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From "Pinaki Poddar" <ppod...@bea.com>
Subject RE: svn commit: r566494 - in /openjpa/trunk: openjpa-kernel/src/main/java/org/apache/openjpa/conf/ openjpa-lib/src/main/java/org/apache/openjpa/lib/conf/ openjpa-lib/src/main/resources/org/apache/openjpa/lib/conf/ openjpa-persistence-jdbc/src/test/ja
Date Mon, 20 Aug 2007 20:22:12 GMT
 
> Exactly. Therefore, it seems like it'd be better to put the logic for
preventing changing 
> values closer to the values, instead of in the Configuration.

Values do not know which Configuration they belong to. 
How do I know for a particular value instance whether its owner Config
is frozen or not?


> I think that it is more in line with the rest of our configuration /
value architecture for > the Values to declare whether or not they are
configurable.

While it is rather subjective to compare design, OpenJPAConfiguration
seems to work as the medium via which containing Values are modified.
This is in line with my interpretaion of this aspect of design and
rational in my view because it is the state of Configuration that
decides mutability of Values not the Values themselves.

Howver, you understand the motivation/history of this design and if you
think the recent changes jeopardize architectural harmony then I take
your word for it. 

Pinaki Poddar
972.834.2865

-----Original Message-----
From: Patrick Linskey [mailto:plinskey@gmail.com] 
Sent: Monday, August 20, 2007 2:14 PM
To: dev@openjpa.apache.org
Subject: Re: svn commit: r566494 - in /openjpa/trunk:
openjpa-kernel/src/main/java/org/apache/openjpa/conf/
openjpa-lib/src/main/java/org/apache/openjpa/lib/conf/
openjpa-lib/src/main/resources/org/apache/openjpa/lib/conf/
openjpa-persistence-jdbc/src/test/ja

> restriction for few Values to be dynamically modifable. From that 
> standpoint, Configuration declared which Values it thinks can be 
> dynamically configuratble (Values themselves are inert) and allows 
> their modification only via itself.

I think that it would be better from an encapsulation standpoint to put
this logic into Value. Value is not just a simple data structure; it has
complex behavior. This would become just one more piece of that.

> I felt that way Configuration API is
> explictly stating its capability to dynamic modification.

I think that it is more in line with the rest of our configuration /
value architecture for the Values to declare whether or not they are
configurable.

> Configuration
> also now has to skip the dynamic Values from its hashCode. Thus 
> Configuration in one way or the other be aware that certain Values are

> dynamic.

This is actually a bug IMO -- we should not be skipping them, but rather
using the original values. I think that that is a better proxy for
equality comparison.

>  Even now, Value could be changed bypassing Configuration but such 
> pathway will negatively impact two assumptions a) Configuration is 
> frozen b) value-based hashCode is Configuration's identity.

Exactly. Therefore, it seems like it'd be better to put the logic for
preventing changing values closer to the values, instead of in the
Configuration.

-Patrick

On 8/20/07, Pinaki Poddar <ppoddar@bea.com> wrote:
> Hi,
> Configuration imposed the restrictions on its Values to be immutable 
> when configuration is frozen. Now Configuration is relaxing that 
> restriction for few Values to be dynamically modifable. From that 
> standpoint, Configuration declared which Values it thinks can be 
> dynamically configuratble (Values themselves are inert) and allows 
> their modification only via itself. I felt that way Configuration API 
> is explictly stating its capability to dynamic modification. 
> Configuration also now has to skip the dynamic Values from its 
> hashCode. Thus Configuration in one way or the other be aware that 
> certain Values are dynamic.
>
>  Even now, Value could be changed bypassing Configuration but such 
> pathway will negatively impact two assumptions a) Configuration is 
> frozen b) value-based hashCode is Configuration's identity.
>
>
> Pinaki Poddar
> 972.834.2865
>
> -----Original Message-----
> From: Patrick Linskey [mailto:plinskey@gmail.com]
> Sent: Monday, August 20, 2007 1:29 PM
> To: dev@openjpa.apache.org
> Subject: Re: svn commit: r566494 - in /openjpa/trunk:
> openjpa-kernel/src/main/java/org/apache/openjpa/conf/
> openjpa-lib/src/main/java/org/apache/openjpa/lib/conf/
> openjpa-lib/src/main/resources/org/apache/openjpa/lib/conf/
> openjpa-persistence-jdbc/src/test/ja
>
> Hi,
>
> I don't understand why the dynamicness of a setting needs to be 
> exposed to the Configuration.
>
> It seems like it would be more appropriate to move the logic for 
> whether or not something is dynamic to the Value type itself. Value 
> could then have a method called getOriginalString(). For non-dynamic 
> settings, this would be the same as getString().
>
> Additionally, we could make set() or setString() do the logic to 
> validate if the Value's Configuration is read-only and is not dynamic.
> It seems like this would be better from an encapsulation standpoint.
>
> With such an implementation, we would not need to create any new 
> methods in Configuration, and everything would Just Work, once we 
> changed Configuration's equals() method to use getOriginalString().
> Additionally, this would mean that instead of ignoring dynamic 
> settings, we'd be comparing to their original values, which seems like

