Flink流计算窗口中获得窗口的开始、结束、最大时间戳

  基于Flink进行流计算时，如要需要得到每个窗口的开始、结束、最大时间戳，可以通过TimeWindow对象的如下方法获得：

/**
 * Gets the starting timestamp of the window. This is the first timestamp that belongs to this
 * window.
 *
 * @return The starting timestamp of this window.
 */
public long getStart() {
    return start;
}

 

/**
 * Gets the end timestamp of this window. The end timestamp is exclusive, meaning it is the
 * first timestamp that does not belong to this window any more.
 *
 * @return The exclusive end timestamp of this window.
 */
public long getEnd() {
    return end;
}

 

/**
 * Gets the largest timestamp that still belongs to this window.
 *
 * <p>This timestamp is identical to {@code getEnd() - 1}.
 *
 * @return The largest timestamp that still belongs to this window.
 * @see #getEnd()
 */
@Override
public long maxTimestamp() {
    return end - 1;
}