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From Clinton Begin <clinton.be...@gmail.com>
Subject Re: Cache in iBATIS 3.0
Date Mon, 07 Sep 2009 14:22:13 GMT
Ah... interesting.  This is a bug.  The cache in iBATIS is transactional.
 iBATIS also has a "feature" that only commits a transaction if a change was
detected.  These two features are conflicting.  Since selects don't count as
a "change", the transactional cache never flushes.
If you call session.commit(true), you'll probably see calls to putObject.

Can you please file a JIRA ticket for this?

Thanks much!

2009/9/7 Håkan Andersson <hakan.andersson@evertiq.com>

> Hi
>
> Sorry for being unclear, I will try to explain a little better what I
> have done.
>
> I have a fully working web application with the latest ibatis beta
> 3.0.0.200 and what I did was to add <cache type="db.TestCache" /> to a
> mapper, TestCache implements org.apache.ibatis.cache.Cache but at the
> moment it only have logging statements, if I'm not horribly mistaken I
> will see a "in putObject()" if hasKey() is false but I don't.
>
> My test class
> public class TestCache implements Cache {
>
>        static Logger log = Logger.getLogger(TestCache.class);
>
>        private String id;
>        private ReadWriteLock readWriteLock = new ReentrantReadWriteLock();
>
>        /**
>         * @param id
>         */
>        public TestCache(String id) {
>                super();
>                this.id = id;
>        }
>
>        @Override
>        public void clear() {
>                if (log.isDebugEnabled()) {
>                        log.debug("in clear()");
>                }
>
>        }
>
>        @Override
>        public String getId() {
>                if (log.isDebugEnabled()) {
>                        log.debug("in getId()");
>                }
>
>                return this.id;
>        }
>
>        @Override
>        public Object getObject(Object obj) {
>                if (log.isDebugEnabled()) {
>                        log.debug("in getObject()");
>                }
>
>                return "";
>        }
>
>        @Override
>        public ReadWriteLock getReadWriteLock() {
>                if (log.isDebugEnabled()) {
>                        log.debug("in getReadWriteLock()");
>                }
>
>                return this.readWriteLock;
>        }
>
>        @Override
>        public int getSize() {
>                if (log.isDebugEnabled()) {
>                        log.debug("in getSize()");
>                }
>
>                return 0;
>        }
>
>        @Override
>        public boolean hasKey(Object obj) {
>                if (log.isDebugEnabled()) {
>                        log.debug("in hasKey()");
>                }
>                return false;
>        }
>
>        @Override
>        public void putObject(Object arg0, Object arg1) {
>                if (log.isDebugEnabled()) {
>                        log.debug("in putObject()");
>                }
>        }
>
>        @Override
>        public Object removeObject(Object arg0) {
>                if (log.isDebugEnabled()) {
>                        log.debug("in removeObject()");
>                }
>
>                return null;
>        }
> }
>
>
> The logging shows
> DEBUG java.sql.Connection  - ooo Connection Opened
> DEBUG db.TestCache  - in getReadWriteLock()
> DEBUG db.TestCache  - in getReadWriteLock()
> DEBUG db.TestCache  - in hasKey()
> DEBUG db.TestCache  - in getReadWriteLock()
> DEBUG java.sql.PreparedStatement  - ==> Executing: (removed)
> DEBUG java.sql.ResultSet  - <== ResultSet Returned
> DEBUG java.sql.ResultSet  - <== Columns: (removed)
> DEBUG java.sql.ResultSet  - <== Row: (removed)
> DEBUG java.sql.ResultSet  - <== Row: (removed)
> DEBUG db.TestCache  - in getReadWriteLock()
> DEBUG java.sql.Connection  - xxx Connection Closed
>
>
>
> Best Regards
> Håkan Andersson
>
>
> On 06/09/09 09:21, Clinton Begin wrote:
> > I'm not quite sure about your question...
> >
> >   * What are you referring to when you say "the custom cache" -- I'm
> > assuming that's something you've implemented.
> >
> >   * How are you hooking it into your statements?
> >
> >   * Can you provide a simple unit test to demonstrate the behavior (e.g.
> > you could just use a simple hashmap implementation).
> >
> > Cheers,
> > Clinton
> >
> > 2009/9/3 Håkan Andersson <hakan.andersson@evertiq.com
> > <mailto:hakan.andersson@evertiq.com>>
> >
> >     Hi
> >
> >     I have been playing a little with the custom cache in ibatis 3.0 Beta
> 3,
> >     but I can't see that the putObject is fired, is there any special
> >     condition that needs to be fulfilled before it will happen?
> >     hasKey, getObject and getReadWriteLock all get fired when it should
> but
> >     not putObject.
> >
> >
> >     Best Regards
> >     Håkan Andersson
> >
> >
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