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Posted to dev@gora.apache.org by Lewis John Mcgibbney <le...@gmail.com> on 2012/01/04 18:43:06 UTC
Re: svn commit: r1227229 - in /incubator/gora/trunk: ./
gora-cassandra/ gora-core/ gora-core/src/examples/java/org/apache/gora/examples/mapreduce/
gora-core/src/main/java/org/apache/gora/query/impl/ gora-core/src/main/java/org/apache/gora/store/
gora
Hey Ioannis,
This looks excellent and it has been an underlying topic which has
drifted in and out of conversations overs at dev@nutch from time to
time. I am as well coming clean and saying that OSGi is not something
I am familiarised with, but was very interested to hear about @
ApacheCon this year...
I wonder if it is possible for you to sum up what benefits this adds
to Gora, I'm more interested in client interaction e.g. Nutchgora
branch...
Thanks Ioannis, all the best
Lewis
On Wed, Jan 4, 2012 at 5:23 PM, <io...@apache.org> wrote:
> Author: iocanel
> Date: Wed Jan 4 17:23:26 2012
> New Revision: 1227229
>
> URL: http://svn.apache.org/viewvc?rev=1227229&view=rev
> Log:
> [GORA-72] Made all artifacts proper OSGi bundles. Added ClassLoadingUtils which will fallback to thread context classloader if Class.forName fails.
>
> Added:
> incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/util/ClassLoadingUtils.java
> Modified:
> incubator/gora/trunk/gora-cassandra/pom.xml
> incubator/gora/trunk/gora-core/pom.xml
> incubator/gora/trunk/gora-core/src/examples/java/org/apache/gora/examples/mapreduce/QueryCounter.java
> incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/query/impl/QueryBase.java
> incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/store/DataStoreFactory.java
> incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/store/impl/DataStoreBase.java
> incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/util/IOUtils.java
> incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/util/ReflectionUtils.java
> incubator/gora/trunk/gora-sql/pom.xml
> incubator/gora/trunk/gora-sql/src/main/java/org/apache/gora/sql/store/SqlStore.java
> incubator/gora/trunk/gora-sql/src/test/java/org/apache/gora/sql/GoraSqlTestDriver.java
> incubator/gora/trunk/pom.xml
>
> Modified: incubator/gora/trunk/gora-cassandra/pom.xml
> URL: http://svn.apache.org/viewvc/incubator/gora/trunk/gora-cassandra/pom.xml?rev=1227229&r1=1227228&r2=1227229&view=diff
> ==============================================================================
> --- incubator/gora/trunk/gora-cassandra/pom.xml (original)
> +++ incubator/gora/trunk/gora-cassandra/pom.xml Wed Jan 4 17:23:26 2012
> @@ -27,10 +27,15 @@
> <relativePath>../</relativePath>
> </parent>
> <artifactId>gora-cassandra</artifactId>
> - <packaging>jar</packaging>
> + <packaging>bundle</packaging>
>
> <name>Apache Gora :: Cassandra</name>
>
> + <properties>
> + <osgi.import>*</osgi.import>
> + <osgi.export>org.apache.gora.cassandra*;version="${project.version}";-noimport:=true</osgi.export>
> + </properties>
> +
> <build>
> <directory>target</directory>
> <outputDirectory>target/classes</outputDirectory>
>
> Modified: incubator/gora/trunk/gora-core/pom.xml
> URL: http://svn.apache.org/viewvc/incubator/gora/trunk/gora-core/pom.xml?rev=1227229&r1=1227228&r2=1227229&view=diff
> ==============================================================================
> --- incubator/gora/trunk/gora-core/pom.xml (original)
> +++ incubator/gora/trunk/gora-core/pom.xml Wed Jan 4 17:23:26 2012
> @@ -25,10 +25,15 @@
> <relativePath>../</relativePath>
> </parent>
> <artifactId>gora-core</artifactId>
> - <packaging>jar</packaging>
> + <packaging>bundle</packaging>
>
> <name>Apache Gora :: Core</name>
>
> + <properties>
> + <osgi.import>*</osgi.import>
> + <osgi.export>org.apache.gora*;version="${project.version}";-noimport:=true</osgi.export>
> + </properties>
> +
> <build>
> <directory>target</directory>
> <outputDirectory>target/classes</outputDirectory>
>
> Modified: incubator/gora/trunk/gora-core/src/examples/java/org/apache/gora/examples/mapreduce/QueryCounter.java
> URL: http://svn.apache.org/viewvc/incubator/gora/trunk/gora-core/src/examples/java/org/apache/gora/examples/mapreduce/QueryCounter.java?rev=1227229&r1=1227228&r2=1227229&view=diff
> ==============================================================================
> --- incubator/gora/trunk/gora-core/src/examples/java/org/apache/gora/examples/mapreduce/QueryCounter.java (original)
> +++ incubator/gora/trunk/gora-core/src/examples/java/org/apache/gora/examples/mapreduce/QueryCounter.java Wed Jan 4 17:23:26 2012
> @@ -32,6 +32,7 @@ import org.apache.hadoop.mapreduce.Job;
> import org.apache.hadoop.mapreduce.lib.output.NullOutputFormat;
> import org.apache.hadoop.util.Tool;
> import org.apache.hadoop.util.ToolRunner;
> +import org.apache.gora.util.ClassLoadingUtils;
>
> /**
> * Example Hadoop job to count the row of a gora {@link Query}.
> @@ -120,8 +121,8 @@ public class QueryCounter<K, T extends P
> return 1;
> }
>
> - Class<K> keyClass = (Class<K>) Class.forName(args[0]);
> - Class<T> persistentClass = (Class<T>) Class.forName(args[1]);
> + Class<K> keyClass = (Class<K>) ClassLoadingUtils.loadClass(args[0]);
> + Class<T> persistentClass = (Class<T>) ClassLoadingUtils.loadClass(args[1]);
>
> DataStore<K,T> dataStore;
> Configuration conf = new Configuration();
>
> Modified: incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/query/impl/QueryBase.java
> URL: http://svn.apache.org/viewvc/incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/query/impl/QueryBase.java?rev=1227229&r1=1227228&r2=1227229&view=diff
> ==============================================================================
> --- incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/query/impl/QueryBase.java (original)
> +++ incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/query/impl/QueryBase.java Wed Jan 4 17:23:26 2012
> @@ -29,6 +29,7 @@ import org.apache.gora.persistency.Persi
> import org.apache.gora.query.Query;
> import org.apache.gora.query.Result;
> import org.apache.gora.store.DataStore;
> +import org.apache.gora.util.ClassLoadingUtils;
> import org.apache.gora.util.IOUtils;
> import org.apache.hadoop.conf.Configuration;
> import org.apache.hadoop.io.Text;
> @@ -217,8 +218,7 @@ public String[] getFields() {
> public void readFields(DataInput in) throws IOException {
> String dataStoreClass = Text.readString(in);
> try {
> - dataStore = (DataStore<K, T>) ReflectionUtils.newInstance(
> - Class.forName(dataStoreClass), conf);
> + dataStore = (DataStore<K, T>) ReflectionUtils.newInstance(ClassLoadingUtils.loadClass(dataStoreClass), conf);
> dataStore.readFields(in);
> } catch (ClassNotFoundException ex) {
> throw new IOException(ex);
>
> Modified: incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/store/DataStoreFactory.java
> URL: http://svn.apache.org/viewvc/incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/store/DataStoreFactory.java?rev=1227229&r1=1227228&r2=1227229&view=diff
> ==============================================================================
> --- incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/store/DataStoreFactory.java (original)
> +++ incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/store/DataStoreFactory.java Wed Jan 4 17:23:26 2012
> @@ -26,6 +26,7 @@ import org.apache.commons.logging.Log;
> import org.apache.commons.logging.LogFactory;
> import org.apache.gora.persistency.Persistent;
> import org.apache.gora.store.impl.DataStoreBase;
> +import org.apache.gora.util.ClassLoadingUtils;
> import org.apache.gora.util.GoraException;
> import org.apache.gora.util.ReflectionUtils;
> import org.apache.hadoop.conf.Configurable;
> @@ -159,8 +160,8 @@ public class DataStoreFactory {
> throws GoraException {
>
> try {
> - Class k = Class.forName(keyClass);
> - Class p = Class.forName(persistentClass);
> + Class k = ClassLoadingUtils.loadClass(keyClass);
> + Class p = ClassLoadingUtils.loadClass(persistentClass);
> return getDataStore(dataStoreClass, k, p, conf);
> } catch(GoraException ex) {
> throw ex;
>
> Modified: incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/store/impl/DataStoreBase.java
> URL: http://svn.apache.org/viewvc/incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/store/impl/DataStoreBase.java?rev=1227229&r1=1227228&r2=1227229&view=diff
> ==============================================================================
> --- incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/store/impl/DataStoreBase.java (original)
> +++ incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/store/impl/DataStoreBase.java Wed Jan 4 17:23:26 2012
> @@ -35,6 +35,7 @@ import org.apache.gora.persistency.impl.
> import org.apache.gora.store.DataStore;
> import org.apache.gora.store.DataStoreFactory;
> import org.apache.gora.util.AvroUtils;
> +import org.apache.gora.util.ClassLoadingUtils;
> import org.apache.gora.util.StringUtils;
> import org.apache.hadoop.conf.Configuration;
> import org.apache.hadoop.io.Text;
> @@ -173,8 +174,8 @@ public T get(K key) throws IOException {
> @SuppressWarnings("unchecked")
> public void readFields(DataInput in) throws IOException {
> try {
> - Class<K> keyClass = (Class<K>) Class.forName(Text.readString(in));
> - Class<T> persistentClass = (Class<T>)Class.forName(Text.readString(in));
> + Class<K> keyClass = (Class<K>) ClassLoadingUtils.loadClass(Text.readString(in));
> + Class<T> persistentClass = (Class<T>)ClassLoadingUtils.loadClass(Text.readString(in));
> initialize(keyClass, persistentClass, DataStoreFactory.properties);
>
> } catch (ClassNotFoundException ex) {
>
> Added: incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/util/ClassLoadingUtils.java
> URL: http://svn.apache.org/viewvc/incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/util/ClassLoadingUtils.java?rev=1227229&view=auto
> ==============================================================================
> --- incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/util/ClassLoadingUtils.java (added)
> +++ incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/util/ClassLoadingUtils.java Wed Jan 4 17:23:26 2012
> @@ -0,0 +1,64 @@
> +package org.apache.gora.util;
> +
> +public class ClassLoadingUtils {
> +
> + private ClassLoadingUtils() {
> + //Utility Class
> + }
> +
> + /**
> + * Loads a class using the class loader.
> + * 1. The class loader of the current class is being used.
> + * 2. The thread context class loader is being used.
> + * If both approaches fail, returns null.
> + *
> + * @param className The name of the class to load.
> + * @return The class or null if no class loader could load the class.
> + */
> + public static Class<?> loadClass(String className) throws ClassNotFoundException {
> + return ClassLoadingUtils.loadClass(ClassLoadingUtils.class,className);
> + }
> +
> + /**
> + * Loads a class using the class loader.
> + * 1. The class loader of the context class is being used.
> + * 2. The thread context class loader is being used.
> + * If both approaches fail, returns null.
> + *
> + * @param contextClass The name of a context class to use.
> + * @param className The name of the class to load
> + * @return The class or null if no class loader could load the class.
> + */
> + public static Class<?> loadClass(Class<?> contextClass, String className) throws ClassNotFoundException {
> + Class<?> clazz = null;
> + if (contextClass.getClassLoader() != null) {
> + clazz = loadClass(className, contextClass.getClassLoader());
> + }
> + if (clazz == null && Thread.currentThread().getContextClassLoader() != null) {
> + clazz = loadClass(className, Thread.currentThread().getContextClassLoader());
> + }
> + if (clazz == null) {
> + throw new ClassNotFoundException("Failed to load class" + className);
> + }
> + return clazz;
> + }
> +
> + /**
> + * Loads a {@link Class} from the specified {@link ClassLoader} without throwing {@ClassNotFoundException}.
> + *
> + * @param className
> + * @param classLoader
> + * @return
> + */
> + private static Class<?> loadClass(String className, ClassLoader classLoader) {
> + Class<?> clazz = null;
> + if (classLoader != null && className != null) {
> + try {
> + clazz = classLoader.loadClass(className);
> + } catch (ClassNotFoundException e) {
> + //Ignore and return null
> + }
> + }
> + return clazz;
> + }
> +}
>
> Modified: incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/util/IOUtils.java
> URL: http://svn.apache.org/viewvc/incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/util/IOUtils.java?rev=1227229&r1=1227228&r2=1227229&view=diff
> ==============================================================================
> --- incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/util/IOUtils.java (original)
> +++ incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/util/IOUtils.java Wed Jan 4 17:23:26 2012
> @@ -189,7 +189,7 @@ public class IOUtils {
> public static<T> T deserialize(Configuration conf, DataInput in
> , T obj , String objClass) throws IOException, ClassNotFoundException {
>
> - Class<T> c = (Class<T>) Class.forName(objClass);
> + Class<T> c = (Class<T>) ClassLoadingUtils.loadClass(objClass);
>
> return deserialize(conf, in, obj, c);
> }
> @@ -233,7 +233,7 @@ public class IOUtils {
> public static<T> T deserialize(Configuration conf, DataInput in
> , T obj) throws IOException, ClassNotFoundException {
> String clazz = Text.readString(in);
> - Class<T> c = (Class<T>)Class.forName(clazz);
> + Class<T> c = (Class<T>)ClassLoadingUtils.loadClass(clazz);
> return deserialize(conf, in, obj, c);
> }
>
> @@ -477,7 +477,7 @@ public class IOUtils {
> String classKey = dataKey + "._class";
> String className = conf.get(classKey);
> try {
> - T obj = (T) DefaultStringifier.load(conf, dataKey, Class.forName(className));
> + T obj = (T) DefaultStringifier.load(conf, dataKey, ClassLoadingUtils.loadClass(className));
> return obj;
> } catch (Exception ex) {
> throw new IOException(ex);
>
> Modified: incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/util/ReflectionUtils.java
> URL: http://svn.apache.org/viewvc/incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/util/ReflectionUtils.java?rev=1227229&r1=1227228&r2=1227229&view=diff
> ==============================================================================
> --- incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/util/ReflectionUtils.java (original)
> +++ incubator/gora/trunk/gora-core/src/main/java/org/apache/gora/util/ReflectionUtils.java Wed Jan 4 17:23:26 2012
> @@ -87,7 +87,7 @@ public class ReflectionUtils {
> if(classStr == null) {
> throw new IllegalArgumentException("class cannot be null");
> }
> - Class<?> clazz = Class.forName(classStr);
> + Class<?> clazz = ClassLoadingUtils.loadClass(classStr);
> return newInstance(clazz);
> }
>
>
> Modified: incubator/gora/trunk/gora-sql/pom.xml
> URL: http://svn.apache.org/viewvc/incubator/gora/trunk/gora-sql/pom.xml?rev=1227229&r1=1227228&r2=1227229&view=diff
> ==============================================================================
> --- incubator/gora/trunk/gora-sql/pom.xml (original)
> +++ incubator/gora/trunk/gora-sql/pom.xml Wed Jan 4 17:23:26 2012
> @@ -24,10 +24,15 @@
> <version>0.2-SNAPSHOT</version>
> </parent>
> <artifactId>gora-sql</artifactId>
> - <packaging>jar</packaging>
> + <packaging>bundle</packaging>
>
> <name>Apache Gora :: SQL</name>
>
> + <properties>
> + <osgi.import>*</osgi.import>
> + <osgi.export>org.apache.gora.sql*;version="${project.version}";-noimport:=true</osgi.export>
> + </properties>
> +
> <build>
> <directory>target</directory>
> <outputDirectory>target/classes</outputDirectory>
> @@ -116,10 +121,10 @@
> <artifactId>jdom</artifactId>
> </dependency>
>
> - <dependency>
> + <!--dependency>
> <groupId>com.healthmarketscience.sqlbuilder</groupId>
> <artifactId>sqlbuilder</artifactId>
> - </dependency>
> + </dependency-->
>
> <!-- Logging Dependencies -->
> <dependency>
>
> Modified: incubator/gora/trunk/gora-sql/src/main/java/org/apache/gora/sql/store/SqlStore.java
> URL: http://svn.apache.org/viewvc/incubator/gora/trunk/gora-sql/src/main/java/org/apache/gora/sql/store/SqlStore.java?rev=1227229&r1=1227228&r2=1227229&view=diff
> ==============================================================================
> --- incubator/gora/trunk/gora-sql/src/main/java/org/apache/gora/sql/store/SqlStore.java (original)
> +++ incubator/gora/trunk/gora-sql/src/main/java/org/apache/gora/sql/store/SqlStore.java Wed Jan 4 17:23:26 2012
> @@ -65,6 +65,7 @@ import org.apache.gora.sql.util.SqlUtils
> import org.apache.gora.store.DataStoreFactory;
> import org.apache.gora.store.impl.DataStoreBase;
> import org.apache.gora.util.AvroUtils;
> +import org.apache.gora.util.ClassLoadingUtils;
> import org.apache.gora.util.IOUtils;
> import org.apache.gora.util.StringUtils;
> import org.jdom.Document;
> @@ -732,7 +733,7 @@ public class SqlStore<K, T extends Persi
> try {
> Connection connection = null;
>
> - Class.forName(jdbcDriverClass);
> + ClassLoadingUtils.loadClass(jdbcDriverClass);
> if(jdbcUsername == null || jdbcUsername.length() == 0) {
> connection = DriverManager.getConnection(jdbcUrl);
> } else {
>
> Modified: incubator/gora/trunk/gora-sql/src/test/java/org/apache/gora/sql/GoraSqlTestDriver.java
> URL: http://svn.apache.org/viewvc/incubator/gora/trunk/gora-sql/src/test/java/org/apache/gora/sql/GoraSqlTestDriver.java?rev=1227229&r1=1227228&r2=1227229&view=diff
> ==============================================================================
> --- incubator/gora/trunk/gora-sql/src/test/java/org/apache/gora/sql/GoraSqlTestDriver.java (original)
> +++ incubator/gora/trunk/gora-sql/src/test/java/org/apache/gora/sql/GoraSqlTestDriver.java Wed Jan 4 17:23:26 2012
> @@ -24,6 +24,7 @@ import java.util.Properties;
>
> import org.apache.gora.GoraTestDriver;
> import org.apache.gora.sql.store.SqlStore;
> +import org.apache.gora.util.ClassLoadingUtils;
> import org.apache.hadoop.util.StringUtils;
> import org.hsqldb.Server;
>
> @@ -99,7 +100,7 @@ public class GoraSqlTestDriver extends G
> private Connection createConnection(String driverClassName
> , String url) throws Exception {
>
> - Class.forName(driverClassName);
> + ClassLoadingUtils.loadClass(driverClassName);
> Connection connection = DriverManager.getConnection(url);
> connection.setAutoCommit(false);
> return connection;
>
> Modified: incubator/gora/trunk/pom.xml
> URL: http://svn.apache.org/viewvc/incubator/gora/trunk/pom.xml?rev=1227229&r1=1227228&r2=1227229&view=diff
> ==============================================================================
> --- incubator/gora/trunk/pom.xml (original)
> +++ incubator/gora/trunk/pom.xml Wed Jan 4 17:23:26 2012
> @@ -21,7 +21,6 @@
> <groupId>org.apache</groupId>
> <artifactId>apache</artifactId>
> <version>9</version>
> - <relativePath />
> </parent>
>
> <groupId>org.apache.gora</groupId>
> @@ -107,6 +106,40 @@
> <tagBase>https://svn.apache.org/repos/asf/incubator/gora/tags/</tagBase>
> </configuration>
> </plugin>
> + <plugin>
> + <groupId>org.apache.felix</groupId>
> + <artifactId>maven-bundle-plugin</artifactId>
> + <version>${maven-bundle-plugin.version}</version>
> + <extensions>true</extensions>
> + <inherited>true</inherited>
> + <configuration>
> + <instructions>
> + <Bundle-Name>${project.name}</Bundle-Name>
> + <Bundle-SymbolicName>${project.artifactId}</Bundle-SymbolicName>
> + <Export-Package>${osgi.export}</Export-Package>
> + <Import-Package>${osgi.import}</Import-Package>
> + <DynamicImport-Package>${osgi.dynamic.import}</DynamicImport-Package>
> + <Private-Package>${osgi.private}</Private-Package>
> + <Require-Bundle>${osgi.bundles}</Require-Bundle>
> + <Bundle-Activator>${osgi.activator}</Bundle-Activator>
> + </instructions>
> + <supportedProjectTypes>
> + <supportedProjectType>jar</supportedProjectType>
> + <supportedProjectType>war</supportedProjectType>
> + <supportedProjectType>bundle</supportedProjectType>
> + </supportedProjectTypes>
> + <unpackBundle>true</unpackBundle>
> + </configuration>
> + <executions>
> + <execution>
> + <id>bundle-manifest</id>
> + <phase>process-classes</phase>
> + <goals>
> + <goal>manifest</goal>
> + </goals>
> + </execution>
> + </executions>
> + </plugin>
> </plugins>
> </build>
>
> @@ -153,6 +186,7 @@
> <build-helper-maven-plugin.version>1.5</build-helper-maven-plugin.version>
> <maven-surfire-plugin.version>2.11</maven-surfire-plugin.version>
> <maven-release-plugin.version>2.1</maven-release-plugin.version>
> + <maven-bundle-plugin.version>2.3.6</maven-bundle-plugin.version>
> </properties>
>
> <dependencyManagement>
>
>
--
Lewis
Re: svn commit: r1227229 - in /incubator/gora/trunk: ./
gora-cassandra/ gora-core/ gora-core/src/examples/java/org/apache/gora/examples/mapreduce/
gora-core/src/main/java/org/apache/gora/query/impl/ gora-core/src/main/java/org/apache/gora/store/
gora
Posted by Lewis John Mcgibbney <le...@gmail.com>.
Top man Ioannis thanks for the heads up, this is a valuable contribution.
Lewis
On Wed, Jan 4, 2012 at 7:48 PM, Ioannis Canellos <io...@gmail.com> wrote:
>> I wonder if it is possible for you to sum up what benefits this adds
>> to Gora, I'm more interested in client interaction e.g. Nutchgora
>> branch...
>
>
> I am afraid that I don't know that much about nutchgora, so I will give a
> rather general answer.
>
> The value that OSGi brings to the table is its:
>
> Modularity
>
> Add, remove update modules.
> Multiple version of modules possible.
>
> Service Platform that makes sense
>
> Dynamically, add, remove, listen for services.
> Managed services.
>
> How do all these fit into gora or applications using gora?
>
> Inside OSGi one could switch between stores on runtime (e.g. switch from
> using gora-cassandra to gora-hbase on runtime, with no downtime). Or switch
> to different stores of the same type. Or modify on the fly the configuration
> of a store etc.
> He could be able to spawn / destroy stores, without needing to redeploy the
> application.
> Additionally, he could update any of the gora dependencies or even gora
> itself.
>
> I could go on for hours but I think you get the picture. Its all about
> building dynamic applications.
>
> Moreover, it would allow gora to integrate with projects already running
> inside OSGi. Personally I would like to build a camel component for gora,
> but there are more projects from the OSGi world that would like to integrate
> with gora (I think I saw mail about amandatu in the dev list).
>
> --
> Ioannis Canellos
> FuseSource
>
> Blog: http://iocanel.blogspot.com
> Apache Karaf Committer & PMC
> Apache Camel Committer
> Apache ServiceMix Committer
> Apache Gora Committer
> Apache DirectMemory Committer
>
--
Lewis
Re: svn commit: r1227229 - in /incubator/gora/trunk: ./
gora-cassandra/ gora-core/ gora-core/src/examples/java/org/apache/gora/examples/mapreduce/
gora-core/src/main/java/org/apache/gora/query/impl/ gora-core/src/main/java/org/apache/gora/store/
gora
Posted by Ioannis Canellos <io...@gmail.com>.
>
> I wonder if it is possible for you to sum up what benefits this adds
> to Gora, I'm more interested in client interaction e.g. Nutchgora
> branch...
>
I am afraid that I don't know that much about nutchgora, so I will give a
rather general answer.
The value that OSGi brings to the table is its:
- Modularity
- Add, remove update modules.
- Multiple version of modules possible.
- Service Platform that makes sense
- Dynamically, add, remove, listen for services.
- Managed services.
How do all these fit into gora or applications using gora?
Inside OSGi one could switch between stores on runtime (e.g. switch from
using gora-cassandra to gora-hbase on runtime, with no downtime). Or switch
to different stores of the same type. Or modify on the fly the
configuration of a store etc.
He could be able to spawn / destroy stores, without needing to redeploy the
application.
Additionally, he could update any of the gora dependencies or even gora
itself.
I could go on for hours but I think you get the picture. Its all about
building dynamic applications.
Moreover, it would allow gora to integrate with projects already running
inside OSGi. Personally I would like to build a camel component for gora,
but there are more projects from the OSGi world that would like to
integrate with gora (I think I saw mail about amandatu in the dev list).
--
*Ioannis Canellos*
*
FuseSource <http://fusesource.com>
**
Blog: http://iocanel.blogspot.com
**
Apache Karaf <http://karaf.apache.org/> Committer & PMC
Apache Camel <http://camel.apache.org/> Committer
Apache ServiceMix <http://servicemix.apache.org/> Committer
Apache Gora <http://incubator.apache.org/gora/> Committer
Apache DirectMemory <http://incubator.apache.org/directmemory/> Committer
*