/*
* Copyright 1999-2008 University of Chicago
*
* 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.globus.workspace.service.impls;
import org.globus.workspace.service.WorkspaceCoschedHome;
import org.globus.workspace.service.CoschedResource;
import org.globus.workspace.service.InstanceResource;
import org.globus.workspace.service.WorkspaceHome;
import org.globus.workspace.persistence.PersistenceAdapter;
import org.globus.workspace.LockManager;
import org.globus.workspace.Lager;
import org.nimbustools.api.services.rm.ManageException;
import org.nimbustools.api.services.rm.DoesNotExistException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.safehaus.uuid.UUIDGenerator;
import net.sf.ehcache.Cache;
import net.sf.ehcache.CacheManager;
import net.sf.ehcache.Element;
import java.util.List;
import java.util.LinkedList;
import edu.emory.mathcs.backport.java.util.concurrent.locks.Lock;
public abstract class CoschedHomeImpl implements WorkspaceCoschedHome {
// -------------------------------------------------------------------------
// STATIC VARIABLES
// -------------------------------------------------------------------------
private static final Log logger =
LogFactory.getLog(CoschedHomeImpl.class.getName());
// -------------------------------------------------------------------------
// INSTANCE VARIABLES
// -------------------------------------------------------------------------
// collaborators
protected final PersistenceAdapter persistence;
protected final WorkspaceHome whome;
protected final Cache cache;
protected final LockManager lockManager;
protected final Lager lager;
// other
protected final UUIDGenerator uuidGen = UUIDGenerator.getInstance();
// -------------------------------------------------------------------------
// CONSTRUCTORS
// -------------------------------------------------------------------------
public CoschedHomeImpl(PersistenceAdapter persistenceAdapter,
LockManager lockManagerImpl,
CacheManager cacheManager,
WorkspaceHome workspaceHome,
Lager lagerImpl) {
if (persistenceAdapter == null) {
throw new IllegalArgumentException("persistenceAdapter may not be null");
}
this.persistence = persistenceAdapter;
if (workspaceHome == null) {
throw new IllegalArgumentException("workspaceHome may not be null");
}
this.whome = workspaceHome;
if (lockManagerImpl == null) {
throw new IllegalArgumentException("lockManagerImpl may not be null");
}
this.lockManager = lockManagerImpl;
if (lagerImpl == null) {
throw new IllegalArgumentException("lagerImpl may not be null");
}
this.lager = lagerImpl;
if (cacheManager == null) {
throw new IllegalArgumentException("cacheManager may not be null");
}
this.cache = cacheManager.getCache("coschedCache");
if (this.cache == null) {
throw new IllegalArgumentException(
"cacheManager does not provide 'coschedCache'");
}
}
// -------------------------------------------------------------------------
// NEW COSCHED RESOURCES
// -------------------------------------------------------------------------
// default configuration has this provided on the fly via IoC
protected abstract CoschedResource newEmptyResource();
public CoschedResource newCosched(String creatorID) throws ManageException {
final CoschedResource resource = this.newEmptyResource();
final String idStr = this.uuidGen.generateRandomBasedUUID().toString();
final Lock lock = this.lockManager.getLock(idStr);
try {
lock.lockInterruptibly();
} catch (InterruptedException e) {
throw new ManageException(e.getMessage(), e);
}
try {
resource.setID(idStr);
resource.setCreatorID(creatorID);
this.persistence.addEnsemble(resource);
final Element el = this.cache.get(idStr);
if (el == null) {
this.cache.put(new Element(idStr, resource));
} else {
throw new ManageException("UUID collision in groups cache, " +
"ID '" + idStr + "' already exists (seriously?)");
}
} finally {
lock.unlock();
}
if (this.lager.eventLog) {
logger.info(Lager.ensembleev(idStr) +
" created on behalf of '" + creatorID + "'");
}
return resource;
}
// -------------------------------------------------------------------------
// FIND
// -------------------------------------------------------------------------
public CoschedResource find(String coschedid)
throws ManageException, DoesNotExistException {
if (coschedid == null) {
throw new ManageException("coschedid may not be null");
}
final CoschedResource resource;
final Lock lock = this.lockManager.getLock(coschedid);
try {
lock.lockInterruptibly();
} catch (InterruptedException e) {
throw new ManageException(e.getMessage(), e);
}
try {
final Element el = this.cache.get(coschedid);
if (el == null) {
resource = this.newEmptyResource();
// throws DoesNotExistException if not in db
this.persistence.loadEnsemble(coschedid, resource);
} else {
resource = (CoschedResource) el.getObjectValue();
}
} finally {
lock.unlock();
}
return resource;
}
public int[] findMemberIDs(String coschedid)
throws ManageException, DoesNotExistException {
if (coschedid == null || coschedid.trim().length() == 0) {
throw new DoesNotExistException("coschedid is missing/empty");
}
return this.persistence.findVMsInEnsemble(coschedid);
}
public InstanceResource[] findMembers(String coschedid)
throws ManageException, DoesNotExistException {
// don't know number of valid members yet because three could be a
// check-then-act problem with findVMsInEnsemble result and some instance
// destruction in the meantime (which is not a problem for this query
// so far, todo: more docs)
final List retlist = new LinkedList();
// will never be null return array, just empty
final int[] ids = this.findMemberIDs(coschedid);
for (int i = 0; i < ids.length; i++) {
final InstanceResource rsrc;
try {
rsrc = this.whome.find(ids[i]);
} catch (DoesNotExistException e) {
continue; // *** SKIP ***
} catch (Throwable t) {
if (logger.isDebugEnabled()) {
logger.error(t.getMessage(), t);
} else {
logger.error(t.getMessage());
}
continue; // *** SKIP ***
}
retlist.add(rsrc);
}
return (InstanceResource[]) retlist.toArray(
new InstanceResource[retlist.size()]);
}
// -------------------------------------------------------------------------
// DESTROY
// -------------------------------------------------------------------------
public void destroy(String coschedid) throws ManageException,
DoesNotExistException {
if (coschedid == null) {
throw new ManageException("id may not be null");
}
final Lock lock = this.lockManager.getLock(coschedid);
try {
lock.lockInterruptibly();
} catch (InterruptedException e) {
throw new ManageException(e.getMessage(), e);
}
try {
final CoschedResource resource = this.find(coschedid);
resource.remove();
this.cache.remove(coschedid);
this.persistence.removeEnsemble(coschedid);
} finally {
lock.unlock();
}
}
}