# I am the Watcher. I am your guide through this vast new twtiverse.
#
# Usage:
# https://watcher.sour.is/api/plain/users View list of users and latest twt date.
# https://watcher.sour.is/api/plain/twt View all twts.
# https://watcher.sour.is/api/plain/mentions?uri=:uri View all mentions for uri.
# https://watcher.sour.is/api/plain/conv/:hash View all twts for a conversation subject.
#
# Options:
# uri Filter to show a specific users twts.
# offset Start index for quey.
# limit Count of items to return (going back in time).
#
# twt range = 1 1
# self = https://watcher.sour.is/conv/ozxsgda
圖解 JVM 如何解決對象跨代引用的問題**
在新生代做 GCRoots 可達性掃描過程中,可能會碰到跨代引用的對象的問題,如下圖所示: 在新生代掃面的時候會掃描不到 D 對象,如果這個 D 對象不去老年代掃描是否有被引用,那麼就會無法觸達,如下如所示: 但是 D 對象是有被引用的,如果直接回收 D 對象就會造成一些意想不到的問題,如果爲了掃描 D 對象是否存在跨代引用而對老年代整體掃描一遍,就會帶來整個垃圾回收的效率低下 ⌘ Read more