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来自接口的Java回调

callback java

StealthRT · 技术社区 · 5 年前

嘿,我读过一些stackoverflow的文章,是关于从回调接口获取值的。从这些例子中并没有得到很好的理解。

主要代码:

public static void main(String[] args) throws IOException, InterruptedException, ExecutionException {
CmdExecResult cmd = null;       
    List<String> cmdCommand = Arrays.asList(
        "lscm login -r https://XXXXXX:0000/ccm -n XXXX.XXXX -u [name here] -P V_g8#D5gee@",
    );

    List<String> cmdDir = Arrays.asList(
        scmDir,
        ...
    );

    int x = 0;

    for (String state : cmdCommand) {
        //Wait until function is complete before moving to another one
        CompletableFuture<String> cf = CompletableFuture.completedFuture(execCmdSync(cmdDir.get(x) + state, ));
        System.out.println(cf.get());
        x++;

        if (!cf.isDone()) {
            break;
        }
    }

界面:

public interface CmdExecResult{
    void onComplete(boolean success, int exitVal, String error, String output, String originalCmd);
}

以及从main调用的函数:

public static String execCmdSync(String cmd, CmdExecResult callback) throws java.io.IOException, InterruptedException {
    Runtime rt              = Runtime.getRuntime();
    Process proc            = rt.exec(cmd);     
    BufferedReader stdInput = new BufferedReader(new InputStreamReader(proc.getInputStream()));
    BufferedReader stdError = new BufferedReader(new InputStreamReader(proc.getErrorStream()));
    StringBuffer stdOut     = new StringBuffer();
    StringBuffer errOut     = new StringBuffer();
    String s                = null;

    // Read the output from the command:        
    while ((s = stdInput.readLine()) != null) {
        System.out.println(s);
        stdOut.append(s);
    }

    // Read any errors from the attempted command:      
    while ((s = stdError.readLine()) != null) {
        System.out.println(s);
        errOut.append(s);
    }

    if (callback == null) {
        return stdInput.toString();
    }

    int exitVal = proc.waitFor();
    callback.onComplete(exitVal == 0, exitVal, errOut.toString(), stdOut.toString(), cmd);

    return stdInput.toString();
}

我怎样才能拔出钥匙来自 主要功能 查阅 (可完成的未来)?