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* Copyright (c) quickfixengine.org All rights reserved.
*
* This file is part of the QuickFIX FIX Engine
*
* This file may be distributed under the terms of the quickfixengine.org
* license as defined by quickfixengine.org and appearing in the file
* LICENSE included in the packaging of this file.
*
* This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING
* THE WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE.
*
* See http://www.quickfixengine.org/LICENSE for licensing information.
*
* Contact [email protected] if any conditions of this licensing
* are not clear to you.
******************************************************************************/
package quickfix;
import static quickfix.FixVersions.*;
import quickfix.field.MsgType;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* The default factory for creating FIX message instances.
*/
public class DefaultMessageFactory implements MessageFactory {
private final Map messageFactories
= new ConcurrentHashMap();
/**
* Constructs a DefaultMessageFactory, which dynamically loads and delegates to
* the default version-specific message factories, if they are available at runtime.
*
* Callers can set the {@link Thread#setContextClassLoader context classloader},
* which will be used to load the classes if {@link Class#forName Class.forName}
* fails to do so (e.g. in an OSGi environment).
*/
public DefaultMessageFactory() {
// To loosen the coupling between this factory and generated code, the
// message factories are discovered at run time using reflection
addFactory(BEGINSTRING_FIX40);
addFactory(BEGINSTRING_FIX41);
addFactory(BEGINSTRING_FIX42);
addFactory(BEGINSTRING_FIX43);
addFactory(BEGINSTRING_FIX44);
addFactory(BEGINSTRING_FIXT11);
addFactory(FIX50);
addFactory(FIX50SP1);
addFactory(FIX50SP2);
}
private void addFactory(String beginString) {
String packageVersion = beginString.replace(".", "").toLowerCase();
try {
addFactory(beginString, "quickfix." + packageVersion + ".MessageFactory");
} catch (ClassNotFoundException e) {
// ignore - this factory is not available
}
}
/**
* Adds a factory of the given class, which will be delegated to for creating
* Message instances from messages with the given begin string.
*
* Callers can set the {@link Thread#setContextClassLoader context classloader},
* which will be used to load the classes if {@link Class#forName Class.forName}
* fails to do so (e.g. in an OSGi environment).
*
* @param beginString the begin string whose messages will be delegated to the factory
* @param factoryClassName the name of the factory class to instantiate and add
* @throws ClassNotFoundException if the named factory class cannot be found
* @throws RuntimeException if the named factory class cannot be instantiated
*/
@SuppressWarnings("unchecked")
public void addFactory(String beginString, String factoryClassName) throws ClassNotFoundException {
// try to load the class
Class factoryClass = null;
try {
// try using our own classloader
factoryClass = (Class) Class.forName(factoryClassName);
} catch (ClassNotFoundException e) {
// try using context classloader (i.e. allow caller to specify it)
Thread.currentThread().getContextClassLoader().loadClass(factoryClassName);
}
// if factory is found, add it
if (factoryClass != null) {
addFactory(beginString, factoryClass);
}
}
/**
* Adds a factory of the given class, which will be delegated to for creating
* Message instances from messages with the given begin string.
*
* @param beginString the begin string whose messages will be delegated to the factory
* @param factoryClass the class of the factory to instantiate and add
* @throws RuntimeException if the given factory class cannot be instantiated
*/
public void addFactory(String beginString, Class factoryClass) {
try {
MessageFactory factory = factoryClass.newInstance();
messageFactories.put(beginString, factory);
} catch (Exception e) {
throw new RuntimeException("can't instantiate " + factoryClass.getName(), e);
}
}
public Message create(String beginString, String msgType) {
MessageFactory messageFactory = messageFactories.get(beginString);
if (beginString.equals(BEGINSTRING_FIXT11)) {
// The default message factory assumes that only FIX 5.0 will be
// used with FIXT 1.1 sessions. A more flexible approach will require
// an extension to the QF JNI API. Until then, you will need a custom
// message factory if you want to use application messages prior to
// FIX 5.0 with a FIXT 1.1 session.
//
// TODO: how do we support 50/50SP1/50SP2 concurrently?
//
// If you need to determine admin message category based on a data
// dictionary, then use a custom message factory and don't use the
// static method used below.
if (!MessageUtils.isAdminMessage(msgType)) {
messageFactory = messageFactories.get(FIX50);
}
}
if (messageFactory != null) {
return messageFactory.create(beginString, msgType);
}
Message message = new Message();
message.getHeader().setString(MsgType.FIELD, msgType);
return message;
}
public Group create(String beginString, String msgType, int correspondingFieldID) {
MessageFactory messageFactory = messageFactories.get(beginString);
if (messageFactory != null) {
return messageFactory.create(beginString, msgType, correspondingFieldID);
}
throw new IllegalArgumentException("Unsupported FIX version: " + beginString);
}
}