/**
* Copyright (C) 2013 the original author or authors.
* See the notice.md file distributed with this work for additional
* information regarding copyright ownership.
*
* 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.
*/
package io.hawt.blueprint;
import org.apache.aries.blueprint.container.BlueprintContainerImpl;
import org.omg.CORBA.ObjectHelper;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
/**
* Initialises all the blueprint XML files called <code>META-INF/blueprint.xml</code> on the classpath
*/
public class HawtioBlueprintContextListener implements ServletContextListener {
public static final String CONTAINER_ATTRIBUTE = "org.apache.aries.blueprint.container";
public static final String LOCATION = "blueprintLocation";
public static final String PROPERTIES = "blueprintProperties";
public static final String DEFAULT_LOCATION = "META-INF/blueprint.xml";
public void contextInitialized(ServletContextEvent event) {
ServletContext servletContext = event.getServletContext();
String location = servletContext.getInitParameter(LOCATION);
if (location == null) {
location = DEFAULT_LOCATION;
}
List<URL> resourcePaths = new ArrayList<URL>();
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
try {
Enumeration<URL> resources = classLoader.getResources(location);
while (resources.hasMoreElements()) {
resourcePaths.add(resources.nextElement());
}
Collections.sort(resourcePaths, new Comparator<URL>() {
@Override
public int compare(URL o1, URL o2) {
return o1.toString().compareTo(o2.toString());
}
});
servletContext.log("Loading Blueprint contexts " + resourcePaths);
Map<String, String> properties = new HashMap<String, String>();
String propLocations = servletContext.getInitParameter(PROPERTIES);
if (propLocations != null) {
for (String propLoc : propLocations.split(",")) {
Enumeration<URL> propUrl = classLoader.getResources(propLoc);
while (propUrl.hasMoreElements()) {
URL url = propUrl.nextElement();
InputStream is = url.openStream();
try {
Properties props = new Properties();
props.load(is);
Enumeration names = props.propertyNames();
while (names.hasMoreElements()) {
String key = names.nextElement().toString();
properties.put(key, props.getProperty(key));
}
} finally {
is.close();
}
}
}
}
appendEnvironmentVariables(servletContext, properties);
BlueprintContainerImpl container = new BlueprintContainerImpl(classLoader, resourcePaths, properties, true);
servletContext.setAttribute(CONTAINER_ATTRIBUTE, container);
} catch (Exception e) {
servletContext.log("Failed to startup blueprint container. " + e, e);
}
}
protected void appendEnvironmentVariables(ServletContext servletContext, Map<String, String> properties) {
try {
Map<String, String> env = System.getenv();
if (env != null) {
Set<Map.Entry<String, String>> entries = env.entrySet();
for (Map.Entry<String, String> entry : entries) {
String name = entry.getKey();
String propertyName = convertEnvironmentVariableToSystemProperty(name);
properties.put(propertyName, entry.getValue());
}
}
} catch (Exception e) {
servletContext.log("Failed to load environment variables: " + e, e);
}
}
protected String convertEnvironmentVariableToSystemProperty(String name) {
// system properties may be upper and lower case so lets not mess with the case
// lets convert _ to dots so that folks can specify dots in env vars
return name.replace('_', '.');
}
public void contextDestroyed(ServletContextEvent event) {
ServletContext servletContext = event.getServletContext();
Object container = servletContext.getAttribute(CONTAINER_ATTRIBUTE);
if (container instanceof BlueprintContainerImpl) {
BlueprintContainerImpl blueprint = (BlueprintContainerImpl) container;
blueprint.destroy();
}
}
}