com.zeroc.Ice.PluginManagerI Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of ice Show documentation
Show all versions of ice Show documentation
Ice is a comprehensive RPC framework that helps you build distributed applications with minimal effort using familiar object-oriented idioms
//
// Copyright (c) ZeroC, Inc. All rights reserved.
//
package com.zeroc.Ice;
import java.net.URLEncoder;
public final class PluginManagerI implements PluginManager
{
private static String _kindOfObject = "plugin";
@Override
public synchronized void
initializePlugins()
{
if(_initialized)
{
InitializationException ex = new InitializationException();
ex.reason = "plug-ins already initialized";
throw ex;
}
//
// Invoke initialize() on the plug-ins, in the order they were loaded.
//
java.util.List initializedPlugins = new java.util.ArrayList<>();
try
{
for(PluginInfo p : _plugins)
{
try
{
p.plugin.initialize();
}
catch(PluginInitializationException ex)
{
throw ex;
}
catch(RuntimeException ex)
{
PluginInitializationException e = new PluginInitializationException();
e.reason = "plugin `" + p.name + "' initialization failed";
e.initCause(ex);
throw e;
}
initializedPlugins.add(p.plugin);
}
}
catch(RuntimeException ex)
{
//
// Destroy the plug-ins that have been successfully initialized, in the
// reverse order.
//
java.util.ListIterator i = initializedPlugins.listIterator(initializedPlugins.size());
while(i.hasPrevious())
{
Plugin p = i.previous();
try
{
p.destroy();
}
catch(RuntimeException e)
{
// Ignore.
}
}
throw ex;
}
_initialized = true;
}
@Override
public synchronized String[]
getPlugins()
{
java.util.ArrayList names = new java.util.ArrayList<>();
for(PluginInfo p : _plugins)
{
names.add(p.name);
}
return names.toArray(new String[0]);
}
@Override
public synchronized Plugin
getPlugin(String name)
{
if(_communicator == null)
{
throw new CommunicatorDestroyedException();
}
Plugin p = findPlugin(name);
if(p != null)
{
return p;
}
NotRegisteredException ex = new NotRegisteredException();
ex.id = name;
ex.kindOfObject = _kindOfObject;
throw ex;
}
@Override
public synchronized void
addPlugin(String name, Plugin plugin)
{
if(_communicator == null)
{
throw new CommunicatorDestroyedException();
}
if(findPlugin(name) != null)
{
AlreadyRegisteredException ex = new AlreadyRegisteredException();
ex.id = name;
ex.kindOfObject = _kindOfObject;
throw ex;
}
PluginInfo info = new PluginInfo();
info.name = name;
info.plugin = plugin;
_plugins.add(info);
}
@Override
public synchronized void
destroy()
{
if(_communicator != null)
{
if(_initialized)
{
java.util.ListIterator i = _plugins.listIterator(_plugins.size());
while(i.hasPrevious())
{
PluginInfo p = i.previous();
try
{
p.plugin.destroy();
}
catch(RuntimeException ex)
{
Util.getProcessLogger().warning("unexpected exception raised by plug-in `" +
p.name + "' destruction:\n" + ex.toString());
}
}
}
_communicator = null;
}
_plugins.clear();
if(_classLoaders != null)
{
_classLoaders.clear();
}
}
public PluginManagerI(Communicator communicator, com.zeroc.IceInternal.Instance instance)
{
_communicator = communicator;
_instance = instance;
_initialized = false;
}
public String[] loadPlugins(String[] cmdArgs)
{
assert(_communicator != null);
//
// Load and initialize the plug-ins defined in the property set
// with the prefix "Ice.Plugin.". These properties should
// have the following format:
//
// Ice.Plugin.name[.]=entry_point [args]
//
// If the Ice.PluginLoadOrder property is defined, load the
// specified plug-ins in the specified order, then load any
// remaining plug-ins.
