用prop來存放對象供多線程共用

• 在用jmeter打壓力時，由于是做rpc調用的請求，用beanshell sampler來發送請求，腳本如下

    import com.netease.love.timeline.ITimelineProtocol;
    import com.netease.tinyrpc.MultiNodeRpcProxyFactory;
    import com.netease.tinyrpc.locator.FixedModHashLocator;
  
    factory = new MultiNodeRpcProxyFactory();
    proxies = factory.createProxy("114.113.201.07:29011,114.113.201.09:29011,114.113.201.10:29011", ITimelineProtocol.class, FixedModHashLocator.class);
    try {
        //proxies.deleteDirectMessage(-1264136337218617121L, 9223219345691512173L, 1551505303962223348L, false);
        proxies.deleteDirectMessage(Long.parseLong(vars.get("userId")), Long.parseLong(vars.get("sessionId")), Long.parseLong(vars.get("messageId")), false);
    //  return vars.get("userId")+ vars.get("sessionId") + vars.get("messageId");
    } catch (Exception e) {
        System.out.println("error");    
        return "false";
    }
    System.out.println("done"); 
  
    return "true";
  

• 用該腳本做調試請求，一切正常，不過有個很明顯的問題：每個請求都會new一個proxy，費時費資源。嘗試著用來跑了2000個請求，便OOM了。

• 解決方案：用單例來存放proxies對象，如下（非嚴格的單例）：

    import com.netease.love.timeline.ITimelineProtocol;
    import com.netease.tinyrpc.MultiNodeRpcProxyFactory;
    import com.netease.tinyrpc.locator.FixedModHashLocator;
  
    ITimelineProtocol proxies = props.get("proxies");
    if(proxies ==  null) {
        factory = new MultiNodeRpcProxyFactory();
        proxies = factory.createProxy("114.113.201.07:29011,114.113.201.09:29011,114.113.201.10:29011", ITimelineProtocol.class, FixedModHashLocator.class);
        props.put("proxies", proxies);
        
    }
    //System.out.println("null=" + (proxies == null));
    //System.out.println("begin");  
    //ITimelineProtocol proxies = factory.createProxy("114.113.201.07:29011,114.113.201.09:29011,114.113.201.10:29011", ITimelineProtocol.class, FixedModHashLocator.class);
    try {
        //-1264136337218617121  9223219345691512173 1551505303962223348
        //proxies.deleteDirectMessage(-1264136337218617121L, 9223219345691512173L, 1551505303962223348L, false);
        proxies.deleteDirectMessage(Long.parseLong(vars.get("userId")), Long.parseLong(vars.get("sessionId")), Long.parseLong(vars.get("messageId")), false);
    //  return vars.get("userId")+ vars.get("sessionId") + vars.get("messageId");
    } catch (Exception e) {
        System.out.println("error");    
        return "false";
    }
    System.out.println("done"); 
  
    return "true";
  

• 再次打壓，不再OOM。