logback-android/src/main/java/ch/qos/logback/core/helpers/CyclicBuffer.java
public E get() {
    E r = null;
    if (numElems > 0) {
      numElems--;
      r = ea[first];
      ea[first] = null;
      if (++first == maxSize)
        first = 0;
    }
    return r;
  }
public E get() {
    E r = null;
    if (numElems > 0) {
      numElems--;
      r = ea[first];
      ea[first] = null;
      if (++first == maxSize)
        first = 0;
    }
    return r;
  }
Get the oldest (first) element in the buffer. The oldest element is removed
from the buffer.
@return the element