> a better proxy for equality.
>
> -Patrick
>
> On 8/15/07, ppoddar@apache.org <ppoddar@apache.org> wrote:
> > Author: ppoddar
> > Date: Wed Aug 15 22:52:17 2007
> > New Revision: 566494
> >
> > URL: http://svn.apache.org/viewvc?view=rev&rev=566494
> > Log:
> > Adding support for change of configuration properties after the
> configuration has been frozen.
> > Three methods have been added to Configuration:
> >   i) Configuration.getDynamicValues() returns list of Values that 
> > are
> dynamically modifiable.
> >  ii) Configuration.isDynamic(String property) affirms if the named
> property is dynamically modifiable.
> > iii) Configuration.modifyDynamic(String property, Object value)
> modifies the named property value even when
Configuration.isReadOnly().
> >
> >   Currently, OpenJPAConfigurationImpl.getDynamicValues() return 3 
> > simple IntValue properties {dataCacheTimeout, fetchBatchSize,
> > lockTimeout)
> >
> >
> >
> > Added:
> >
> > openjpa/trunk/openjpa-persistence-jdbc/src/test/java/org/apache/open
> > jp a/conf/TestDynamicConfiguration.java
> > Modified:
> >
> openjpa/trunk/openjpa-kernel/src/main/java/org/apache/openjpa/conf/Ope
> nJ
> PAConfigurationImpl.java
> >
> openjpa/trunk/openjpa-lib/src/main/java/org/apache/openjpa/lib/conf/Co
> nf
> iguration.java
> >
> openjpa/trunk/openjpa-lib/src/main/java/org/apache/openjpa/lib/conf/Co
> nf
> igurationImpl.java
> >
> > openjpa/trunk/openjpa-lib/src/main/resources/org/apache/openjpa/lib/
> > co
> > nf/localizer.properties
> >
> > Modified:
> > openjpa/trunk/openjpa-kernel/src/main/java/org/apache/openjpa/conf/O
> > pe
> > nJPAConfigurationImpl.java
> > URL:
> > http://svn.apache.org/viewvc/openjpa/trunk/openjpa-kernel/src/main/j
> > av 
> > a/org/apache/openjpa/conf/OpenJPAConfigurationImpl.java?view=diff&re
> > v=
> > 566494&r1=566493&r2=566494
> > ====================================================================
> > ==
> > ========
> > ---
> > openjpa/trunk/openjpa-kernel/src/main/java/org/apache/openjpa/conf/O
> > pe nJPAConfigurationImpl.java (original)
> > +++ openjpa/trunk/openjpa-kernel/src/main/java/org/apache/openjpa/co
> > +++ nf /OpenJPAConfigurationImpl.java Wed Aug 15 22:52:17 2007
> > @@ -1437,4 +1437,9 @@
> >      public Log getConfigurationLog() {
> >          return getLog(LOG_RUNTIME);
> >      }
> > +
> > +    public Value[] getDynamicValues() {
> > +       return new Value[]
> {dataCacheTimeout,fetchBatchSize,lockTimeout};
> > +    }
> > +
> >  }
> >
> > Modified:
> > openjpa/trunk/openjpa-lib/src/main/java/org/apache/openjpa/lib/conf/
> > Co
> > nfiguration.java
> > URL:
> > http://svn.apache.org/viewvc/openjpa/trunk/openjpa-lib/src/main/java
> > /o 
> > rg/apache/openjpa/lib/conf/Configuration.java?view=diff&rev=566494&r
> > 1=
> > 566493&r2=566494
> > ====================================================================
> > ==
> > ========
> > ---
> > openjpa/trunk/openjpa-lib/src/main/java/org/apache/openjpa/lib/conf/
> > Co
> > nfiguration.java (original)
> > +++ openjpa/trunk/openjpa-lib/src/main/java/org/apache/openjpa/lib/c
> > +++ on f/Configuration.java Wed Aug 15 22:52:17 2007
> > @@ -223,4 +223,22 @@
> >       * Return a copy of this configuration.
> >       */
> >      public Object clone();
> > +
> > +    /**
> > +     * Modifies a <em>dynamic</em> property of this receiver even
> when
> > +     * {@link #setReadOnly(boolean) frozen}.
> > +     */
> > +    public void modifyDynamic(String property, Object newValue);
> > +
> > +    /**
> > +     * Affirms if the given property can be modified
> <em>dynamically</em> i.e.
> > +     * even after the receiver is {@link #setReadOnly(boolean)
> frozen}.
> > +     */
> > +    public boolean isDynamic(String property);
> > +
> > +    /**
> > +     * Gets the values that can be modified <em>dynamically</em>
i.e.
> > +     * even after the receiver is {@link #setReadOnly(boolean)
> frozen}.
> > +     */
> > +    public Value[] getDynamicValues();
> >  }
> >
> > Modified:
> > openjpa/trunk/openjpa-lib/src/main/java/org/apache/openjpa/lib/conf/
> > Co
> > nfigurationImpl.java
> > URL:
> > http://svn.apache.org/viewvc/openjpa/trunk/openjpa-lib/src/main/java
> > /o
> > rg/apache/openjpa/lib/conf/ConfigurationImpl.java?view=diff&rev=5664
> > 94
> > &r1=566493&r2=566494
> > ====================================================================
> > ==
> > ========
> > ---
> > openjpa/trunk/openjpa-lib/src/main/java/org/apache/openjpa/lib/conf/
> > Co
> > nfigurationImpl.java (original)
> > +++ openjpa/trunk/openjpa-lib/src/main/java/org/apache/openjpa/lib/c
> > +++ on f/ConfigurationImpl.java Wed Aug 15 22:52:17 2007
> > @@ -803,7 +803,7 @@
> >          ConfigurationImpl conf = (ConfigurationImpl) other;
> >          Map p1 = (_props == null) ? toProperties(false) : _props;
> >          Map p2 = (conf._props == null) ? conf.toProperties(false) :
> conf._props;
> > -        return p1.equals(p2);
> > +        return excludeDynamic(p1).equals(excludeDynamic(p2));
> >      }
> >
> >      /**
> > @@ -811,9 +811,8 @@
> >       * {@link #toProperties}.
> >       */
> >      public int hashCode() {
> > -        if (_props != null)
> > -            return _props.hashCode();
> > -        return toProperties(false).hashCode();
> > +       Map copy = (_props == null) ? toProperties(false) : _props;
> > +       return excludeDynamic(copy).hashCode();
> >      }
> >
> >      /**
> > @@ -988,5 +987,36 @@
> >          PluginListValue val = new PluginListValue(property);
> >          addValue(val);
> >          return val;
> > +    }
> > +
> > +    public void modifyDynamic(String property, Object newValue) {
> > +       if (!isDynamic(property))
> > +               throw new RuntimeException(_loc.get("not-dynamic",
> property)
> > +                       .toString());
> > +       Value value = getValue(property);
> > +       value.setObject(newValue);
> > +    }
> > +
> > +    public boolean isDynamic(String property) {
> > +       Value[] dynamicValues = getDynamicValues();
> > +       for (int i=0; i<dynamicValues.length; i++)
> > +               if (dynamicValues[i].getProperty().equals(property))
> > +                       return true;
> > +       return false;
> > +    }
> > +
> > +    public Value[] getDynamicValues() {
> > +       return new Value[0];
> > +    }
> > +
> > +    Map excludeDynamic(Map map) {
> > +       if (map == null)
> > +               return null;
> > +       Map copy = new HashMap(map);
> > +       Value[] dynamicValues = getDynamicValues();
> > +       for (int i=0; i<dynamicValues.length; i++) {
> > +
> Configurations.removeProperty(dynamicValues[i].getProperty(), copy);
> > +       }
> > +       return copy;
> >      }
> >  }
> >
> > Modified:
> > openjpa/trunk/openjpa-lib/src/main/resources/org/apache/openjpa/lib/
> > co
> > nf/localizer.properties
> > URL:
> > http://svn.apache.org/viewvc/openjpa/trunk/openjpa-lib/src/main/reso
> > ur
> > ces/org/apache/openjpa/lib/conf/localizer.properties?view=diff&rev=5
> > 66
> > 494&r1=566493&r2=566494
> > ====================================================================
> > ==
> > ========
> > ---
> > openjpa/trunk/openjpa-lib/src/main/resources/org/apache/openjpa/lib/
> > co
> > nf/localizer.properties (original)
> > +++ openjpa/trunk/openjpa-lib/src/main/resources/org/apache/openjpa/
> > +++ li b/conf/localizer.properties Wed Aug 15 22:52:17 2007
> > @@ -110,3 +110,5 @@
> >  Id-cat: General
