/*
* 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.apache.sling.launchpad.testservices.events;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;
import javax.servlet.ServletException;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Properties;
import org.apache.felix.scr.annotations.Property;
import org.apache.felix.scr.annotations.Service;
import org.apache.sling.api.SlingConstants;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.api.servlets.SlingSafeMethodsServlet;
import org.apache.sling.commons.json.JSONException;
import org.apache.sling.commons.json.io.JSONWriter;
import org.osgi.service.event.Event;
import org.osgi.service.event.EventHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/** Count the number of OSGi events that we receive on specific topics, and
* report them to clients.
*/
@SuppressWarnings("serial")
@Component(immediate=true, metatype=false)
@Service
@Properties({
@Property(name="service.description", value="Paths Test Servlet"),
@Property(name="service.vendor", value="The Apache Software Foundation"),
@Property(name="sling.servlet.paths", value="/testing/EventsCounter"),
@Property(name="sling.servlet.extensions", value="json"),
@Property(
name=org.osgi.service.event.EventConstants.EVENT_TOPIC,
value= {
SlingConstants.TOPIC_RESOURCE_ADDED,
SlingConstants.TOPIC_RESOURCE_RESOLVER_MAPPING_CHANGED
})
})
public class EventsCounterImpl extends SlingSafeMethodsServlet implements EventHandler,EventsCounter {
private final Map<String, AtomicInteger> counters = new HashMap<String, AtomicInteger>();
private final Logger log = LoggerFactory.getLogger(getClass());
public synchronized void handleEvent(Event event) {
final String topic = event.getTopic();
AtomicInteger counter = counters.get(topic);
if(counter == null) {
counter = new AtomicInteger();
counters.put(topic, counter);
}
counter.incrementAndGet();
log.debug("{} counter is now {}", topic, counter.get());
}
public synchronized int getEventsCount(String topic) {
final AtomicInteger counter = counters.get(topic);
if(counter == null) {
log.debug("getEventsCount({}) returns 0, counter not found", topic);
return 0;
}
return counter.get();
}
@Override
protected void doGet(SlingHttpServletRequest request,SlingHttpServletResponse response)
throws ServletException, IOException {
response.setContentType("application/json");
response.setCharacterEncoding("UTF-8");
try {
final JSONWriter w = new JSONWriter(response.getWriter());
w.setTidy(true);
w.object();
for(Map.Entry<String, AtomicInteger> entry : counters.entrySet()) {
w.key(entry.getKey()).value(entry.getValue());
}
w.endObject();
} catch(JSONException je) {
throw (IOException)new IOException("JSONException in doGet").initCause(je);
}
}
}