/**
* Initialize the backend systems, the log handler and the restrictor. A subclass can tune this
* step by overriding {@link #createRestrictor(String)} and {@link
* #createLogHandler(ServletConfig, boolean)}
*
* @param pServletConfig servlet configuration
*/
@Override
public void init(ServletConfig pServletConfig) throws ServletException {
super.init(pServletConfig);
Configuration config = initConfig(pServletConfig);
// Create a log handler early in the lifecycle, but not too early
String logHandlerClass = config.get(ConfigKey.LOGHANDLER_CLASS);
logHandler =
logHandlerClass != null
? (LogHandler) ClassUtil.newInstance(logHandlerClass)
: createLogHandler(pServletConfig, Boolean.valueOf(config.get(ConfigKey.DEBUG)));
// Different HTTP request handlers
httpGetHandler = newGetHttpRequestHandler();
httpPostHandler = newPostHttpRequestHandler();
if (restrictor == null) {
restrictor =
createRestrictor(NetworkUtil.replaceExpression(config.get(ConfigKey.POLICY_LOCATION)));
} else {
logHandler.info("Using custom access restriction provided by " + restrictor);
}
configMimeType = config.get(ConfigKey.MIME_TYPE);
backendManager = new BackendManager(config, logHandler, restrictor);
requestHandler = new HttpRequestHandler(config, backendManager, logHandler);
initDiscoveryMulticast(config);
}
// Examines servlet config and servlet context for configuration parameters.
// Configuration from the servlet context overrides servlet parameters defined in web.xml
Configuration initConfig(ServletConfig pConfig) {
Configuration config =
new Configuration(ConfigKey.AGENT_ID, NetworkUtil.getAgentId(hashCode(), "servlet"));
// From ServletContext ....
config.updateGlobalConfiguration(new ServletConfigFacade(pConfig));
// ... and ServletConfig
config.updateGlobalConfiguration(new ServletContextFacade(getServletContext()));
// Set type last and overwrite anything written
config.updateGlobalConfiguration(
Collections.singletonMap(ConfigKey.AGENT_TYPE.getKeyValue(), "servlet"));
return config;
}
// For war agent needs to be switched on
private boolean listenForDiscoveryMcRequests(Configuration pConfig) {
// Check for system props, system env and agent config
boolean sysProp =
System.getProperty("jolokia." + ConfigKey.DISCOVERY_ENABLED.getKeyValue()) != null;
boolean env = System.getenv("JOLOKIA_DISCOVERY") != null;
boolean config = pConfig.getAsBoolean(ConfigKey.DISCOVERY_ENABLED);
return sysProp || env || config;
}
// Try to find an URL for system props or config
private String findAgentUrl(Configuration pConfig) {
// System property has precedence
String url = System.getProperty("jolokia." + ConfigKey.DISCOVERY_AGENT_URL.getKeyValue());
if (url == null) {
url = System.getenv("JOLOKIA_DISCOVERY_AGENT_URL");
if (url == null) {
url = pConfig.get(ConfigKey.DISCOVERY_AGENT_URL);
}
}
return NetworkUtil.replaceExpression(url);
}
