Method push

app/src/main/java/eu/faircode/email/RingBuffer.java:32–39

(T item)

    }

    public synchronized void push(T item) {
        if (count == buffer.length)
            pop();

        buffer[in] = item;
        in = (in + 1) % buffer.length;
        count++;
    }

    public synchronized T pop() {
        T item = buffer[out];