tomcat Standard IO中acceptCount究竟是神马？
tomcat最根本就是一个Socket Server，于是我找到了org.apache.tomcat.util.net.DefaultServerSocketFactory#createSocket(int port, int backlog)，最终就是这个方法执行new java.net.ServerSocket(port, backlog)启动了一个ServerSocket实例。查看ServerSocket API就发现@param backlog the maximum length of the queue.
明确了，tomcat的acceptCount就是ServerSocket的等待队列。
但设置的acceptCount怎么设置到backlog上呢，我翻了好一会儿代码才注意到org.apache.catalina.connector.Connector中有一个变态的HashMap通过这个HashMap把参数名做了一次转换，再赋值给Http11Protocol使用。这样的变态我想应该是想方便tomcat的使用者吧，毕竟整一个backlog参数谁知道是干什么的，另外这个HashMap也把其它参数名做了转换，代码如下
protected static HashMap replacements = new HashMap();
static {
replacements.put("acceptCount", "backlog");
replacements.put("connectionLinger", "soLinger");
replacements.put("connectionTimeout", "soTimeout");
replacements.put("connectionUploadTimeout", "timeout");
replacements.put("clientAuth", "clientauth");
replacements.put("keystoreFile", "keystore");
replacements.put("randomFile", "randomfile");
replacements.put("rootFile", "rootfile");
replacements.put("keystorePass", "keypass");
replacements.put("keystoreType", "keytype");
replacements.put("sslProtocol", "protocol");
replacements.put("sslProtocols", "protocols");
}
// ------------------------------------------------------------- Properties
/**
* Return a configured property.
*/
public Object getProperty(String name) {
String repl = name;
if (replacements.get(name) != null) {
repl = (String) replacements.get(name);
}
return IntrospectionUtils.getProperty(protocolHandler, repl);
}
/**
* Set a configured property.
*/
public boolean setProperty(String name, String value) {
String repl = name;
if (replacements.get(name) != null) {
repl = (String) replacements.get(name);
}
return IntrospectionUtils.setProperty(protocolHandler, repl, value);
}
总结：acceptCount参数其实就是new java.net.ServerSocket(port, backlog)的第二个参数，了解后再设置就不会盲目了。
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