueFactory;
/**
* A {@link Session.Store} powered by <a
* href="https://github.com/dustin/java-memcached-client">SpyMemcached</a>
*
* <h2>usage</h2>
*
* <pre>
* {
* use(new SpyMemcached());
*
* session(SpySessionStore.class);
*
* get("/", req {@literal ->} {
* req.session().set("name", "jooby");
* });
* }
* </pre>
*
* The <code>name</code> attribute and value will be stored in a
* <a href="http://memcached.org//">Memcached</a> db.
*
* Session are persisted using the default {@link Transcoder}.
*
* <h2>options</h2>
*
* <h3>timeout</h3>
* <p>
* By default, a memcache session will expire after <code>30 minutes</code>. Changing the default
* timeout is as simple as:
* </p>
*
* <pre>
* # 8 hours
* session.timeout = 8h
*
* # 15 seconds
* session.timeout = 15
*
* # 120 minutes
* session.timeout = 120m
*
* # no timeout
* session.timeout = -1
* </pre>
*
* <h3>key prefix</h3>
* <p>
* Default memcached key prefix is <code>sessions:</code>. Sessions in memcached will look like:
* <code>sessions:ID</code>
*
* <p>
* It's possible to change the default key setting the <code>memcached.sesssion.prefix</code>
* property.
* </p>
*
* @author edgar
* @since 0.7.0
*/
public class SpySessionStore implements Session.Store {
private MemcachedClient memcached;
private String prefix;
private int timeout;
public SpySessionStore(final MemcachedClient memcached,
final String prefix, final int timeoutInSeconds) {
this.memcached = memcached;
this.prefix = prefix;
this.timeout = timeoutInSeconds;
}
@Inject
public SpySessionStore(final MemcachedClient memcached,
final @Named("memcached.session.prefix") String prefix,
@Named("memcached.session.timeout") final String timeout) {
this(memcached, prefix, seconds(timeout));
}
@SuppressWarnings("unchecked")
@Override
public Session get(final Builder builder) {
String key = key(builder.sessionId());
Map<String, String> attrs = (Map<String, String>) memcached.get(key);
if (attrs == null || attrs.size() == 0) {
// expired
return null;
}
// touch session
memcached.touch(key, timeout);
return builder
.accessedAt(Long.parseLong(attrs.remove("_accessedAt")))
.createdAt(Long.parseLong(attrs.remove("_createdAt")))
.savedAt(Long.parseLong(attrs.remove("_savedAt")))
.set(attrs)
.build();
}
@Override
public void save(final Session session) {
String key = key(session);
Map<String, String> attrs = new HashMap<>(session.attributes());
attrs.put("_createdAt", Long.toString(session.createdAt()));
attrs.put("_accessedAt", Long.toString(session.accessedAt()));
attrs.put("_savedAt", Long.toString(session.savedAt()));
memcached.set(key, timeout, attrs);
}
@Override
public void create(final Session session) {
save(session);
}
@Override
public void delete(final String id) {
String key = key(id);
memcached.replace(key, 1, new HashMap<>());
}
private String key(final String id) {
return prefix + id;
}
private String key(final Session session) {
return key(session.id());
}
private static int seconds(final String value) {
try {
return Integer.parseInt(value);
} catch (NumberFormatException ex) {
Config config = ConfigFactory.empty()
.withValue("timeout", ConfigValueFactory.fromAnyRef(value));
return (int) config.getDuration("timeout", TimeUnit.SECONDS);
}
}
}