公司的一個專案，覺得這個設計挺有意思的，記錄下來，可能日後會用到。

只記錄了大概的一些具有代表性的程式碼，因修改過公司的包名等一些敏感性的關鍵字，可能class或者Interface有些錯誤,但不影響理解。

<!--門票類的呼叫。從這個bean入手理解設計模式 -->
<bean id="aCompanyTicketInvoker" class="com.neil.util.ServiceRebootableProxy"
		factory-method="getInstance">
		<constructor-arg index="0"
			ref="servicesRebootable" />
		<constructor-arg index="1">
			<value>com.neil.ticket.ACompanyTicketInvoker</value>
		</constructor-arg>
</bean>
<bean id="bCompanyTicketInvoker" class="com.neil.util.ServiceRebootableProxy"
		factory-method="getInstance">
		<constructor-arg index="0"
			ref="servicesRebootable" />
		<constructor-arg index="1">
			<value>com.neil.ticket.BCompanyTicketInvoker</value>
		</constructor-arg>
</bean>
 

package com.neil;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

public class ServiceRebootableProxy implements InvocationHandler {
    private ServiceRebootable serviceRebootable;
    private Class targetClass;

    public void setServiceRebootable(ServiceRebootable serviceRebootable) {
	this.serviceRebootable = serviceRebootable;
    }

    public void setTargetClass(Class targetClass) {
	this.targetClass = targetClass;
    }

    public static <T> T getInstance(ServiceRebootable rebootable, Class<T> targetClass) {
	ServiceRebootableProxy proxy = new ServiceRebootableProxy();
	proxy.setServiceRebootable(rebootable);
	proxy.setTargetClass(targetClass);
	Class[] interfaces = null;
	if (targetClass.isInterface()) {
	    interfaces = new Class[] { targetClass };
	} else {
	    interfaces = targetClass.getInterfaces();
	}
	return (T) Proxy.newProxyInstance(targetClass.getClassLoader(), interfaces, proxy);
    }

    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
	try {
	    Object obj = serviceRebootable.get(targetClass);
	    if (obj == null) {
		obj = serviceRebootable.create(targetClass);
	    }
	    return method.invoke(obj, args);
	} catch (Throwable ex) {
	    serviceRebootable.destroy(targetClass);
	    throw ex.getCause();
	}
    }

}








<bean id="servicesRebootable" class="com.neil.util.CommonServiceRebootable">
		<property name="services">
			<list>	
				<bean class="com.neil.ticket.BCompanyTicketInvoker">
					<property name="url" value="${BCompany.url}" />
					<property name="username" value="${BCompany.username}"/>
					<property name="password" value="${BCompany.password}"/>
				</bean>
				
				<bean class="com.neil.ticket.ACompanyTicketInvoker">
					<property name="agentId" value="${ACompany.agentId}"/>
					<property name="secretAuthenticationKey" value="${ACompany.secretAuthenticationKey}"/>
					<property name="providerDomainName" value="${ACompany.providerDomainName}"/>
				</bean>
			</list>
		</property>
</bean>


==========================================


package com.neil.util;

public interface ServiceRebootable {

    Object get(Class clazz);

    Object create(Class clazz);

    void destroy(Class clazz);

}



==========================================



package com.neil.util;

import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class CommonServiceRebootable implements ServiceRebootable {
    private Map<Class, Object> serviceMap = Collections.synchronizedMap(new HashMap<Class, Object>());
    private List<Initializable> services;
    private Logger log = LoggerFactory.getLogger(this.getClass());

    public void setServices(List<Initializable> services) {
	this.services = services;
    }

    public Object create(Class clazz) {
	Initializable s = find(clazz);
	s.init();
	serviceMap.put(clazz, s);
	log.info(s.getClass().getCanonicalName() + "建立");
	return s;
    }

    public void destroy(Class clazz) {
	Initializable s = (Initializable) serviceMap.remove(clazz);
	if (s != null) {
	    s.destroy();
	    log.info(s.getClass().getCanonicalName() + "銷燬");
	}
    }

    public Object get(Class clazz) {
	return serviceMap.get(clazz);
    }

    private Initializable find(Class clazz) {
	for (Initializable s : services) {
	    if (s.getClass().equals(clazz)) {
		return s;
	    }
	}
	log.error("找不到類" + clazz + "的例項");
	return null;
    }
}




==========================================



package com.neil.ticket;


public class ACompanyTicketInvoker extends AbstractTicketInvoker implements TicketInvoker, Initializable {
	
	private Logger log = LoggerFactory.getLogger(this.getClass());
	
	private String agentId;
	private String secretAuthenticationKey;
	private String providerDomainName;
	
	
	public void init() {
	}



	/**
	 * 預訂
	 */
	public OrderResult buy(List<OrderParam> params) throws ServiceException {
		//....
		return orderResult;
	}

	/**
	 * 訂單取消
	 */
	public BaseResult cancel(TicketRecord ticketRecord) throws ServiceException {
		//....
		return baseResult;
	}

	/**
	 * 訂單狀態查詢
	 */
	public QueryOrderResult queryOrder(TicketRecord ticketRecord) throws ServiceException {	
	    //....	
		return queryOrderResult;
	}

	
	public String getProvider() {
		return "ACompany";
	}
	public void destroy() {
	}
	
	
	
	public String getAgentId() {
		return agentId;
	}
	public void setAgentId(String agentId) {
		this.agentId = agentId;
	}
	public String getSecretAuthenticationKey() {
		return secretAuthenticationKey;
	}
	public void setSecretAuthenticationKey(String secretAuthenticationKey) {
		this.secretAuthenticationKey = secretAuthenticationKey;
	}
	public String getProviderDomainName() {
		return providerDomainName;
	}
	public void setProviderDomainName(String providerDomainName) {
		this.providerDomainName = providerDomainName;
	}
	
}


==========================================


package com.neil.ticket;

import java.util.HashMap;
import java.util.List;
import java.util.Map;


public abstract class AbstractTicketInvoker implements TicketInvoker {
    private Map<String, AdditionalMethod> methods = new HashMap<String, AdditionalMethod>();

    public abstract OrderResult buy(List<OrderParam> params) throws ServiceException;

    public abstract BaseResult cancel(TicketRecord ticketRecord) throws ServiceException;

    public abstract String getProvider();

    public abstract QueryOrderResult queryOrder(TicketRecord ticketRecord) throws ServiceException;

    public Object query(String methodName, Object[] args) throws ServiceException {
	AdditionalMethod method = methods.get(methodName);
	if (method == null) {
	    throw new ServiceException("沒有這個方法: " + methodName);
	}
	return method.execute(args);
    }

    public void registerMethod(String name, AdditionalMethod method) {
	methods.put(name, method);
    }

}


==========================================



package com.neil.util;

public interface Initializable {

    void init();

    void destroy();

}


==========================================


package com.neil.ticket;

import java.util.List;


public interface TicketInvoker {
    String getProvider();
    
    OrderResult buy(List<OrderParam> params) throws ServiceException;
    
    BaseResult cancel(TicketRecord ticketRecord) throws ServiceException;
    
    QueryOrderResult queryOrder(TicketRecord ticketRecord) throws ServiceException;
    
    Object query(String method, Object[] args) throws ServiceException;
    
    BaseResult resendVoucher(TicketRecord ticketRecord) throws ServiceException;	
}