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Added a primitive but seemingly effective store name cache. Switching the

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stores table to a synthetic primary key caused a 15% performance drop. This gets
that performance back, plus or minus.


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@4493 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
This commit is contained in:
Britt Park
2006-12-02 20:53:33 +00:00
parent b8ff632f15
commit b19c40939f
3 changed files with 41 additions and 1 deletions
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35
source/java/org/alfresco/repo/avm/hibernate/AVMStoreDAOHibernate.java
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@@ -17,7 +17,9 @@
package org.alfresco.repo.avm.hibernate;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.alfresco.repo.avm.AVMNode;
import org.alfresco.repo.avm.AVMStore;
@@ -33,12 +35,18 @@ import org.springframework.orm.hibernate3.support.HibernateDaoSupport;
class AVMStoreDAOHibernate extends HibernateDaoSupport implements
AVMStoreDAO
{
/**
* An in memory cache of name to primary key mappings.
*/
private Map<String, Long> fNameCache;
/**
* Do nothing constructor.
*/
public AVMStoreDAOHibernate()
{
super();
fNameCache = new HashMap<String, Long>();
}
/**
@@ -77,10 +85,27 @@ class AVMStoreDAOHibernate extends HibernateDaoSupport implements
*/
public AVMStore getByName(String name)
{
Long id = null;
synchronized (this)
{
id = fNameCache.get(name);
}
if (id != null)
{
return (AVMStore)getSession().get(AVMStoreImpl.class, id);
}
Query query = getSession().createQuery("from AVMStoreImpl st " +
"where st.name = :name");
query.setParameter("name", name);
return (AVMStore)query.uniqueResult();
AVMStore result = (AVMStore)query.uniqueResult();
synchronized (this)
{
if (result != null)
{
fNameCache.put(name, result.getId());
}
}
return result;
}
/**
@@ -112,4 +137,12 @@ class AVMStoreDAOHibernate extends HibernateDaoSupport implements
{
return (AVMStore)getSession().get(AVMStoreImpl.class, id);
}
/* (non-Javadoc)
* @see org.alfresco.repo.avm.AVMStoreDAO#invalidateCache()
*/
public synchronized void invalidateCache()
{
fNameCache.clear();
}
}