com.crankuptheamps.client.TransportFactory Maven / Gradle / Ivy
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//
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// This computer software is owned by 60East Technologies Inc. and is
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package com.crankuptheamps.client;
import java.lang.Class;
import java.lang.reflect.Constructor;
import java.util.Hashtable;
import java.util.Properties;
import com.crankuptheamps.client.exception.TransportTypeException;
/**
* Factory class that allows you to register and unregister handler classes for various connection URI prefixes.
* Handler class is expected to create a transport when asked. Built-in transports such as "tcp" cannot be
* un-registered.
*/
public class TransportFactory
{
private static Hashtable registry= new Hashtable();
/**
* Registers a new {@link Transport} and URI prefix with the AMPS Client.
*
* @param name The URI prefix to register for this transport.
* @param className The name of the Java class to instantiate.
* @throws TransportTypeException Thrown when this transport type is already registered.
*/
public static void register(
String name,
String className) throws TransportTypeException
{
if(!registry.containsKey(name))
{
registry.put(name, className);
}
else
throw new TransportTypeException("'" + name + "' is already registered");
}
/**
* Unregisters a {@link Transport} from the AMPS client.
* Note: built-in transport types (e.g. 'tcp') cannot be unregistered.
*
* @param name The URI prefix to unregister.
* @throws TransportTypeException Thrown when this transport type has not been registered.
*/
public static void unregister(String name) throws TransportTypeException
{
if (registry.containsKey(name))
{
registry.remove(name);
}
else
{
throw new TransportTypeException("The TransportType '" + name + "' is not a known TransportType");
}
}
/**
* Resets self to the default state, unregistering any {@link Transport}s registered at runtime.
*
*/
public static void reset()
{
registry.clear();
}
/**
* Creates a {@link Transport} using the parameters provided.
* @param name A string which contains the name of the future Transport.
* @param messageType A parameter of type Protocol which contains the classification of the message.
* @param props A parameter of type Properties which contains the information about the message to be created.
* @return the newly-created {@link Transport}
* @throws TransportTypeException Thrown when the requested transport type cannot be constructed.
*/
public static Transport createTransport(
String name,
Protocol messageType,
Properties props) throws TransportTypeException
{
// Whoops, we don't have a Transport by this name in the registry,
// let's guess at the correct type by the name.
String tName = "com.crankuptheamps.client." + name.toUpperCase() + "Transport";
if (TransportFactory.registry.containsKey(name))
{
tName = TransportFactory.registry.get(name);
}
try
{
Class c = Class.forName(tName);
Class[] params = new Class[2];
params[0] = Protocol.class;
params[1] = Properties.class;
Constructor ctor = c.getConstructor(params);
Object[] args = new Object[2];
args[0] = messageType;
args[1] = props;
return (Transport)ctor.newInstance(args);
}
catch (java.lang.LinkageError e)
{
throw new TransportTypeException("The TransportType `" + name +
"' could not be loaded.", e);
}
catch(java.lang.NoSuchMethodException e)
{
throw new TransportTypeException("The TransportType '" + name +
"' could not be invoked.", e);
}
catch(java.lang.InstantiationException e)
{
throw new TransportTypeException("The TransportType '" + name +
"' could not be invoked.", e);
}
catch(java.lang.ClassNotFoundException e)
{
throw new TransportTypeException("The TransportType '" + name +
"' could not be found.", e);
}
catch(java.lang.reflect.InvocationTargetException e)
{
throw new TransportTypeException("The TransportType '" + name +
"' could not be invoked.", e);
}
catch(java.lang.IllegalAccessException e)
{
throw new TransportTypeException("The TransportType '" + name +
"' could not be invoked.", e);
}
catch(java.lang.SecurityException e)
{
throw new TransportTypeException("The TransportType '" + name +
"' could not be invoked.", e);
}
}
}