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9.3.3 The serialize attribute
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The serialize attribute is used to instruct how cached objects are returned. When serialize is set to true, each object requested from the cache is returned as a deep copy. This means that the object you retrieve from the cache will have an identical value but will not be the same instance. This ensures that the actual version that is stored in the cache is never returned. It is important to call attention to the fact that this is not serialization as most would think of it. The objects do not get serialized to disk. This is memory-based serialization that creates deep copies of the cached objects that are in memory.
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9.3.4 Combining readOnly and serialize
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Now that you understand each of these attributes, it may appear that they overlap functionality to some degree. The truth is that they simply work very tightly together. It s important to understand what happens under the hood when you have different combinations of these attributes. We ll look at all four possible combinations and analyze what their benefit is (or lack thereof) in table 9.3.
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Table 9.3 Summary of readOnly and serialize attribute combinations
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readOnly
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True
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False
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Result Good
Reason Fastest retrieval of cached objects. Returns a shared instance of the cached objects, which can be problematic if misused. Fast retrieval of cached objects. Retrieves a deep copy of the cached objects. Cache is only relevant for the life of the calling thread s session and cannot be utilized by other threads. This combination would work the same as readOnly=false and serialize=true, except that it would not make any sense semantically.
False False True
True False True
Good Caution! Bad
The default combination of these two attributes is readOnly=true and serialize=false. This combination instructs the cache to pass back the same reference that is contained within the cache. When using this combination, it is possible to actually alter the cached object. This can be problematic because the object is shared globally. All users who access the cached object through the query mapped statement using the same parameters could possibly retrieve objects that were inappropriately altered by another session. When dealing with cached objects that you do want to alter, you should mark readOnly as false. This will force the cache to return an instance that is specific to the session. When using this in combination with serialize set to true, you are able to get a deep copy of the cached object. This isolates the changes of the retrieved object to the calling session. Another combination that can be used is to set readOnly as false and serialize as false. This can be a useful approach, but it's a rare case where it is appropriate. Setting the two attributes to false requires the cache to produce unique instances of the requested objects for the calling thread. Since serialize is set to false, it does not use the deep copy strategy. Instead, the cache is created to be used only for the life of the session. This means that if you called the same query mapped
Using tags inside the cache model
statement several times in the same session, then you would get the benefit of the caching. However, each time a session calls a cached query mapped statement for the first time, the database will be hit. The final combination of these attributes is readOnly=true and serialize=true. This combination is functionally identical to setting readOnly as false and serialize as true. The problem here is the semantic that it expresses. It does not make any sense to create a readOnly result that you would want to serialize. The intention of serialize is that you expect or plan for the objects contained in the cache to be serialized. So, to serialize a read-only cache is quite absurd. Now that you have a philosophical understanding of the cache, let s dig into setting it up and using it.
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