Undertow的InMemorySessionManager

https://github.com/undertow-io/undertow/blob/master/core/src/main/java/io/undertow/server/session/InMemorySessionManager.java

private String sessionId;
private volatile Object evictionToken;
private final SessionConfig sessionCookieConfig;
private volatile long expireTime = -1;
private volatile boolean invalid = false;
private volatile boolean invalidationStarted = false;

eviction 驱逐