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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 19:08:30 GMT
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/openjp
> a/conf/TestDynamicConfiguration.java
> Modified:
>
openjpa/trunk/openjpa-kernel/src/main/java/org/apache/openjpa/conf/OpenJ
PAConfigurationImpl.java
>
openjpa/trunk/openjpa-lib/src/main/java/org/apache/openjpa/lib/conf/Conf
iguration.java
>
openjpa/trunk/openjpa-lib/src/main/java/org/apache/openjpa/lib/conf/Conf
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/Ope
> nJPAConfigurationImpl.java
> URL: 
> http://svn.apache.org/viewvc/openjpa/trunk/openjpa-kernel/src/main/jav
> a/org/apache/openjpa/conf/OpenJPAConfigurationImpl.java?view=diff&rev=
> 566494&r1=566493&r2=566494 
> ======================================================================
> ========
> --- 
> openjpa/trunk/openjpa-kernel/src/main/java/org/apache/openjpa/conf/Ope
> nJPAConfigurationImpl.java (original)
> +++ openjpa/trunk/openjpa-kernel/src/main/java/org/apache/openjpa/conf
> +++ /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&r1=
> 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/con
> +++ 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=566494
> &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/con
> +++ 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/resour
> ces/org/apache/openjpa/lib/conf/localizer.properties?view=diff&rev=566
> 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/openjp
> 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?view
> =auto&rev=566494 
> ======================================================================
> ========
> --- 
> openjpa/trunk/openjpa-persistence-jdbc/src/test/java/org/apache/openjp
> 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

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