//
final String prefix = "Ice.Plugin.";
Properties properties = _communicator.getProperties();
java.util.Map plugins = properties.getPropertiesForPrefix(prefix);
final String[] loadOrder = properties.getPropertyAsList("Ice.PluginLoadOrder");
for(String name : loadOrder)
{
if(findPlugin(name) != null)
{
PluginInitializationException ex = new PluginInitializationException();
ex.reason = "plug-in `" + name + "' already loaded";
throw ex;
}
String key = "Ice.Plugin." + name + ".java";
boolean hasKey = plugins.containsKey(key);
if(hasKey)
{
plugins.remove("Ice.Plugin." + name);
}
else
{
key = "Ice.Plugin." + name;
hasKey = plugins.containsKey(key);
}
if(hasKey)
{
final String value = plugins.get(key);
cmdArgs = loadPlugin(name, value, cmdArgs);
plugins.remove(key);
}
else
{
PluginInitializationException ex = new PluginInitializationException();
ex.reason = "plug-in `" + name + "' not defined";
throw ex;
}
}
//
// Load any remaining plug-ins that weren't specified in PluginLoadOrder.
//
while(!plugins.isEmpty())
{
java.util.Iterator > p = plugins.entrySet().iterator();
java.util.Map.Entry entry = p.next();
String name = entry.getKey().substring(prefix.length());
int dotPos = name.lastIndexOf('.');
if(dotPos != -1)
{
String suffix = name.substring(dotPos + 1);
if(suffix.equals("cpp") || suffix.equals("clr"))
{
//
// Ignored
//
p.remove();
}
else if(suffix.equals("java"))
{
name = name.substring(0, dotPos);
cmdArgs = loadPlugin(name, entry.getValue(), cmdArgs);
p.remove();
//
// Don't want to load this one if it's there!
//
plugins.remove("Ice.Plugin." + name);
}
else
{
//
// Name is just a regular name that happens to contain a dot
//
dotPos = -1;
}
}
if(dotPos == -1)
{
//
// Is there a .java entry?
//
String value = entry.getValue();
p.remove();
String javaValue = plugins.remove("Ice.Plugin." + name + ".java");
if(javaValue != null)
{
value = javaValue;
}
cmdArgs = loadPlugin(name, value, cmdArgs);
}
}
return cmdArgs;
}
private String[] loadPlugin(String name, String pluginSpec, String[] cmdArgs)
{
assert(_communicator != null);
//
// We support the following formats:
//
// [args]
// : [args]
// : [args]
// "": [args]
// ":" [args]
//
String[] args;
try
{
args = com.zeroc.IceUtilInternal.Options.split(pluginSpec);
}
catch(com.zeroc.IceUtilInternal.Options.BadQuote ex)
{
throw new PluginInitializationException("invalid arguments for plug-in `" + name + "':\n" +
ex.getMessage());
}
assert(args.length > 0);
final String entryPoint = args[0];
final boolean isWindows = System.getProperty("os.name").startsWith("Windows");
boolean absolutePath = false;
//
// Find first ':' that isn't part of the file path.
//
int pos = entryPoint.indexOf(':');
if(isWindows)
{
final String driveLetters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
if(pos == 1 && entryPoint.length() > 2 && driveLetters.indexOf(entryPoint.charAt(0)) != -1 &&
(entryPoint.charAt(2) == '\\' || entryPoint.charAt(2) == '/'))
{
absolutePath = true;
pos = entryPoint.indexOf(':', pos + 1);
}
if(!absolutePath)
{
absolutePath = entryPoint.startsWith("\\\\");
}
}
else
{
absolutePath = entryPoint.startsWith("/");
}
if((pos == -1 && absolutePath) || (pos != -1 && entryPoint.length() <= pos + 1))
{
//
// Class name is missing.
//
throw new PluginInitializationException("invalid entry point for plug-in `" + name + "':\n" + entryPoint);
}
//
// Extract the JAR file or subdirectory, if any.
//
String classDir = null; // Path name of JAR file or subdirectory.
String className;
if(pos == -1)
{
className = entryPoint;
}
else
{
classDir = entryPoint.substring(0, pos).trim();
className = entryPoint.substring(pos + 1).trim();
}
//
// Shift the arguments.
