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locking help

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the following method is in data.java which implements DBAccess interface

Then I have a lockManager class which returns a cookie to be used in the above method

I have another class DataFileAccess which gives the detail methods of Data.java

If this is correct to call lock,update and then unloack from updateRecord method from Data.java

Please comment and any help is appreciated

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No. The user of data.java should do it. But you should document it well.
Note that update(in data class) throws security exception if not provided with a valid coockie, so it has no sense that you lock and unlock in your data class.
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