> >  Id-displayorder: 50
> >  Id-expert: true
> > +
> > +not-dynamic: Can not modify "{0}" to "{1}" because the property is
> not dynamic.
> >
> > Added:
> > openjpa/trunk/openjpa-persistence-jdbc/src/test/java/org/apache/open
> > jp a/conf/TestDynamicConfiguration.java
> > URL:
> > http://svn.apache.org/viewvc/openjpa/trunk/openjpa-persistence-jdbc/
> > sr 
> > c/test/java/org/apache/openjpa/conf/TestDynamicConfiguration.java?vi
> > ew
> > =auto&rev=566494
> > ====================================================================
> > ==
> > ========
> > ---
> > openjpa/trunk/openjpa-persistence-jdbc/src/test/java/org/apache/open
> > jp a/conf/TestDynamicConfiguration.java (added)
> > +++ openjpa/trunk/openjpa-persistence-jdbc/src/test/java/org/apache/
> > +++ op enjpa/conf/TestDynamicConfiguration.java Wed Aug 15 22:52:17 
> > +++ 2007
> > @@ -0,0 +1,121 @@
> > +/*
> > + * Licensed to the Apache Software Foundation (ASF) under one
> > + * or more contributor license agreements.  See the NOTICE file
> > + * distributed with this work for additional information
> > + * regarding copyright ownership.  The ASF licenses this file
> > + * to you under the Apache License, Version 2.0 (the
> > + * "License"); you may not use this file except in compliance
> > + * with the License.  You may obtain a copy of the License at
> > + *
> > + * http://www.apache.org/licenses/LICENSE-2.0
> > + *
> > + * Unless required by applicable law or agreed to in writing,
> > + * software distributed under the License is distributed on an
> > + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
> > + * KIND, either express or implied.  See the License for the
> > + * specific language governing permissions and limitations
> > + * under the License.
> > + */
> > +package org.apache.openjpa.conf;
> > +
> > +import javax.persistence.Persistence; import 
> > +org.apache.openjpa.persistence.test.*;
> > +import org.apache.openjpa.conf.OpenJPAConfiguration;
> > +import org.apache.openjpa.lib.conf.Value;
> > +import org.apache.openjpa.persistence.OpenJPAEntityManagerFactory;
> > +import org.apache.openjpa.persistence.OpenJPAPersistence;
> > +
> > +/**
> > + * Tests dynamic modification of configuration property.
> > + *
> > + * @author Pinaki Poddar
> > + *
> > + */
> > +public class TestDynamicConfiguration extends SingleEMFTestCase {
> > +
> > +       public void testConfigurationIsEqualByValueAndHashCode() {
> > +               OpenJPAEntityManagerFactory emf1 = createEMF();
> > +               assertNotNull(emf1);
> > +               OpenJPAConfiguration conf1 = 
> > + emf1.getConfiguration();
> > +
> > +               OpenJPAEntityManagerFactory emf2 = createEMF();
> > +               assertNotNull(emf2);
> > +               OpenJPAConfiguration conf2 = 
> > + emf2.getConfiguration();
> > +
> > +               assertFalse(emf1==emf2);
> > +               assertFalse(emf1.equals(emf2));
> > +               assertFalse(conf1==conf2);
> > +               assertEquals(conf1, conf2);
> > +               assertEquals(conf1.hashCode(), conf2.hashCode());
> > +               assertEquals(conf1.toProperties(false),
> conf2.toProperties(false));
> > +       }
> > +
> > +       public void
> testConfigurationIsReadOnlyAfterFirstConstruction() {
> > +               OpenJPAEntityManagerFactory emf = createEMF();
> > +               assertNotNull(emf);
> > +               OpenJPAConfiguration conf = emf.getConfiguration();
> > +               assertFalse(conf.isReadOnly());
> > +               emf.createEntityManager();
> > +               assertTrue(conf.isReadOnly());
> > +       }
> > +
> > +       public void testDynamicValuesCanNotBeChangedDirectly() {
