/*
* JBoss, Home of Professional Open Source.
* Copyright 2006, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.aspects.versioned;
import org.jboss.aop.InstanceAdvised;
import org.jboss.aop.proxy.ClassProxy;
import org.jboss.aop.proxy.ClassProxyFactory;
import org.jboss.logging.Logger;
import org.jboss.tm.TransactionLocal;
import org.jboss.util.id.GUID;
import javax.naming.InitialContext;
import javax.transaction.Transaction;
import javax.transaction.TransactionManager;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
/**
*
* @author <a href="mailto:bill@jboss.org">Bill Burke</a>
* @version $Revision: 57186 $
*/
public class DistributedMapState extends CollectionStateManager implements Map, DistributedState, java.io.Externalizable
{
private static final long serialVersionUID = -5397547850033533784L;
private static HashMap mapMethodMap;
protected static Logger log = Logger.getLogger(DistributedMapState.class);
static
{
try
{
mapMethodMap = new HashMap();
Method[] methods = Map.class.getDeclaredMethods();
for (int i = 0; i < methods.length; i++)
{
long hash = org.jboss.aop.util.MethodHashing.methodHash(methods[i]);
mapMethodMap.put(new Long(hash), methods[i]);
}
}
catch (Exception ignored)
{
ignored.printStackTrace();
}
}
protected volatile long versionId;
protected HashMap updates;
protected String classname;
transient protected Map base;
transient protected TransactionLocal txState = new TransactionLocal();
transient protected TransactionLocal txVersion = new TransactionLocal();
transient protected DistributedVersionManager versionManager;
transient protected SynchronizationManager synchManager;
transient protected TransactionManager tm;
transient protected ClassProxy proxy;
/**
* For serialization
*/
public DistributedMapState() {}
public DistributedMapState(GUID guid, long timeout, ClassProxy proxy, Map obj, DistributedVersionManager versionManager, SynchronizationManager synchManager)
throws Exception
{
super(guid, timeout, mapMethodMap);
this.base = obj;
this.classname = obj.getClass().getName();
this.versionManager = versionManager;
this.synchManager = synchManager;
this.proxy = proxy;
InitialContext ctx = new InitialContext();
this.tm = (TransactionManager)ctx.lookup("java:/TransactionManager");
this.updates = createMapUpdates(base);
}
public HashMap getMethodMap()
{
return ClassProxyFactory.getMethodMap(base.getClass().getName());
}
public InstanceAdvised getObject() { return proxy; }
// The Guts
protected Map getCurrentState(boolean forUpdate) throws Exception
{
Transaction tx = tm.getTransaction();
if (tx == null)
{
if (forUpdate) versionId++;
return base;
}
Map state = (Map)txState.get(tx);
if (state == null && forUpdate)
{
state = (Map)base.getClass().newInstance();
state.putAll(base);
txState.set(tx, state);
long newId = versionId + 1;
synchManager.registerUpdate(tx, this);
txVersion.set(tx, new Long(newId));
return state;
}
return base;
}
protected HashMap createMapUpdates(Map state)
{
HashMap mapUpdates = new HashMap();
Iterator it = state.entrySet().iterator();
while (it.hasNext())
{
Map.Entry entry = (Map.Entry)it.next();
Object obj = entry.getValue();
if (versionManager.isVersioned(obj))
{
mapUpdates.put(entry.getKey(), new VersionReference(VersionManager.getGUID((InstanceAdvised)obj)));
}
else
{
mapUpdates.put(entry.getKey(), obj);
}
}
return mapUpdates;
}
public DistributedUpdate createTxUpdate(Transaction tx)
{
Map state = (Map)txState.get(tx);
long newId = ((Long)txVersion.get(tx)).longValue();
DistributedMapUpdate update = new DistributedMapUpdate(guid, createMapUpdates(state), newId);
return update;
}
public InstanceAdvised buildObject(SynchronizationManager manager, DistributedVersionManager versionManager)
throws Exception
{
log.trace("building a Map");
this.versionManager = versionManager;
this.synchManager = manager;
log.trace("DistributedMaptState: classname: " + classname);
Class clazz = Thread.currentThread().getContextClassLoader().loadClass(classname);
base = (Map)clazz.newInstance();
Iterator it = updates.entrySet().iterator();
while (it.hasNext())
{
Map.Entry entry = (Map.Entry)it.next();
Object val = entry.getValue();
if (val instanceof VersionReference)
{
VersionReference ref = (VersionReference)val;
val = manager.getObject(ref.getGUID());
if (val == null)
{
DistributedState fieldVal = manager.getState(ref.getGUID());
val = fieldVal.buildObject(manager, versionManager);
ref.set((InstanceAdvised)val);
}
}
base.put(entry.getKey(), val);
}
proxy = versionManager.addMapVersioning(base, this);
return proxy;
}
public void checkOptimisticLock(Transaction tx)
{
// NOTE THIS CODE ASSUMES THAT A WRITELOCK HAS BEEN ACQUIRED!!!!
Long version = (Long)txVersion.get(tx);
if (version.longValue() <= versionId)
throw new OptimisticLockFailure("optimistic lock failure for list");
}
public void mergeState(Transaction tx) throws Exception
{
// NOTE THIS CODE ASSUMES THAT A WRITELOCK HAS BEEN ACQUIRED!!!!
