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Java > Open Source Codes > org > objectstyle > cayenne > access > PersistenceContext


1 /* ====================================================================
2  *
3  * The ObjectStyle Group Software License, version 1.1
4  * ObjectStyle Group - http://objectstyle.org/
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6  * Copyright (c) 2002-2005, Andrei (Andrus) Adamchik and individual authors
7  * of the software. All rights reserved.
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10  * modification, are permitted provided that the following conditions
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22  * must include the following acknowlegement:
23  * "This product includes software developed by independent contributors
24  * and hosted on ObjectStyle Group web site (http://objectstyle.org/)."
25  * Alternately, this acknowlegement may appear in the software itself,
26  * if and wherever such third-party acknowlegements normally appear.
27  *
28  * 4. The names "ObjectStyle Group" and "Cayenne" must not be used to endorse
29  * or promote products derived from this software without prior written
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31  * "andrus at objectstyle dot org".
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52  * individuals and hosted on ObjectStyle Group web site. For more
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54  * <http://objectstyle.org/>.
55  */
56 package org.objectstyle.cayenne.access;
57
58 import java.io.Serializable JavaDoc;
59
60 import org.objectstyle.cayenne.ObjectContext;
61 import org.objectstyle.cayenne.graph.GraphChangeHandler;
62 import org.objectstyle.cayenne.query.QueryExecutionPlan;
63
64 /**
65  * An interface exposed by Cayenne access stack objects to define their interaction with
66  * child ObjectContexts. If a child ObjectContext is a PersistenceContext itself, then it
67  * would allow nesting of multiple levels of contexts.
68  *
69  * @since 1.2
70  * @author Andrus Adamchik
71  */
72 public interface PersistenceContext extends Serializable JavaDoc {
73
74     /**
75      * Merges changes from the ObjectContext parameter. This method is used by child
76      * ObjectContexts to commit their objects to parent. Any changes made to objects as a
77      * result of commit are appended to the changeBuffer.
78      */
79     void commitChangesInContext(ObjectContext context, GraphChangeHandler commitChangeCallback);
80
81     /**
82      * Executes a query using its own preferred transactional behavior.
83      *
84      * @see org.objectstyle.cayenne.query.QueryChain
85      */
86     void performQuery(QueryExecutionPlan query, OperationObserver observer);
87
88     /**
89      * Executes a query within a given transaction. Note that if there is a need to run
90      * multiple queries, a decorator can be created that implements Query, but internally
91      * resolves to more than one actual query.
92      *
93      * @see org.objectstyle.cayenne.query.QueryChain
94      */
95     void performQuery(
96             QueryExecutionPlan query,
97             OperationObserver observer,
98             Transaction transaction);
99 }
100
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