public boolean isOpen() {
    return !isClosed();
  }
Returns the client's read-timeout setting. This is used in the client health monitor to timeout
connections that have taken too long & the client will have already given up waiting for a
response. Certain messages also may include an override to the normal read-timeout, such as a
query or a putAll.
geode-core/src/main/java/org/apache/geode/internal/cache/tier/sockets/ServerConnection.java