Map current = (Map)txState.get(tx);
base = current;
Long version = (Long)txVersion.get(tx);
versionId = version.longValue();
}
public void mergeState(DistributedUpdate update) throws Exception
{
DistributedMapUpdate mapUpdate = (DistributedMapUpdate)update;
this.versionId = mapUpdate.versionId;
base.clear();
Iterator it = mapUpdate.mapUpdates.entrySet().iterator();
while (it.hasNext())
{
Map.Entry entry = (Map.Entry)it.next();
Object val = entry.getValue();
if (val instanceof VersionReference)
{
VersionReference ref = (VersionReference)val;
val = synchManager.getObject(ref.getGUID());
ref.set((InstanceAdvised)val);
}
base.put(entry.getKey(), val);
}
updates = mapUpdate.mapUpdates;
}
// java.util.Map wrap
public void clear()
{
try
{
lock.readLock().acquire();
try
{
Map state = getCurrentState(true);
state.clear();
}
finally
{
lock.readLock().release();
}
}
catch (Exception ex)
{
throw new RuntimeException(ex);
}
}
public boolean containsKey(Object o)
{
try
{
lock.readLock().acquire();
try
{
Map state = getCurrentState(false);
return state.containsKey(o);
}
finally
{
lock.readLock().release();
}
}
catch (Exception ex)
{
throw new RuntimeException(ex);
}
}
public boolean containsValue(Object o)
{
try
{
lock.readLock().acquire();
try
{
Map state = getCurrentState(false);
return state.containsKey(o);
}
finally
{
lock.readLock().release();
}
}
catch (Exception ex)
{
throw new RuntimeException(ex);
}
}
public Set entrySet()
{
try
{
lock.readLock().acquire();
try
{
Map state = getCurrentState(false);
return state.entrySet();
}
finally
{
lock.readLock().release();
}
}
catch (Exception ex)
{
throw new RuntimeException(ex);
}
}
public boolean equals(Object o)
{
try
{
lock.readLock().acquire();
try
{
Map state = getCurrentState(false);
return state.equals(o);
}
finally
{
lock.readLock().release();
}
}
catch (Exception ex)
{
throw new RuntimeException(ex);
}
}
public Object get(Object o)
{
try
{
lock.readLock().acquire();
try
{
Map state = getCurrentState(false);
return state.get(o);
}
finally
{
lock.readLock().release();
}
}
catch (Exception ex)
{
throw new RuntimeException(ex);
}
}
public int hashCode()
{
try
{
lock.readLock().acquire();
try
{
Map state = getCurrentState(false);
return state.hashCode();
}
finally
{
lock.readLock().release();
}
}
catch (Exception ex)
{
throw new RuntimeException(ex);
}
}
public boolean isEmpty()
{
try
{
lock.readLock().acquire();
try
{
Map state = getCurrentState(false);
return state.isEmpty();
}
finally
{
lock.readLock().release();
}
}
catch (Exception ex)
{
throw new RuntimeException(ex);
}
}
public Set keySet()
{
try
{
lock.readLock().acquire();
try
{
Map state = getCurrentState(false);
return state.keySet();
}
finally
{
lock.readLock().release();
}
}
catch (Exception ex)
{
throw new RuntimeException(ex);
}
}
public Object put(Object key, Object val)
{
try
{
lock.readLock().acquire();
try
{
val = versionManager.makeVersioned(val);
Map state = getCurrentState(true);
return state.put(key, val);
}
finally
{
lock.readLock().release();
}
}
catch (Exception ex)
{
throw new RuntimeException(ex);
}
}
public void putAll(Map c)
{
try
{
lock.readLock().acquire();
try
{
Map state = getCurrentState(true);
Iterator it = state.entrySet().iterator();
while (it.hasNext())
{
Map.Entry entry = (Map.Entry)it.next();
Object val = versionManager.makeVersioned(entry.getValue());
state.put(entry.getKey(), val);
}
}
finally
{
lock.readLock().release();
}
}
catch (Exception ex)
{
throw new RuntimeException(ex);
}
}
// REVISIT: On the remove stuff, we need to decide what happens
// does the object removed get unversioned? How is this handled
// within a transaction?
//
public Object remove(Object key)
{
try
{
lock.readLock().acquire();
try
{
Map state = getCurrentState(true);
return state.remove(key);
}
finally
{
lock.readLock().release();
}
}
catch (Exception ex)
{
throw new RuntimeException(ex);
}
}
public int size()
{
try
{
lock.readLock().acquire();
try
{
Map state = getCurrentState(false);
return state.size();
}
finally
{
lock.readLock().release();
}
}
catch (Exception ex)
{
throw new RuntimeException(ex);
}
}
public Collection values()
{
try
{
lock.readLock().acquire();
try
{
Map state = getCurrentState(false);
return state.values();
}
finally
{
lock.readLock().release();
}
}
catch (Exception ex)
{
throw new RuntimeException(ex);
}
}
public void writeExternal(java.io.ObjectOutput out)
throws java.io.IOException
{
super.writeExternal(out);
out.writeLong(versionId);
out.writeObject(updates);
out.writeObject(classname);
}
public void readExternal(java.io.ObjectInput in)
throws java.io.IOException, ClassNotFoundException
{
super.readExternal(in);
versionId = in.readLong();
this.updates = (HashMap)in.readObject();
this.classname = (String)in.readObject();
try
{
InitialContext ctx = new InitialContext();
this.tm = (TransactionManager)ctx.lookup("java:/TransactionManager");
}
catch (Exception ex)
{
throw new RuntimeException(ex);
}
this.txState = new TransactionLocal();
this.txVersion = new TransactionLocal();
this.methodMap = mapMethodMap;
}
}
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