dubbo中CommandExecutor的作用是什么

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序

本文主要研究一下dubbo的CommandExecutor

CommandExecutor

dubbo-2.7.2/dubbo-plugin/dubbo-qos/src/main/java/org/apache/dubbo/qos/command/CommandExecutor.java

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

CommandContext

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

DefaultCommandExecutor

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

小结

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

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