org.jgroups.conf

Class ClassConfigurator

java.lang.Object

org.jgroups.conf.ClassConfigurator

public class ClassConfigurator
extends java.lang.Object

This class will be replaced with the class that read info from the magic number configurator that reads info from the xml file. The name and the relative path of the magic number map file can be specified as value of the property org.jgroups.conf.magicNumberFile. It must be relative to one of the classpath elements, to allow the classloader to locate the file. If a value is not specified, MagicNumberReader.MAGIC_NUMBER_FILE is used, which defaults to "jg-magic-map.xml".

Author:

Filip Hanik, Bela Ban

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	MAGIC_NUMBER_FILE
static java.lang.String	PROTOCOL_ID_FILE

Constructor Summary

Constructors

Constructor and Description
ClassConfigurator()

Method Summary

Modifier and Type	Method and Description
static void	add(short magic, java.lang.Class clazz) Method to register a user-defined header with jg-magic-map at runtime
static void	addProtocol(short id, java.lang.Class protocol)
static java.lang.Class<?>	get(short magic) Returns a class for a magic number.
static java.lang.Class	get(java.lang.String clazzname)
static java.lang.Class	get(java.lang.String clazzname, java.lang.ClassLoader loader) Loads and returns the class from the class name
static short	getMagicNumber(java.lang.Class clazz) Returns the magic number for the class.
static java.lang.Class	getProtocol(short id)
static short	getProtocolId(java.lang.Class protocol)
protected static void	init()
protected static java.util.List<Triple<java.lang.Short,java.lang.String,java.lang.Boolean>>	parse(java.io.InputStream stream)
protected static Triple<java.lang.Short,java.lang.String,java.lang.Boolean>	parseClassData(org.w3c.dom.Node protocol)
static java.lang.String	printClassMap()
static java.lang.String	printMagicMap()
protected static java.util.List<Triple<java.lang.Short,java.lang.String,java.lang.Boolean>>	readMappings(java.lang.String name) try to read the magic number configuration file as a Resource form the classpath using getResourceAsStream if this fails this method tries to read the configuration file from mMagicNumberFile using a FileInputStream (not in classpath but somewhere else in the disk)
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

MAGIC_NUMBER_FILE

public static final java.lang.String MAGIC_NUMBER_FILE

See Also:

Constant Field Values

PROTOCOL_ID_FILE

public static final java.lang.String PROTOCOL_ID_FILE

See Also:

Constant Field Values

Constructor Detail

ClassConfigurator

public ClassConfigurator()

Method Detail

init

protected static void init()
                    throws java.lang.Exception

Throws:

java.lang.Exception

add

public static void add(short magic,
                       java.lang.Class clazz)
                throws java.lang.IllegalArgumentException

Method to register a user-defined header with jg-magic-map at runtime

Parameters:

magic - The magic number. Needs to be > 1024

clazz - The class. Usually a subclass of Header

Throws:

java.lang.IllegalArgumentException - If the magic number is already taken, or the magic number is <= 1024

addProtocol

public static void addProtocol(short id,
                               java.lang.Class protocol)

get

public static java.lang.Class<?> get(short magic)

Returns a class for a magic number. Returns null if no class is found

Parameters:

magic - the magic number that maps to the class

Returns:

a Class object that represents a class that implements java.io.Externalizable

get

public static java.lang.Class get(java.lang.String clazzname,
                                  java.lang.ClassLoader loader)
                           throws java.lang.ClassNotFoundException

Loads and returns the class from the class name

Parameters:

clazzname - a fully classified class name to be loaded

Returns:

a Class object that represents a class that implements java.io.Externalizable

Throws:

java.lang.ClassNotFoundException

get

public static java.lang.Class get(java.lang.String clazzname)
                           throws java.lang.ClassNotFoundException

Throws:

java.lang.ClassNotFoundException

getMagicNumber

public static short getMagicNumber(java.lang.Class clazz)

Returns the magic number for the class.

Parameters:

clazz - a class object that we want the magic number for

Returns:

the magic number for a class, -1 if no mapping is available

getProtocolId

public static short getProtocolId(java.lang.Class protocol)

getProtocol

public static java.lang.Class getProtocol(short id)

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

printMagicMap

public static java.lang.String printMagicMap()

printClassMap

public static java.lang.String printClassMap()

readMappings

protected static java.util.List<Triple<java.lang.Short,java.lang.String,java.lang.Boolean>> readMappings(java.lang.String name)
                                                                                                  throws java.lang.Exception

try to read the magic number configuration file as a Resource form the classpath using getResourceAsStream if this fails this method tries to read the configuration file from mMagicNumberFile using a FileInputStream (not in classpath but somewhere else in the disk)

Returns:

an array of ClassMap objects that where parsed from the file (if found) or an empty array if file not found or had en exception

Throws:

java.lang.Exception

parse

protected static java.util.List<Triple<java.lang.Short,java.lang.String,java.lang.Boolean>> parse(java.io.InputStream stream)
                                                                                           throws java.lang.Exception

Throws:

java.lang.Exception

parseClassData

protected static Triple<java.lang.Short,java.lang.String,java.lang.Boolean> parseClassData(org.w3c.dom.Node protocol)