//
String[] tmp = new String[args.length - 1];
System.arraycopy(args, 1, tmp, 0, args.length - 1);
args = tmp;
//
// Convert command-line options into properties. First we
// convert the options from the plug-in configuration, then
// we convert the options from the application command-line.
//
Properties properties = _communicator.getProperties();
args = properties.parseCommandLineOptions(name, args);
cmdArgs = properties.parseCommandLineOptions(name, cmdArgs);
//
// Instantiate the class.
//
PluginFactory pluginFactory = null;
try
{
Class c = null;
//
// Use a class loader if the user specified a JAR file or class directory.
//
if(classDir != null)
{
try
{
if(!absolutePath)
{
classDir = new java.io.File(System.getProperty("user.dir") + java.io.File.separator +
classDir).getCanonicalPath();
}
if(!classDir.endsWith(java.io.File.separator) && !classDir.toLowerCase().endsWith(".jar"))
{
classDir += java.io.File.separator;
}
classDir = URLEncoder.encode(classDir, "UTF-8");
//
// Reuse an existing class loader if we have already loaded a plug-in with
// the same value for classDir, otherwise create a new one.
//
ClassLoader cl = null;
if(_classLoaders == null)
{
_classLoaders = new java.util.HashMap<>();
}
else
{
cl = _classLoaders.get(classDir);
}
if(cl == null)
{
final java.net.URL[] url = new java.net.URL[] { new java.net.URL("file", null, classDir) };
//
// Use the custom class loader (if any) as the parent.
//
if(_instance.initializationData().classLoader != null)
{
cl = new java.net.URLClassLoader(url, _instance.initializationData().classLoader);
}
else
{
cl = new java.net.URLClassLoader(url);
}
_classLoaders.put(classDir, cl);
}
c = cl.loadClass(className);
}
catch(java.net.MalformedURLException ex)
{
throw new PluginInitializationException("invalid entry point format `" + pluginSpec + "'", ex);
}
catch(java.io.IOException ex)
{
throw new PluginInitializationException("invalid path in entry point `" + pluginSpec + "'", ex);
}
catch(java.lang.ClassNotFoundException ex)
{
// Ignored
}
}
else
{
c = com.zeroc.IceInternal.Util.getInstance(_communicator).findClass(className);
}
if(c == null)
{
throw new PluginInitializationException("class " + className + " not found");
}
java.lang.Object obj = c.getDeclaredConstructor().newInstance();
try
{
pluginFactory = (PluginFactory)obj;
}
catch(ClassCastException ex)
{
throw new PluginInitializationException("class " + className + " does not implement PluginFactory",
ex);
}
}
catch(NoSuchMethodException ex)
{
throw new PluginInitializationException("unable to instantiate class " + className, ex);
}
catch(java.lang.reflect.InvocationTargetException ex)
{
throw new PluginInitializationException("unable to instantiate class " + className, ex);
}
catch(IllegalAccessException ex)
{
throw new PluginInitializationException("unable to access default constructor in class " + className, ex);
}
catch(InstantiationException ex)
{
throw new PluginInitializationException("unable to instantiate class " + className, ex);
}
//
// Invoke the factory.
//
Plugin plugin = null;
try
{
plugin = pluginFactory.create(_communicator, name, args);
}
catch(PluginInitializationException ex)
{
throw ex;
}
catch(Throwable ex)
{
throw new PluginInitializationException("exception in factory " + className, ex);
}
if(plugin == null)
{
throw new PluginInitializationException("failure in factory " + className);
}
PluginInfo info = new PluginInfo();
info.name = name;
info.plugin = plugin;
_plugins.add(info);
return cmdArgs;
}
private Plugin findPlugin(String name)
{
for(PluginInfo p : _plugins)
{
if(name.equals(p.name))
{
return p.plugin;
}
}
return null;
}
static class PluginInfo
{
String name;
Plugin plugin;
}
private Communicator _communicator;
private com.zeroc.IceInternal.Instance _instance;
private java.util.List _plugins = new java.util.ArrayList<>();
private boolean _initialized;
private java.util.Map _classLoaders;
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy