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A library containing the JQM engine. Cannot be used alone.
/**
* Copyright © 2013 enioka. All rights reserved
* Authors: Marc-Antoine GOUILLART ([email protected])
* Pierre COPPEE ([email protected])
*
* 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 com.enioka.jqm.tools;
import java.io.File;
import java.lang.management.ManagementFactory;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.rmi.Remote;
import java.rmi.registry.Registry;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.List;
import java.util.Map;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import javax.naming.CompositeName;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.Name;
import javax.naming.NameParser;
import javax.naming.NamingException;
import javax.naming.spi.InitialContextFactory;
import javax.naming.spi.InitialContextFactoryBuilder;
import javax.naming.spi.NamingManager;
import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
/**
* This class implements a basic JNDI context
*
*/
class JndiContext extends InitialContext implements InitialContextFactoryBuilder, InitialContextFactory, NameParser
{
private static Logger jqmlogger = Logger.getLogger(JndiContext.class);
private Map singletons = new HashMap();
private List jmxNames = new ArrayList();
private Registry r = null;
private ClassLoader extResources;
/**
* Will create a JNDI Context and register it as the initial context factory builder
*
* @return the context
* @throws NamingException
* on any issue during initial context factory builder registration
*/
static JndiContext createJndiContext() throws NamingException
{
try
{
if (!NamingManager.hasInitialContextFactoryBuilder())
{
JndiContext ctx = new JndiContext();
NamingManager.setInitialContextFactoryBuilder(ctx);
return ctx;
}
else
{
return (JndiContext) NamingManager.getInitialContext(null);
}
}
catch (Exception e)
{
jqmlogger.error("Could not create JNDI context: " + e.getMessage());
NamingException ex = new NamingException("Could not initialize JNDI Context");
ex.setRootCause(e);
throw ex;
}
}
/**
* Create a new Context
*
* @throws NamingException
*/
private JndiContext() throws NamingException
{
super();
// List all jars inside ext directory
File extDir = new File("ext/");
List urls = new ArrayList();
if (extDir.isDirectory())
{
for (File f : extDir.listFiles())
{
if (!f.canRead())
{
throw new NamingException("can't access file " + f.getAbsolutePath());
}
try
{
urls.add(f.toURI().toURL());
}
catch (MalformedURLException e)
{
jqmlogger.error("Error when parsing the content of ext directory. File will be ignored", e);
}
}
// Create classloader
final URL[] aUrls = urls.toArray(new URL[0]);
for (URL u : aUrls)
{
jqmlogger.trace(u.toString());
}
extResources = AccessController.doPrivileged(new PrivilegedAction()
{
@Override
public URLClassLoader run()
{
return new URLClassLoader(aUrls, null);
}
});
}
else
{
throw new NamingException("JQM_ROOT/ext directory does not exist or cannot be read");
}
}
@Override
public Object lookup(String name) throws NamingException
{
if (name == null)
{
throw new IllegalArgumentException("name cannot be null");
}
jqmlogger.trace("Looking up a JNDI element named " + name);
// Special delegated cases
if (name.startsWith("rmi:"))
{
try
{
return this.r.lookup(name.split("/")[3]);
}
catch (Exception e)
{
NamingException e1 = new NamingException();
e1.setRootCause(e);
throw e1;
}
}
if (name.endsWith("serverName"))
{
return JqmEngine.latestNodeStartedName;
}
// If in cache...
if (singletons.containsKey(name))
{
jqmlogger.trace("JNDI element named " + name + " found in cache.");
return singletons.get(name);
}
// Retrieve the resource description from the database or the XML file
JndiResourceDescriptor d = ResourceParser.getDescriptor(name);
jqmlogger.trace("JNDI element named " + name + " not found in cache. Will be created. Singleton status: " + d.isSingleton());
// Singleton handling is synchronized to avoid double creation
if (d.isSingleton())
{
synchronized (singletons)
{
if (singletons.containsKey(name))
{
return singletons.get(name);
}
// We use the current thread loader to find the resource and resource factory class - ext is inside that CL.
// This is done only for payload CL - engine only need ext, not its own CL (as its own CL does NOT include ext).
Object res = null;
try
{
ResourceFactory rf = new ResourceFactory(
Thread.currentThread().getContextClassLoader() instanceof com.enioka.jqm.tools.JarClassLoader ? Thread
.currentThread().getContextClassLoader() : extResources);
res = rf.getObjectInstance(d, null, this, new Hashtable());
}
catch (Exception e)
{
jqmlogger.warn("Could not instanciate singleton JNDI object resource " + name, e);
NamingException ex = new NamingException(e.getMessage());
ex.initCause(e);
throw ex;
}
// Cache result
if (res.getClass().getClassLoader() instanceof JarClassLoader)
{
jqmlogger
.warn("A JNDI resource was defined as singleton but was loaded by a payload class loader - it won't be cached to avoid class loader leaks");
}
else
{
singletons.put(name, res);
// Pool JMX registration (only if cached - avoids leaks)
if ("org.apache.tomcat.jdbc.pool.DataSourceFactory".equals(d.getFactoryClassName())
&& (d.get("jmxEnabled") == null ? true : Boolean.parseBoolean((String) d.get("jmxEnabled").getContent())))
{
try
{
MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
ObjectName jmxname = new ObjectName("com.enioka.jqm:type=JdbcPool,name=" + name);
mbs.registerMBean(
res.getClass().getMethod("getPool").invoke(res).getClass().getMethod("getJmxPool")
.invoke(res.getClass().getMethod("getPool").invoke(res)), jmxname);
jmxNames.add(jmxname);
}
catch (Exception e)
{
jqmlogger.warn("Could not register JMX MBean for resource.", e);
}
}
}
// Done
return res;
}
}
// Non singleton
try
{
// We use the current thread loader to find the resource and resource factory class - ext is inside that CL.
// This is done only for payload CL - engine only need ext, not its own CL (as its own CL does NOT include ext).
ResourceFactory rf = new ResourceFactory(
Thread.currentThread().getContextClassLoader() instanceof com.enioka.jqm.tools.JarClassLoader ? Thread.currentThread()
.getContextClassLoader() : extResources);
return rf.getObjectInstance(d, null, this, new Hashtable());
}
catch (Exception e)
{
jqmlogger.warn("Could not instanciate JNDI object resource " + name, e);
NamingException ex = new NamingException(e.getMessage());
ex.initCause(e);
throw ex;
}
}
void resetSingletons()
{
jqmlogger.info("Resetting singleton JNDI resource cache");
MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
for (ObjectName n : this.jmxNames)
{
try
{
mbs.unregisterMBean(n);
}
catch (Exception e)
{
jqmlogger.error("could not unregister bean", e);
}
}
this.jmxNames = new ArrayList();
this.singletons = new HashMap();
}
@Override
public Object lookup(Name name) throws NamingException
{
return this.lookup(StringUtils.join(Collections.list(name.getAll()), "/"));
}
@Override
public Context getInitialContext(Hashtable environment) throws NamingException
{
return this;
}
@Override
public InitialContextFactory createInitialContextFactory(Hashtable environment) throws NamingException
{
return this;
}
@Override
public NameParser getNameParser(String name) throws NamingException
{
return this;
}
@Override
public Name parse(String name) throws NamingException
{
return new CompositeName(name);
}
@Override
public void close() throws NamingException
{
// Nothing to do.
}
@Override
public void bind(String name, Object obj) throws NamingException
{
jqmlogger.debug("binding [" + name + "] to a [" + obj.getClass().getCanonicalName() + "]");
if (r != null && name.startsWith("rmi://"))
{
try
{
jqmlogger.debug("binding [" + name.split("/")[3] + "] to a [" + obj.getClass().getCanonicalName() + "]");
this.r.bind(name.split("/")[3], (Remote) obj);
}
catch (Exception e)
{
NamingException e1 = new NamingException("could not bind RMI object");
e1.setRootCause(e);
throw e1;
}
}
else
{
this.singletons.put(name, obj);
}
}
@Override
public void bind(Name name, Object obj) throws NamingException
{
this.bind(StringUtils.join(Collections.list(name.getAll()), "/"), obj);
}
/**
* Will register the given Registry as a provider for the RMI: context. If there is already a registered Registry, the call is ignored.
*
* @param r
*/
void registerRmiContext(Registry r)
{
if (this.r == null)
{
this.r = r;
}
}
/**
* @return the class loader holding the ext directory (or null if no ext directory - should never happen)
*/
ClassLoader getExtCl()
{
return this.extResources;
}
@Override
public void unbind(Name name) throws NamingException
{
this.unbind(StringUtils.join(Collections.list(name.getAll()), "/"));
}
@Override
public void unbind(String name) throws NamingException
{
if (r != null && name.startsWith("rmi://"))
{
try
{
jqmlogger.debug("unbinding RMI name " + name);
this.r.unbind(name.split("/")[3]);
}
catch (Exception e)
{
NamingException e1 = new NamingException("could not unbind RMI name");
e1.setRootCause(e);
throw e1;
}
}
else
{
this.singletons.remove(name);
}
}
}