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