> > +               OpenJPAEntityManagerFactory emf = createEMF();
> > +               assertNotNull(emf);
> > +               emf.createEntityManager();
> > +               OpenJPAConfiguration conf = emf.getConfiguration();
> > +
> > +               Value[] dynamicValues = conf.getDynamicValues();
> > +               assertTrue(dynamicValues.length>0);
> > +               assertTrue(conf.isDynamic("LockTimeout"));
> > +
> > +               int oldValue = conf.getLockTimeout();
> > +               int newValue = oldValue + 10;
> > +               try {
> > +                       conf.setLockTimeout(newValue);
> > +                       fail("Expected exception to modify
> configuration directly");
> > +               } catch (Exception ex) { // good
> > +                       assertEquals(oldValue,
conf.getLockTimeout());
> > +               }
> > +       }
> > +
> > +       public void testDynamicValuesCanBeChanged() {
> > +               OpenJPAEntityManagerFactory emf = createEMF();
> > +               assertNotNull(emf);
> > +               OpenJPAConfiguration conf = emf.getConfiguration();
> > +
> > +               Value[] dynamicValues = conf.getDynamicValues();
> > +               assertTrue(dynamicValues.length>0);
> > +               assertTrue(conf.isDynamic("LockTimeout"));
> > +
> > +               int oldValue = conf.getLockTimeout();
> > +               int newValue = oldValue + 10;
> > +
> > +               conf.modifyDynamic("LockTimeout", newValue);
> > +               assertEquals(newValue, conf.getLockTimeout());
> > +       }
> > +
> > +       public void testDynamicValuesAreCorrectlySet() {
> > +               OpenJPAEntityManagerFactory emf = createEMF();
> > +               assertNotNull(emf);
> > +               OpenJPAConfiguration conf = emf.getConfiguration();
> > +
> > +               Value[] dynamicValues = conf.getDynamicValues();
> > +               assertTrue(dynamicValues.length>0);
> > +               assertTrue(conf.isDynamic("LockTimeout"));
> > +       }
> > +
> > +       public void testDynamicChangeDoesNotChangeHashCode() {
> > +               OpenJPAEntityManagerFactory emf = createEMF();
> > +               assertNotNull(emf);
> > +               OpenJPAConfiguration conf1 = emf.getConfiguration();
> > +
> > +               int oldValue = conf1.getLockTimeout();
> > +               int newValue = oldValue+10;
> > +               int oldHash = conf1.hashCode();
> > +               conf1.modifyDynamic("LockTimeout", newValue);
> > +               int newHash = conf1.hashCode();
> > +
> > +               assertEquals(oldHash, newHash);
> > +       }
> > +}
> >
> >
> >
>
>
> --
> Patrick Linskey
> 202 669 5907
>
> Notice:  This email message, together with any attachments, may
contain information  of  BEA Systems,  Inc.,  its subsidiaries  and
affiliated entities,  that may be confidential,  proprietary,
copyrighted  and/or legally privileged, and is intended solely for the
use of the individual or entity named in this message. If you are not
the intended recipient, and have received this message in error, please
immediately return this by email and then delete it.
>


--
Patrick Linskey
202 669 5907

Notice:  This email message, together with any attachments, may contain information  of  BEA
Systems,  Inc.,  its subsidiaries  and  affiliated entities,  that may be confidential,  proprietary,
 copyrighted  and/or legally privileged, and is intended solely for the use of the individual
or entity named in this message. If you are not the intended recipient, and have received
this message in error, please immediately return this by email and then delete it.

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