python/src/main/java/org/apache/zeppelin/python/PythonInterpreter.java [596:612]:
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    public void waitForReady(int timeout) {
      long startTime = System.currentTimeMillis();
      synchronized (this) {
        while (state == State.LAUNCHED) {
          LOGGER.info("Waiting for python process initialized");
          try {
            wait(100);
          } catch (InterruptedException e) {
            throw new RuntimeException(e);
          }
          if ((System.currentTimeMillis() - startTime) > timeout) {
            onTimeout();
            break;
          }
        }
      }
    }
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rlang/src/main/java/org/apache/zeppelin/r/ZeppelinR.java [340:356]:
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    public void waitForReady(int timeout) {
      long startTime = System.currentTimeMillis();
      synchronized (this) {
        while (state == State.LAUNCHED) {
          LOGGER.info("Waiting for R process initialized");
          try {
            wait(100);
          } catch (InterruptedException e) {
            throw new RuntimeException(e);
          }
          if ((System.currentTimeMillis() - startTime) > timeout) {
            onTimeout();
            break;
          }
        }
      }
    }
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