Best practices for "when to close open files.

Hello

I have seen several examples of Javamail on the net that retrieves messages like this:

1 open the folder
2 extracting messages
3. close the file

I know, if I close a parent of a message folder, the object of the message itself could become invalid / not synchronized with the server.
This means that, if I wanted to perform an operation on such a message (like rename, delete etc...) I could 'hit' bad one on the server.

The only solution I could think of would be to keep the file open as long as the user of my program could do something with its content.

In simple terms: If the user clicks on a folder to view its contents, I leave the folder open.
When the user clicks a different folder, I closed that open a new and view its contents.

This means that it can happen that the records could remain open for quite a long time.

It is a good practice or is there a better way?
I have some concerns about loss of connection or waiting times.

Thanks in advance and best regards,
Timo Ernst

It is almost true.

A more complex application can copy the content of the messages so that it can be
used "offline", then re-sync the information cached with the status of the case when
reconnection (for example, after a connection failure).

You probably want to allow connections to expire if the user is not using the application,
but with the simple approach, you will need to update all of your information when that happens,
maybe also tell the user that the session has expired, and they need to log in again.

This works very well for a moderate number of active users. If you need support many
active users, you will need an implementation more complex that expires more connections
aggressively everything by hiding this connection of users management.

Tags: Java

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