/**
* 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);
}
protected JolokiaHandler(Map<String, String> configParameters, Restrictor restrictor) {
log = new JolokiaLogHandler(LoggerFactory.getLogger(JolokiaHandler.class));
Configuration config = initConfig(configParameters);
if (restrictor == null) {
restrictor =
createRestrictor(NetworkUtil.replaceExpression(config.get(ConfigKey.POLICY_LOCATION)));
}
log.info("Using restrictor " + restrictor);
BackendManager backendManager = new BackendManager(config, log, restrictor);
requestHandler = new HttpRequestHandler(config, backendManager, log);
}
private void initLimits(Configuration pConfig) {
// Max traversal depth
if (pConfig != null) {
convertOptionsBuilder =
new JsonConvertOptions.Builder(
getNullSaveIntLimit(pConfig.get(MAX_DEPTH)),
getNullSaveIntLimit(pConfig.get(MAX_COLLECTION_SIZE)),
getNullSaveIntLimit(pConfig.get(MAX_OBJECTS)));
} else {
convertOptionsBuilder = new JsonConvertOptions.Builder();
}
}
// 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;
}
// init various application wide stores for handling history and debug output.
private void initStores(Configuration pConfig) {
int maxEntries = pConfig.getAsInt(HISTORY_MAX_ENTRIES);
int maxDebugEntries = pConfig.getAsInt(DEBUG_MAX_ENTRIES);
historyStore = new HistoryStore(maxEntries);
debugStore = new DebugStore(maxDebugEntries, pConfig.getAsBoolean(DEBUG));
try {
localDispatcher.initMBeans(historyStore, debugStore);
} catch (NotCompliantMBeanException e) {
intError("Error registering config MBean: " + e, e);
} catch (MBeanRegistrationException e) {
intError("Cannot register MBean: " + e, e);
} catch (MalformedObjectNameException e) {
intError("Invalid name for config MBean: " + e, e);
}
}
// 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);
}
// Initialize this object;
private void init(Configuration pConfig) {
// Central objects
converters = new Converters();
initLimits(pConfig);
// Create and remember request dispatchers
localDispatcher = new LocalRequestDispatcher(converters, restrictor, pConfig, logHandler);
ServerHandle serverHandle = localDispatcher.getServerInfo();
requestDispatchers =
createRequestDispatchers(
pConfig.get(DISPATCHER_CLASSES), converters, serverHandle, restrictor);
requestDispatchers.add(localDispatcher);
// Backendstore for remembering agent state
initStores(pConfig);
}
protected Configuration initConfig(Map<String, String> params) {
Configuration config =
new Configuration(ConfigKey.AGENT_ID, NetworkUtil.getAgentId(hashCode(), "vertx"));
config.updateGlobalConfiguration(params);
return config;
}
