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Java > Open Source Codes > org > apache > derby > iapi > store > access > xa > XAResourceManager


1 /*
2
3    Derby - Class org.apache.derby.iapi.store.access.xa.XAResourceManager
4
5    Licensed to the Apache Software Foundation (ASF) under one or more
6    contributor license agreements. See the NOTICE file distributed with
7    this work for additional information regarding copyright ownership.
8    The ASF licenses this file to you under the Apache License, Version 2.0
9    (the "License"); you may not use this file except in compliance with
10    the License. You may obtain a copy of the License at
11
12       http://www.apache.org/licenses/LICENSE-2.0
13
14    Unless required by applicable law or agreed to in writing, software
15    distributed under the License is distributed on an "AS IS" BASIS,
16    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17    See the License for the specific language governing permissions and
18    limitations under the License.
19
20  */
21
22 package org.apache.derby.iapi.store.access.xa;
23
24 import org.apache.derby.iapi.services.context.ContextManager;
25
26 import org.apache.derby.iapi.error.StandardException;
27
28 import javax.transaction.xa.Xid JavaDoc;
29
30 /**
31
32 This interface allows access to commit,prepare,abort global transactions
33 as part of a two phase commit protocol. These interfaces have been chosen
34 to be exact implementations required to implement the XAResource interfaces
35 as part of the JTA standard extension.
36 <P>
37 It is expected that the following interfaces are only used during the
38 recovery portion of 2 phase commit, when the transaction manager is
39 cleaning up after a runtime crash - it is expected that no current context
40 managers exist for the Xid's being operated on. The "online" two phase commit
41 protocol will be implemented by calls directly on a TransactionController.
42 <P>
43 The XAResource interface is a Java mapping of the industry standard XA resource
44 manager interface. Please refer to: X/Open CAE Specification - Distributed
45 Transaction Processing: The XA Specification, X/Open Document No. XO/CAE/91/300
46 or ISBN 1 872630 24 3.
47 <P>
48
49 **/
50
51 public interface XAResourceManager
52 {
53     /**************************************************************************
54      * Public Methods of This class:
55      **************************************************************************
56      */
57
58     /**
59      * This method is called to commit the global transaction specified by xid.
60      * <p>
61      * RESOLVE - how do we map to the "right" XAExceptions.
62      * <p>
63      *
64      * @param cm The ContextManager returned from the find() call.
65      * @param xid A global transaction identifier.
66      * @param onePhase If true, the resource manager should use a one-phase
67      * commit protocol to commit the work done on behalf of
68      * xid.
69      *
70      * @exception StandardException Standard exception policy.
71      **/
72     public void commit(
73     ContextManager cm,
74     Xid JavaDoc xid,
75     boolean onePhase)
76         throws StandardException;
77
78     /**
79      * Find the given Xid in the transaction table.
80      * <p>
81      * This routine is used to find a in-doubt transaction from the list
82      * of Xid's returned from the recover() routine.
83      * <p>
84      * In the current implementation it is up to the calling routine
85      * to make the returned ContextManager the "current" ContextManager
86      * before calls to commit,abort, or forget. The caller is responsible
87      * for error handling, ie. calling cleanupOnError() on the correct
88      * ContextManager.
89      * <p>
90      * If the Xid is not in the system, "null" is returned.
91      * RESOLVE - find out from sku if she wants a exception instead?
92      * <p>
93      *
94      * @param xid A global transaction identifier.
95      **/
96     public ContextManager find(
97     Xid JavaDoc xid);
98
99     /**
100      * This method is called to remove the given transaction
101      * from the transaction table/log.
102      * <p>
103      * Used to let the store remove all record from log and transaction
104      * table of the given transaction. This should only be used to
105      * clean up heuristically completed transactions, otherwise commit or
106      * abort should be used to act on other transactions.
107      * <p>
108      * If forget() is called on a transaction which has not be heuristically
109      * completed then it will throw an exception:
110      * SQLState.STORE_XA_PROTOCOL_VIOLATION.
111      *
112      * @param cm The ContextManager returned from the find() call.
113      * @param xid A global transaction identifier.
114      *
115      * @exception StandardException Standard exception policy.
116      *
117      **/
118     public void forget(
119     ContextManager cm,
120     Xid JavaDoc xid)
121         throws StandardException;
122
123     /**
124      * This method is called to obtain a list of prepared transactions.
125      * <p>
126      * This call returns a complete list of global transactions which are
127      * either prepared or heuristically complete.
128      * <p>
129      * The XAResource interface expects a scan type interface, but our
130      * implementation only returns a complete list of transactions. So to
131      * simulate the scan the following state is maintained. If TMSTARTSCAN
132      * is specified the complete list is returned. If recover is called with
133      * TMNOFLAGS is ever called a 0 length array is returned.
134      *
135      * @return Return a array with 0 or more Xid's which are currently in
136      * prepared or heuristically completed state. If an error occurs
137      * during the operation, an appropriate error is thrown.
138      *
139      * @param flags combination of the following flags
140      * XAResource.{TMSTARTRSCAN,TMENDRSCAN,TMNOFLAGS}.
141      * TMNOFLAGS must be used when no other flags are used.
142      *
143      * @exception StandardException Standard exception policy.
144      **/
145     public Xid JavaDoc[] recover(int flags)
146         throws StandardException;
147
148     /**
149      * rollback the transaction identified by Xid.
150      * <p>
151      * The given transaction is roll'ed back and it's history is not
152      * maintained in the transaction table or long term log.
153      * <p>
154      *
155      * @param cm The ContextManager returned from the find() call.
156      * @param xid A global transaction identifier.
157      *
158      * @exception StandardException Standard exception policy.
159      **/
160     public void rollback(
161     ContextManager cm,
162     Xid JavaDoc xid)
163         throws StandardException;
164 }
165
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