Question

我正在编写Apache CXF Web服务并使用Spring来加载我的bean。我唯一的bean是从Java调用外部进程（MATLAB）。我的bean定义如下：

<bean id="matlabEngine" class="org.burch.pca.matlab.MatlabEngine"
    init-method="start" scope="singleton">
    <constructor-arg value="${matlab.engine.path}"></constructor-arg>
</bean>

<bean
    class="org.springframework.web.context.support.ServletContextPropertyPlaceholderConfigurer">
    <property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE" />
    <property name="searchContextAttributes" value="true" />
    <property name="contextOverride" value="true" />
    <property name="ignoreResourceNotFound" value="true" />
    <property name="locations">
        <list>
            <value>classpath:/pca-engine.properties</value>
        </list>
    </property>
</bean>

我的MatlabEngine bean的一部分如下：

/**
 * Path to MATLAB engine.
 */
private String pathToEngine;

public MatlabEngine(String pathToEngine) throws MatlabConnectionException, MatlabInvocationException{
    super();
    setPathToEngine(pathToEngine);
}

/**
 * Starts engine and goes to path defined by argument
 * @param pathToEngine
 * @throws MatlabConnectionException
 * @throws MatlabInvocationException
 */
public void start() throws MatlabConnectionException, MatlabInvocationException{
  //Create a factory
  RemoteMatlabProxyFactory factory = new RemoteMatlabProxyFactory();

  //Get a proxy, launching MATLAB in the process
  proxy = factory.getProxy();

  //Display welcoming messages in MATLAB Command Window
  proxy.eval(MatlabCommandsRegistry.disp(MATLAB_ENGINE_WELCOME_1));
  proxy.eval(MatlabCommandsRegistry.disp(MATLAB_ENGINE_WELCOME_2));

  if(pathToEngine!= null && !"".equals(pathToEngine)){
      logM("Switching to engine directory...");
      String goToEngineRootDir = MatlabCommandsRegistry.cd(pathToEngine);
      proxy.eval(goToEngineRootDir);
      logM("Sucessfully changed engine dir to "+pathToEngine);
  }
}

当我在Tomcat中部署Web服务时，它很好地启用了MATLAB过程（bean被加载）。

但是，当我使用以下代码向Web服务端点创建客户端请求时：

public static void main(String args[]) throws Exception {

    JaxWsProxyFactoryBean factory = new JaxWsProxyFactoryBean();

    factory.getInInterceptors().add(new LoggingInInterceptor());
    factory.getOutInterceptors().add(new LoggingOutInterceptor());
    factory.setServiceClass(UploadService.class);
    factory.setAddress("http://localhost:8080/auth-ws-1.0.0/services/upload");
    UploadService client = (UploadService) factory.create();

    UploadEntity resume=new UploadEntity();
    resume.setFileName("Image490");
    resume.setFileType("jpg");

    //Work arround data handler....
    DataSource source = new FileDataSource(new File("C:\\Users\\Pictures\\thumb.png"));
    DataHandler dataHandle = new DataHandler(source);
    ByteArrayOutputStream stream = new ByteArrayOutputStream();
    dataHandle.writeTo(stream);
    resume.setPayload(stream.toByteArray());
    client.uploadFile(resume);
    System.exit(0);

}

我的服务器带来了MATLAB进程的新实例（bean再次加载 - 非常繁重且不合需要）。如果只有一个bean用于服务所有处理和所有请求，我该怎么办？我是Spring的新手，我在想我的问题是我在这里处理多个上下文。我希望他们共享单个bean的单个实例，但不知道如何管理它。

感谢您的时间！

Answer 1

您应该为bean启用单例模式。

看看这个：http://static.springsource.org/spring/docs/1.2.x/reference/beans.html#beans-factory-modes

Bean防御可能如下所示：

<!-- Spring property loading bean -->
<bean
    class="org.springframework.web.context.support.ServletContextPropertyPlaceholderConfigurer" singleton="true">
    <property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE" />
    <property name="searchContextAttributes" value="true" />
    <property name="contextOverride" value="true" />
    <property name="ignoreResourceNotFound" value="true" />
    <property name="locations">
        <list>
            <value>classpath:/pca-engine.properties</value>
        </list>
    </property>
</bean>

我认为您应该明智地管理MATLAB流程生命周期以减少资源负载。

Spring bean多次加载

1 个答案: