ContainerRequestFilter和ContainerResponseFilter線程安全嗎？

我有下面的代碼，它工作正常。我的問題是天氣下面的代碼是線程安全或不。通過閱讀Servlet Filter和Container * Filter概念，我感到困惑。ContainerRequestFilter和ContainerResponseFilter線程安全嗎？

如何使此過濾器爲線程安全？

@Provider 
public class ResourceLoggingFilter implements ContainerRequestFilter, ContainerResponseFilter { 

@Context 
private ResourceInfo resourceInfo; 

@Context 
private HttpServletRequest servletRequest; 

@Inject 
private java.util.logging.Logger logger; 

public void filter(ContainerRequestContext requestContext, ContainerResponseContext responseContext) throws IOException { 
    String stTime = (String) requestContext.getProperty("StartTime"); 
    logger.log(Level.INFO,"<== Leaving Resource Path: "+ requestContext.getUriInfo().getPath()); 
    logger.log(Level.INFO,"<== Leaving Resource Method: "+ resourceInfo.getResourceMethod().getName()); 
    logger.log(Level.INFO,"<== Leaving Resource class: "+ resourceInfo.getResourceClass().getCanonicalName()); 
    logger.log(Level.INFO,"<== Leaving Session id: "+ servletRequest.getSession().getId()); 
    if (null == stTime || stTime.length() == 0) { 
     logger.log(Level.INFO,"start-time not captured or cleared"); 
     stTime = "0"; 
    } 
    long startTime = Long.parseLong(stTime); 
    long executionTime = System.nanoTime() - startTime; 
    logger.log(Level.INFO,"Total execution time : "+executionTime+" nano seconds." ); 

} 

public void filter(ContainerRequestContext requestContext) throws IOException { 
    requestContext.setProperty("StartTime", String.valueOf(System.nanoTime())); 
    logger.log(Level.INFO,"==> Entering Resource Path: "+ requestContext.getUriInfo().getPath()); 
    logger.log(Level.INFO,"==> Entering Resource Method: "+ resourceInfo.getResourceMethod().getName()); 
    logger.log(Level.INFO,"==> Entering Resource class: "+ resourceInfo.getResourceClass().getCanonicalName()); 
    logger.log(Level.INFO,"==> Entering Session id: "+ servletRequest.getSession().getId()); 

} 

}

編輯是好有private volatile String stTime;聲明，讓stTime可以是線程安全的？

來源

2016-11-09 CHowdappaM

它已經是線程安全的。 ResourceInfo和HttpServletRequest都是代理（使用線程本地），而java.util.Logger上的方法是線程安全的。

見ASLO：

來源

2016-11-10 09:25:48

如果多個響應訪問字符串stTime =（字符串）requestContext.getProperty（「開始時間」）; ?? – CHowdappaM

它是特定的請求。每個請求都得到它自己的線程。 –

感謝您的快速響應，我在想，filter（）在響應中不是線程安全的，而stTime是由另一個響應/線程重寫，而第一個線程計算底部的執行時間。 – CHowdappaM

ContainerRequestFilter和ContainerResponseFilter線程安全嗎？

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