/*******************************************************************************
*Copyright (c) 2009 Eucalyptus Systems, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, only version 3 of the License.
*
*
* This file 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 General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Please contact Eucalyptus Systems, Inc., 130 Castilian
* Dr., Goleta, CA 93101 USA or visit <http://www.eucalyptus.com/licenses/>
* if you need additional information or have any questions.
*
* This file may incorporate work covered under the following copyright and
* permission notice:
*
* Software License Agreement (BSD License)
*
* Copyright (c) 2008, Regents of the University of California
* All rights reserved.
*
* Redistribution and use of this software in source and binary forms, with
* or without modification, are permitted provided that the following
* conditions are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. USERS OF
* THIS SOFTWARE ACKNOWLEDGE THE POSSIBLE PRESENCE OF OTHER OPEN SOURCE
* LICENSED MATERIAL, COPYRIGHTED MATERIAL OR PATENTED MATERIAL IN THIS
* SOFTWARE, AND IF ANY SUCH MATERIAL IS DISCOVERED THE PARTY DISCOVERING
* IT MAY INFORM DR. RICH WOLSKI AT THE UNIVERSITY OF CALIFORNIA, SANTA
* BARBARA WHO WILL THEN ASCERTAIN THE MOST APPROPRIATE REMEDY, WHICH IN
* THE REGENTS’ DISCRETION MAY INCLUDE, WITHOUT LIMITATION, REPLACEMENT
* OF THE CODE SO IDENTIFIED, LICENSING OF THE CODE SO IDENTIFIED, OR
* WITHDRAWAL OF THE CODE CAPABILITY TO THE EXTENT NEEDED TO COMPLY WITH
* ANY SUCH LICENSES OR RIGHTS.
*******************************************************************************
* Author: chris grzegorczyk <grze@eucalyptus.com>
*/
package com.eucalyptus.entities;
import java.io.Serializable;
import java.util.concurrent.atomic.AtomicLong;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.PersistenceContext;
import javax.persistence.Table;
import javax.persistence.Transient;
import org.apache.log4j.Logger;
import org.hibernate.annotations.Cache;
import org.hibernate.annotations.CacheConcurrencyStrategy;
import com.eucalyptus.auth.crypto.Crypto;
import com.eucalyptus.auth.crypto.Digest;
import com.eucalyptus.util.EucalyptusCloudException;
import com.eucalyptus.util.Transactions;
import com.eucalyptus.util.Tx;
@Entity
@PersistenceContext( name = "eucalyptus_general" )
@Table( name = "counters" )
@Cache( usage = CacheConcurrencyStrategy.READ_WRITE )
public class Counters extends AbstractPersistent implements Serializable {
private static Logger LOG = Logger.getLogger( Counters.class );
private static Counters singleton;
public static long getIdBlock( int length ) {
if ( singleton != null ) {
return singleton.getBlock( length );
} else {
synchronized ( Counters.class ) {
if ( singleton == null ) {
EntityWrapper<Counters> db = new EntityWrapper<Counters>( "eucalyptus_general" );
try {
singleton = db.getUnique( new Counters() );
} catch ( EucalyptusCloudException e ) {
singleton = new Counters( 0l );
try {
db.add( singleton );
db.commit( );
} catch ( Exception e1 ) {
LOG.fatal( e1, e1 );
LOG.fatal( "Failed to initialize system counters. These are important." );
System.exit( -1 );
}
}
}
}
return singleton.getBlock( length );
}
}
public static String getNextId( ) {
return Crypto.getDigestBase64( Long.toString( Counters.getIdBlock( 1 ) ), Digest.SHA512, false ).replaceAll( "\\.", "" );
}
@Transient
private static Long period = 1000l;
@Transient
private static final AtomicLong tempId = new AtomicLong( -1 );
@Transient
private static final AtomicLong lastSave = new AtomicLong( -1 );
@Column( name = "msg_count" )
private Long messageId;
public Counters( ) {}
public Counters( Long start ) {
this.messageId = start;
}
public static Counters uninitialized( ) {
Counters c = new Counters( );
c.setMessageId( null );
return c;
}
Long getBlock( int length ) {
final Long idStart;
if ( tempId.compareAndSet( -1l, this.messageId ) ) {
lastSave.set( tempId.addAndGet( Counters.period ) );
idStart = tempId.addAndGet( length );
} else {
idStart = tempId.addAndGet( length );
if ( ( idStart - lastSave.get( ) ) > 1000 ) {
try {
Transactions.one( Counters.uninitialized( ), new Tx<Counters>() {
@Override
public void fire( Counters t ) throws Throwable {
t.setMessageId( idStart );
}
} );
} catch ( EucalyptusCloudException e ) {
LOG.debug( e, e );
}
lastSave.set( idStart );
}
}
return idStart;
}
public Long getMessageId( ) {
return messageId;
}
public void setMessageId( Long messageId ) {
this.messageId = messageId;
}
}