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<p style="margin: 10px 0 0 0">Is the initialization/destruction of the schema necessarily tied to the session factory lifecycle? There might be cases which require to (re)-initialize the schema while an application is running; JPA 2.1 defines <tt>Persistence#generateSchema()</tt> which can be invoked in an ad-hoc fashion. Also I think whether to trigger schema initialization at SF start-up or not, should depend on the <tt>hibernate.hbm2ddl.auto</tt> setting.</p>
<p style="margin: 10px 0 0 0">So would an independent contract for schema initialization be more useful? It would provide hooks for creating/dropping all elements of the schema:</p>
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<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">interface</span> SchemaInitializer {
void createIdentityGenerator(IdGeneratorKeyMetadata generatorKeyMetadata);
void dropIdentityGenerator(IdGeneratorKeyMetadata generatorKeyMetadata);
void createEntityTable(EntityDescriptor entityDescriptor); <span class="code-comment" style="color: #808080">//Not sure what should be passed to identify entity structures?
</span> void dropEntityTable(EntityDescriptor entityDescriptor);
...
}
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<p style="margin: 10px 0 0 0">And be retrieved from the datastore provider and invoked at the right time:</p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">interface</span> DatastoreProvider {
...
<span class="code-object" style="color: #910091">Class</span><? <span class="code-keyword" style="color: #000091">extends</span> SchemaInitializer> getSchemaInitializerType();
}
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<p style="margin: 10px 0 0 0">This will move the decision when to invoke schema initialization/destruction and also the selection of the required contracts into core, leaving only the actual execution to the dialects.</p>
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