/**************************************************************************************
* Copyright (C) 2008 EsperTech, Inc. All rights reserved. *
* http://esper.codehaus.org *
* http://www.espertech.com *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the GPL license *
* a copy of which has been included with this distribution in the license.txt file. *
**************************************************************************************/
package com.espertech.esperio.http;
import com.espertech.esper.plugin.PluginLoader;
import com.espertech.esper.plugin.PluginLoaderInitContext;
import com.espertech.esperio.http.config.ConfigurationHTTPAdapter;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.io.File;
import java.net.URL;
public class EsperIOHTTPAdapterPlugin implements PluginLoader
{
private static Log log = LogFactory.getLog(EsperIOHTTPAdapterPlugin.class);
private static final String ESPERIO_HTTP_CONFIG_FILE = "esperio.http.configuration.file";
private EsperIOHTTPAdapter httpadapter;
private PluginLoaderInitContext context;
public void init(PluginLoaderInitContext context)
{
this.context = context;
}
public void postInitialize()
{
ConfigurationHTTPAdapter adapterConfig;
if (context.getConfigXml() != null) {
adapterConfig = fromXml(context.getConfigXml());
}
else {
adapterConfig = fromExternalFile();
}
log.info("Starting HTTP Adapter");
httpadapter = new EsperIOHTTPAdapter(adapterConfig, context.getEpServiceProvider().getURI());
httpadapter.start();
}
public void destroy()
{
if (httpadapter != null)
{
httpadapter.destroy();
}
httpadapter = null;
}
private ConfigurationHTTPAdapter fromXml(String xml) {
ConfigurationHTTPAdapter adapter = new ConfigurationHTTPAdapter();
return adapter.configureFromString(xml);
}
private ConfigurationHTTPAdapter fromExternalFile() {
// obtain config file name
String configFile = context.getProperties().getProperty(ESPERIO_HTTP_CONFIG_FILE);
if (configFile == null)
{
String message = "Required initialization property '" + ESPERIO_HTTP_CONFIG_FILE + "' is not provided";
log.error(message);
throw new RuntimeException(message);
}
// resolve config file
URL urlConfigFile;
try
{
urlConfigFile = resolveURL(configFile);
}
catch (Exception ex)
{
String message = "Error resolving config file from classpath or as a URL: " + ex.getMessage();
log.error(message, ex);
throw new RuntimeException(message, ex);
}
if (urlConfigFile == null)
{
String message = "Configuration file could not be resolved from '" + urlConfigFile + "'";
log.error(message);
throw new RuntimeException(message);
}
// parse config file
ConfigurationHTTPAdapter config = new ConfigurationHTTPAdapter();
try
{
config.configure(urlConfigFile);
}
catch (RuntimeException ex)
{
String message = "Configuration file read error for config file '" + urlConfigFile + "': " + ex.getMessage();
log.error(message, ex);
throw new RuntimeException(message, ex);
}
return config;
}
private URL resolveURL(String config) throws Exception
{
URL url = this.getClass().getClassLoader().getResource(config);
if (url != null)
{
return url;
}
url = Thread.currentThread().getContextClassLoader().getResource(config);
if (url != null)
{
return url;
}
File file = new File(config);
if (!file.isAbsolute()) {
String espereeBase = System.getProperty("esperee.base");
file = new File(espereeBase, config);
}
if (file.exists()) {
return file.toURI().toURL();
}
return new URL(config);
}
}