本篇内容介绍了“dubbo中CommandExecutor的作用是什么”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！
本文主要研究一下dubbo的CommandExecutor
dubbo-2.7.2/dubbo-plugin/dubbo-qos/src/main/java/org/apache/dubbo/qos/command/CommandExecutor.java
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public interface CommandExecutor {
/**
* Execute one command and return the execution result
*
* @param commandContext command context
* @return command execution result
* @throws NoSuchCommandException
*/
String execute(CommandContext commandContext) throws NoSuchCommandException;
}CommandExecutor定义了execute方法，其方法传入CommandContext参数
dubbo-2.7.2/dubbo-plugin/dubbo-qos/src/main/java/org/apache/dubbo/qos/command/CommandContext.java
public class CommandContext {
private String commandName;
private String[] args;
private Channel remote;
private boolean isHttp;
private Object originRequest;
public CommandContext(String commandName) {
this.commandName = commandName;
}
public CommandContext(String commandName, String[] args, boolean isHttp) {
this.commandName = commandName;
this.args = args;
this.isHttp = isHttp;
}
public String getCommandName() {
return commandName;
}
public void setCommandName(String commandName) {
this.commandName = commandName;
}
public String[] getArgs() {
return args;
}
public void setArgs(String[] args) {
this.args = args;
}
public Channel getRemote() {
return remote;
}
public void setRemote(Channel remote) {
this.remote = remote;
}
public boolean isHttp() {
return isHttp;
}
public void setHttp(boolean http) {
isHttp = http;
}
public Object getOriginRequest() {
return originRequest;
}
public void setOriginRequest(Object originRequest) {
this.originRequest = originRequest;
}
}CommandContext定义了commandName、args、remote、isHttp、originRequest参数
dubbo-2.7.2/dubbo-plugin/dubbo-qos/src/main/java/org/apache/dubbo/qos/command/DefaultCommandExecutor.java
public class DefaultCommandExecutor implements CommandExecutor {
@Override
public String execute(CommandContext commandContext) throws NoSuchCommandException {
BaseCommand command = null;
try {
command = ExtensionLoader.getExtensionLoader(BaseCommand.class).getExtension(commandContext.getCommandName());
} catch (Throwable throwable) {
//can't find command
}
if (command == null) {
throw new NoSuchCommandException(commandContext.getCommandName());
}
return command.execute(commandContext, commandContext.getArgs());
}
}DefaultCommandExecutor实现了CommandExecutor接口，其execute方法会根据commandName通过ExtensionLoader来加载对应的comamnd，然后执行command的execute方法
CommandExecutor定义了execute方法，其方法传入CommandContext参数；CommandContext定义了commandName、args、remote、isHttp、originRequest参数；DefaultCommandExecutor实现了CommandExecutor接口，其execute方法会根据commandName通过ExtensionLoader来加载对应的comamnd，然后执行command的execute方法
“dubbo中CommandExecutor的作用是什么”的内容就介绍到这里了，感谢大家的阅读。如果想了解更多行业相关的知识可以关注亿速云网站，小编将为大家输出更多高质量的实用文章！
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