---
title:  Life Cycle of a Durable Client
---

<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements.  See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License.  You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->

This section discusses the high-level operation of a durable client through initial startup, disconnection, and reconnection.

-   **[Initial Operation](initial-operation.html)**

    The initial startup of a durable client is similar to the startup of any other client, except that it specifically calls the `Cache.readyForEvents` method when all regions and listeners on the client are ready to process messages from the server.

-   **[Disconnection](disconnection.html)**

    While the client and servers are disconnected, their operation varies depending on the circumstances.

-   **[Reconnection](reconnection.html)**

    During initialization, operations on the client cache can come from multiple sources.

-   **[Durable Message Replay](durable-message-replay.html)**

    When the primary server receives the cache ready message, the servers and client execute a procedure to update the queue and replay the events from the stored messages.

-   **[Application Operations During Interest Registration](app-ops-during-int-reg.html)**

    As soon as the client creates its regions, the application hosting the client can start cache operations, even while the client is still receiving its interest registration responses.