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| package com.sourceforge.jpatterns.core; |
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| import com.sourceforge.jpatterns.core.configuration.IPropertiesManager; |
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| import com.sourceforge.jpatterns.core.configuration.PropertiesBasedFactory; |
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| import com.sourceforge.jpatterns.core.configuration.exceptions.JPInitializationException; |
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| import com.zmicer.utils.InputArgumentUtils; |
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| import com.zmicer.utils.LoggingUtils; |
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| import org.apache.log4j.Logger; |
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| import java.io.Serializable; |
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| import java.util.HashMap; |
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| import java.util.Map; |
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| public final class JPEngineFactory implements Serializable |
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| { |
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| final public static Logger LOG = Logger.getLogger(JPEngineFactory.class); |
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| private static JPEngineFactory INSTANCE = null; |
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| private Map<JPConstants.EngineConfigCaregory, IJPEngine> m_engines = new HashMap<JPConstants.EngineConfigCaregory, IJPEngine>(); |
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| private JPEngineFactory()
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| { |
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| super();
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| init();
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| } |
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| public void init()
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| { |
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| final IJPEngine engine1 = instantiateEngine();
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| engine1.init(JPConstants.EngineConfigCaregory.CONSUMER);
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| m_engines.put(JPConstants.EngineConfigCaregory.CONSUMER, engine1);
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| final IJPEngine engine2 = instantiateEngine();
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| engine2.init(JPConstants.EngineConfigCaregory.FRAMEWORK);
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| m_engines.put(JPConstants.EngineConfigCaregory.FRAMEWORK, engine2);
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| } |
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| protected IJPEngine instantiateEngine()
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| { |
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| final IPropertiesManager propsManager = PropertiesBasedFactory.getInstance().getPropertiesManager();
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| if (null == propsManager)
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| throw new JPInitializationException("IPropertiesManager can not be null.");
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| } |
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| final Object objectEngine = propsManager.getBundledObject(IJPEngine.class);
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| if (null == objectEngine)
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| throw new JPInitializationException("Can not instantiate the IJPEngine implementation.");
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| } |
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| if (!(objectEngine instanceof IJPEngine))
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| { |
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| throw new JPInitializationException("Incorrect implemetation of the IJPEngine interface is set at the framework properties.");
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| } |
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| return (IJPEngine) objectEngine;
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| } |
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| public synchronized static JPEngineFactory getInstance()
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| if (null != INSTANCE)
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| return INSTANCE;
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| } |
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| try
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| { |
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| INSTANCE = new JPEngineFactory();
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| return INSTANCE;
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| } |
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| catch (Throwable ex) |
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| { |
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| LoggingUtils.logException(LOG, ex, null, JPEngineFactory.class);
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| throw new JPInitializationException("Cannot instantiate JPEngineFactory: " +ex.getMessage());
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| } |
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| } |
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| public static IJPEngine getJPEngine(JPConstants.EngineConfigCaregory category)
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| { |
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| InputArgumentUtils.checkObjects(category);
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| if (null == getInstance().m_engines.get(category))
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| logAndThrow("Can not obtain the IJPEngine of the category [" + category.toString() + "]");
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| } |
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| return getInstance().m_engines.get(category);
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| } |
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| protected static void logAndThrow(final String message) throws JPInitializationException
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| InputArgumentUtils.checkStrings(true, message);
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| LoggingUtils.error(LOG, JPEngineFactory.class, message);
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| throw new JPInitializationException(message);
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| } |
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| } |