package com.coalmine.connector.servlet.filter;
import java.util.logging.Logger;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import com.coalmine.connector.logging.GaeCoalmineHandler;
import com.coalmine.connector.logging.GwtGaeCoalmineHandler;
/**
* A CoalmineFilter which automatically collects the environment and version from
* the GAE environment variables.
*
* This filter also adds a JUL Handler since GAE uses JUL. Any messages logged as
* WARNING or SEVERE are automatically sent to Coalmine. You can disable this behavior by
* adding the below to your web.xml filter.
*
* <init-param>
* <init-name>jul-handler</init-name>
* <init-value>false</init-value>
* </init-param>
*/
public class GaeCoalmineFilter extends CoalmineFilter {
/** Class member just so that the log does not get garbage collected. */
protected Logger _log;
@Override
public void init(FilterConfig config) throws ServletException {
super.init(config);
String environment = config.getInitParameter("environment");
if (environment == null || environment.isEmpty()) {
environment = System.getProperty("com.google.appengine.runtime.environment");
setEnvironment(environment);
}
String version = config.getInitParameter("version");
if (version == null || version.isEmpty()) {
version = System.getProperty("com.google.appengine.application.version");
setVersion(version);
}
// GAE uses JUL so we provide an easy way to hook into those log messages
// By default we always do this, but allow the client to disable with a config param
String julHandler = config.getInitParameter("jul-handler");
julHandler = julHandler == null ? "" : julHandler.toLowerCase();
if ("gwt".equals(julHandler)) {
_log = Logger.getLogger("");
_log.addHandler(new GwtGaeCoalmineHandler(connector));
} else if (!"false".equals(julHandler)) {
_log = Logger.getLogger("");
_log.addHandler(new GaeCoalmineHandler(connector));
}
}
}