?????? some bugfix and refactor for shenyu

[????(dragon-zhang)]

Hi, xiaoyu, thanks for response. Under my local stress test, `HttpClient` can 
reach about 2500 QPS without thread pool configuration:
```java
    @Bean
    public HttpClient httpClient(final HttpClientProperties 
properties) {
        HttpClientProperties.Pool pool = 
properties.getPool();
        ConnectionProvider connectionProvider = 
buildConnectionProvider(pool);
        HttpClient httpClient = 
HttpClient.create(connectionProvider)
                
.tcpConfiguration(tcpClient -> {
                    if 
(Objects.nonNull(properties.getConnectTimeout())) {
                      
  tcpClient = tcpClient.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 
properties.getConnectTimeout());
                    }
                    
HttpClientProperties.Proxy proxy = properties.getProxy();
                    if 
(StringUtils.isNotEmpty(proxy.getHost())) {
                      
  tcpClient = setTcpClientProxy(tcpClient, proxy);
                    }
                    tcpClient 
= tcpClient.doOnConnected(connection -> {
                      
  connection.addHandlerLast(new 
IdleStateHandler(properties.getReaderIdleTime(), 
properties.getWriterIdleTime(), properties.getAllIdleTime(), 
TimeUnit.MILLISECONDS));
                      
  connection.addHandlerLast(new 
WriteTimeoutHandler(properties.getWriteTimeout(), TimeUnit.MILLISECONDS));
                      
  connection.addHandlerLast(new 
ReadTimeoutHandler(properties.getReadTimeout(), TimeUnit.MILLISECONDS));
                    });
//here not config
                    return 
tcpClient;
                });
        HttpClientProperties.Ssl ssl = properties.getSsl();
        if (StringUtils.isNotEmpty(ssl.getKeyStorePath())
                || 
ArrayUtils.isNotEmpty(ssl.getTrustedX509CertificatesForTrustManager())
                || 
ssl.isUseInsecureTrustManager()) {
            httpClient = 
httpClient.secure(sslContextSpec -> setSsl(sslContextSpec, ssl));
        }
        if (properties.isWiretap()) {
            httpClient = httpClient.wiretap(true);
        }
        return 
httpClient.keepAlive(properties.isKeepAlive());
    }

```
And about 2600 QPS after configuration:
```java
    @Bean
    public HttpClient httpClient(final HttpClientProperties 
properties,
                      
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;final ObjectProvider<LoopResources&gt; 
provider) {
&nbsp; &nbsp; &nbsp; &nbsp; HttpClientProperties.Pool pool = 
properties.getPool();
&nbsp; &nbsp; &nbsp; &nbsp; ConnectionProvider connectionProvider = 
buildConnectionProvider(pool);
&nbsp; &nbsp; &nbsp; &nbsp; HttpClient httpClient = 
HttpClient.create(connectionProvider)
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
.tcpConfiguration(tcpClient -&gt; {
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if 
(Objects.nonNull(properties.getConnectTimeout())) {
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; tcpClient = tcpClient.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 
properties.getConnectTimeout());
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
HttpClientProperties.Proxy proxy = properties.getProxy();
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if 
(StringUtils.isNotEmpty(proxy.getHost())) {
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; tcpClient = setTcpClientProxy(tcpClient, proxy);
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; tcpClient 
= tcpClient.doOnConnected(connection -&gt; {
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; connection.addHandlerLast(new 
IdleStateHandler(properties.getReaderIdleTime(), 
properties.getWriterIdleTime(), properties.getAllIdleTime(), 
TimeUnit.MILLISECONDS));
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; connection.addHandlerLast(new 
WriteTimeoutHandler(properties.getWriteTimeout(), TimeUnit.MILLISECONDS));
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; connection.addHandlerLast(new 
ReadTimeoutHandler(properties.getReadTimeout(), TimeUnit.MILLISECONDS));
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; });
//add the config here
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; final 
LoopResources loopResources = provider.getIfAvailable();
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if 
(Objects.nonNull(loopResources)) {
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; tcpClient = tcpClient.runOn(loopResources);
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return 
tcpClient;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; });
&nbsp; &nbsp; &nbsp; &nbsp; HttpClientProperties.Ssl ssl = properties.getSsl();
&nbsp; &nbsp; &nbsp; &nbsp; if (StringUtils.isNotEmpty(ssl.getKeyStorePath())
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; || 
ArrayUtils.isNotEmpty(ssl.getTrustedX509CertificatesForTrustManager())
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; || 
ssl.isUseInsecureTrustManager()) {
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; httpClient = 
httpClient.secure(sslContextSpec -&gt; setSsl(sslContextSpec, ssl));
&nbsp; &nbsp; &nbsp; &nbsp; }
&nbsp; &nbsp; &nbsp; &nbsp; if (properties.isWiretap()) {
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; httpClient = httpClient.wiretap(true);
&nbsp; &nbsp; &nbsp; &nbsp; }
&nbsp; &nbsp; &nbsp; &nbsp; return 
httpClient.keepAlive(properties.isKeepAlive());
&nbsp; &nbsp; }

```


------------------&nbsp;????????&nbsp;------------------
??????:                                                                         
                                               "dev"                            
                                                        <xia...@apache.org&gt;;
????????:&nbsp;2022??4??25??(??????) ????10:36
??????:&nbsp;"dev"<dev@shenyu.apache.org&gt;;

????:&nbsp;Re: some bugfix and refactor for shenyu



Hi

Looks good for me??

BTW??TcpClient#runOn` have better performance?

????(dragon-zhang) <1936978...@qq.com.invalid&gt; ??2022??4??24?????? 
21:32??????
&gt;
&gt; Dear community:
&gt;
&gt; PR[1] use `TcpClient#runOn` and configure 
`DefaultLoopResources`&amp;nbsp;as a singleton bean, and finally fixes ISSUE[2] 
correctly. I'm sorry for the previous wrong submission;
&gt;
&gt;
&gt; PR[3] refactor part of the logic of `ShenyuThreadPoolExecutor` to make it 
more extensible, and fixed a previous bug(see `workQueue.setExecutor(this);` 
line in `ShenyuThreadPoolExecutor`);
&gt;
&gt;
&gt; Now `MemoryLimitCalculator#maxAvailable` will call JNI every time to get 
the latest JVM memory information, PR [4] adjusts it to get it every 50ms;
&gt;
&gt;
&gt; If you are free, please see the PR[1], PR[3], PR[4] and help these PRs to 
be better.
&gt;
&gt; Looking forward to your reply.
&gt;
&gt; [1]&amp;nbsp;https://github.com/apache/incubator-shenyu/pull/3314
&gt; [2]&amp;nbsp;https://github.com/apache/incubator-shenyu/issues/3063
&gt; [3]&amp;nbsp;https://github.com/apache/incubator-shenyu/pull/3315
&gt; [4]&amp;nbsp;https://github.com/apache/incubator-shenyu/pull/3316