[RN] Busy JS thread example

busyjsthread.js

class SearchBar extends React.Component {
  render() {
   ...
    return (
       ...
        <TouchableOpacity onPress={this.actBusy.bind(this)}>
          <View style={styles.button}>
            <Text>Spam mqt_js</Text>
          </View>
        </TouchableOpacity>
        <TouchableOpacity onPress={this.spamBridge.bind(this)}>
          <View style={styles.button}>
            <Text>Spam bridge</Text>
          </View>
        </TouchableOpacity>
      ...
    );
  }
  
  // make mqt_js super busy
  actBusy() {
    setTimeout(() => { this.actBusyFor(8000); }, 500);
  }
  
  actBusyFor(milliseconds) {
    var start = new Date().getTime();
    for (var i = 0; i < 1e7; i++) {
      if ((new Date().getTime() - start) > milliseconds) {
        break;
      }
    }
  }
  
  spamBridge() {
    for (var i = 0; i < 1000; i++) {
      this.initTimer();
    }
  }
  
  // setTimeout sends a message over MessageQueue.js to trigger the Native "Timing.createTimer()"
  initTimer() {
    const that = this;
    setTimeout(function() {
      that.initTimer();
    }, 1);
  }
}