dev 契约锁

P15GEN2\59518

2024-05-29 d4210c7c4b04abde20037ea8aa0f54ef8a2649aa

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package foundation.handler;
 
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
 
import javax.servlet.http.HttpServletResponse;
 
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
 
import foundation.handler.envelop.EnvelopWriter;
import foundation.route.Operation;
 
 
public abstract class BaseHandler extends MethodPublisher implements IHandler {
 
    protected static Logger logger; 
    
    static {
        logger = LogManager.getLogger(Handler.class);
    }
    
    public BaseHandler() {
 
    }
    
    public void receive(Operation operation, DataPool dataPool, HttpServletResponse response) throws Exception {
        //1. create pool and writer
        ResultPool resultPool = new ResultPool(response);
        
        try {
            EnvelopWriter writer = new EnvelopWriter(response);
            
            //2. before execute
            boolean proceed = beforeDispatch(operation, dataPool, resultPool);
                
            //3. execute
            if (proceed) {
                dispatch(operation, dataPool, resultPool);
            }
 
            //4. flush
            if (resultPool.isFireReplay()) {
                writer.replay(resultPool);
                writer.flush();
            }            
        }
        finally {
            resultPool.free();
        }
    }
    
    protected boolean beforeDispatch(Operation operator, DataPool dataPool, ResultPool resultPool) throws Exception {
        return true;
    }
    
    protected void dispatch(Operation operator, DataPool dataPool, ResultPool resultPool) throws Exception {
        String methodName = operator.getOperator();
        Method method = methodMap.get(methodName);
        
        if (method == null) {
            logger.error("method exec error: {} not exists", methodName);
            return;
        }
        
        try {
            invokeMethod(method, dataPool, resultPool);
        }
        catch (InvocationTargetException e) {
            e.printStackTrace();
            Throwable throwable = e.getTargetException();
 
            if (throwable == null) {
                throw e;
            }
            else {
                throw (Exception) throwable;
            }
        }
    }
    
    protected abstract void invokeMethod(Method method, DataPool dataPool, ResultPool resultPool) throws Exception;
    
    protected void onError(Exception e) throws Exception {
        logger.error(e);
        
        if (logger.isTraceEnabled()) {
            e.printStackTrace();
        }
    }
 
}