Question

我正在使用Java 6并尝试为telnet连接编写故障转移（即，如果它无法连接/拒绝，超时等，则地址1进行故障转移并再次尝试寻址2）。如果address1有效，那么一切都很好并返回我的结果，但是，如果第一个地址拒绝连接，则address2将始终失败（即使它在第一次测试中设置为工作地址）。 Telnet服务是一个只处理连接选项的便利类，并且从inputStream“获取”数据（如果有人需要更多细节：这是在GWT服务器端服务impl类中）：

我正在使用commons-net-3.3

这里是无法“故障转移”的代码部分：

public List<Problem> searchForProblemRemote(final String searchStr) {

    String msg = "ProblemService:searchForProblemRemote; searchString = " + searchStr;

    if (!GWT.isProdMode()) {
      log.info(" Remote Address : " + getThreadLocalRequest().getRemoteAddr() + " Session Id: "
          + getThreadLocalRequest().getSession().getId() + " User: "
          + getThreadLocalRequest().getSession().getAttribute("user") + " Info: " + msg);
    }


    List<Problem> clientProblemList = null;// new
    try {
      final TelnetService telnet = new TelnetService();

      // HF - this is now using the imo host address from the config file
      final String imoHostAddress = ConfigurationLoader.getConfiguration().getImoHostAddress();
      final String imoAccountNumber = ConfigurationLoader.getConfiguration().getImoAccountNumber();
      final int imoProblemItPort = ConfigurationLoader.getConfiguration().getImoProblemItPort();

      String searchResults = "";
      // here is where we try the timeout
      try {
        telnet.connect(imoHostAddress, imoProblemItPort);
        searchResults = telnet.getResult("search^50^" + searchStr + "^" + imoAccountNumber);
      } catch (Exception e1) {
        // HF - if we fail to connect try the failover
        final String imoHostFailoverAddress = ConfigurationLoader.getConfiguration().getImoHostFailoverAddress();
        final String imoAccountFailoverNumber = ConfigurationLoader.getConfiguration().getImoAccountFailoverNumber();
        log.fatal("IMO FAILOVER: on " + imoHostAddress + " with " + e1.getLocalizedMessage());

        try {
          telnet.disconnect();

          log.fatal("IMO FAILOVER RECOVERY: on " + imoHostFailoverAddress);
          telnet.connect(imoHostFailoverAddress, imoProblemItPort);
          searchResults = telnet.getResult("search^50^" + searchStr + "^" + imoAccountFailoverNumber);
          log.fatal("IMO FAILOVER SUCCESS: on " + imoHostFailoverAddress);
        } catch (Exception e) {
          log.fatal("IMO FAILOVER RECOVERY FAILED: on " + imoHostFailoverAddress + " with " + e.getLocalizedMessage());
          throw new IOException("IMO SERVER FAILURE: Unable to connect to either primary \"" + imoHostAddress
              + "\" or  failover \"" + imoHostFailoverAddress);
        }
      }

      log.info("IMO Search searchResults, User: " + getThreadLocalRequest().getSession().getAttribute("user")
          + " Results:" + searchResults);
      telnet.disconnect();

    //CODE REMOVED HERE FOR CLARITY (lots of processing of results stuff)

java apache commons telnet重试失败

0 个答案: