/*
* Copyright 2005 Werner Guttmann
*
* Licensed 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.castor.cache.distributed;
import java.util.Map;
import java.util.Properties;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.castor.cache.CacheAcquireException;
/**
* Gigaspaces implementation of Castor JDO Cache.<br><br>
*
* Gigaspaces supports a wide variety of cache topologies, allowing the user
* to distribute and/or replicate application data as needed. This cache instance
* replicates this flexibility by allowing you to configure it (and thus the
* underlying Gigaspaces instance) as follows.<br>
*
* <pre>
* <cache-type type="gigaspaces">
* <cacheUrl>/./</cacheURL>
* <cacheProperties>schema=cache</cacheProperties>
* </cache-type>
* </pre>
*
* As mentioned briefly above, the main issue is the cache topology usage. Per
* definition, Gigaspaces caches can be started in various modes:<br><br>
*
* <ul>
* <li><b>Embedded</b> - cache running as part of the application VM
* (<tt>/./myCache?schema=cache</tt>)</li>
* <li><b>Remote</b> - means you need to run cache server and have relevant
* url at the client to connect to it (<tt>jini//*/*/myCache</tt>)</li>
* <li><b>Master local</b> - means you need to run a cache server and have relevant
* url at the client to connect to it. The URL should include
* '<tt>useLocalCache</tt>' as part of it
* (<tt>jini//*/*/myCache?useLocalCache</tt>)</li>
* </ul><br>
*
* Each of the above can run in <i>replicated</i> or <i>partitioned</i> mode. This
* means you should run several instance in one of the above mode using the relevant
* schema name, total_membres and id.<br><br>
*
* <p><i>instance 1</i>:<br>
* "<tt>/./myCache?schema=cache&cluster_schema=replicated&total_members=2&id=1</tt>"</p>
* <p><i>instance 2</i>:<br>
* "<tt>/./myCache?schema=cache&cluster_schema=replicated&total_members=2&id=2</tt>"</p>
* <br>
*
* or<br><br>
*
* <p><i>instance 1</i>:<br>
* "<tt>/./myCache?schema=cache&cluster_schema=partitioned&total_members=2&id=1</tt>"</p>
* <p><i>instance 2</i>:<br>
* "<tt>/./myCache?schema=cache&cluster_schema=partitioned&total_members=2&id=2</tt>"</p>
* <br>
*
* <p>When running the cache in server or in embedded mode, you <b>must</b> have the
* cache schema to be used, i.e. '<tt>schema=cache</tt>'.</p><br>
*
* For more information on cache topoligies and the use of URLs with Gigaspaces,
* please see
* <a href="http://www.gigaspaces.com/docs/manual/The_Space_URL.htm">here</a>.<br>
*
* For more details on Gigaspaces in general, please see http://www.gigaspaces.com/.<br>
*
* @see <a href="http://www.gigaspaces.com/">The Gigaspaces Home Page</a>
* @see <a href="http://www.gigaspaces.com/wiki">The Gigaspaces Wiki</a>
* @author <a href="mailto:werner DOT guttmann AT gmx DOT net">Werner Guttmann</a>
* @version $Revision: 5951 $ $Date: 2006-04-25 16:09:10 -0600 (Tue, 25 Apr 2006) $
* @since 1.0
*/
public final class GigaspacesCache extends AbstractDistributedCache {
//--------------------------------------------------------------------------
/** The <a href="http://jakarta.apache.org/commons/logging/">Jakarta Commons
* Logging </a> instance used for all logging. */
private static final Log LOG = LogFactory.getLog(GigaspacesCache.class);
/** The type of the cache. */
public static final String TYPE = "gigaspaces";
/** The classname of the implementations factory class. */
public static final String IMPLEMENTATION = "com.j_spaces.map.CacheFinder";
/** Parameter types for calling getCache() method on IMPLEMENTATION. */
private static final Class < ? > [] TYPES_FIND_CACHE = new Class[] {String.class};
/** Default cache URL. */
private static final String DEFAULT_CACHE_URL = "/./";
/** Default cache properties. */
private static final String DEFAULT_CACHE_PROPERTIES = "";
//--------------------------------------------------------------------------
// operations for life-cycle management of cache
/**
* {@inheritDoc}
*/
public void initialize(final Properties params) throws CacheAcquireException {
initialize(IMPLEMENTATION, params);
}
/**
* Normally called to initialize CoherenceCache. To be able to test the method
* without having <code>com.tangosol.net.CacheFactory</code> implementation,
* it can also be called with a test implementations classname.
*
* @param implementation Cache implementation classname to initialize.
* @param params Parameters to initialize the cache (e.g. name, capacity).
* @throws CacheAcquireException If cache can not be initialized.
*/
@SuppressWarnings("unchecked")
public void initialize(final String implementation, final Properties params)
throws CacheAcquireException {
super.initialize(params);
String cacheURL = params.getProperty("cacheURL", DEFAULT_CACHE_URL);
String cacheProperties = params.getProperty(
"cacheProperties", DEFAULT_CACHE_PROPERTIES);
StringBuffer clusterURL = new StringBuffer();
clusterURL.append(cacheURL);
clusterURL.append(getName());
clusterURL.append("?");
clusterURL.append(cacheProperties);
if (LOG.isDebugEnabled()) {
LOG.debug(clusterURL.toString());
}
try {
ClassLoader ldr = this.getClass().getClassLoader();
Class < ? > cls = ldr.loadClass(implementation);
setCache((Map) invokeStaticMethod(
cls, "find", TYPES_FIND_CACHE, new Object[] {clusterURL.toString()}));
} catch (Exception e) {
LOG.error("Problem!", e);
String msg = "Error creating Gigaspaces cache: " + e.getMessage();
LOG.error(msg, e);
throw new CacheAcquireException(msg, e);
}
}
//--------------------------------------------------------------------------
// getters/setters for cache configuration
/**
* {@inheritDoc}
*/
public String getType() { return TYPE; }
//--------------------------------------------------------------------------
}