PLockImpl.java

/**
* OLAT - Online Learning and Training<br>
* http://www.olat.org
* <p>
* Licensed under the Apache License, Version 2.0 (the "License"); <br>
* you may not use this file except in compliance with the License.<br>
* You may obtain a copy of the License at
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* Unless required by applicable law or agreed to in writing,<br>
* software distributed under the License is distributed on an "AS IS" BASIS, <br>
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. <br>
* See the License for the specific language governing permissions and <br>
* limitations under the License.
* <p>
* Copyright (c) since 2004 at Multimedia- & E-Learning Services (MELS),<br>
* University of Zurich, Switzerland.
* <hr>
* <a href="http://www.openolat.org">
* OpenOLAT - Online Learning and Training</a><br>
* This file has been modified by the OpenOLAT community. Changes are licensed
* under the Apache 2.0 license as the original file.
*/

package org.olat.core.commons.services.lock.pessimistic;

import java.util.Date;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.persistence.Version;

import org.hibernate.annotations.GenericGenerator;
import org.hibernate.annotations.Parameter;
import org.olat.core.id.CreateInfo;
import org.olat.core.id.Persistable;

/**
 * A <b>OLATResourceImpl</b> is 
 * 
 * @author Andreas
 *
 */
@Entity(name="plock")
@Table(name="o_plock")
@NamedQueries({
	@NamedQuery(name="loadByPLockByAsset", query="select lock from plock as lock where lock.asset=:asset")
})
public class PLockImpl implements PLock, CreateInfo, Persistable {

	private static final long serialVersionUID = 1954725655490667921L;
	
	@Id
	@GeneratedValue(generator = "system-uuid")
	@GenericGenerator(name = "system-uuid", strategy = "enhanced-sequence", parameters={
		@Parameter(name="sequence_name", value="hibernate_unique_key"),
		@Parameter(name="force_table_use", value="true"),
		@Parameter(name="optimizer", value="legacy-hilo"),
		@Parameter(name="value_column", value="next_hi"),
		@Parameter(name="increment_size", value="32767"),
		@Parameter(name="initial_value", value="32767")
	})
	@Column(name="plock_id", nullable=false, unique=true, insertable=true, updatable=false)
	private Long key;
	@Version
	private int version = 0;
	@Temporal(TemporalType.TIMESTAMP)
	@Column(name="creationdate", nullable=false, insertable=true, updatable=false)
	private Date creationDate;

	@Column(name="asset", nullable=false, insertable=true, updatable=false, unique=true)
	private String asset;
	
	/**
	* Constructor needed for Hibernate.
	*/
	public PLockImpl() {
		// singleton
	}

	public PLockImpl(String asset) {
		this.asset = asset;
	}
	
	@Override
	public Long getKey() {
		return key;
	}
	
	@Override
	public Date getCreationDate() {
		return creationDate;
	}
	
	public void setCreationDate(Date creationDate) {
		this.creationDate = creationDate;
	}

	public String getAsset() {
		return asset;
	}

	public void setAsset(String asset) {
		this.asset = asset;
	}

	@Override
	public int hashCode() {
		return key == null ? 2396928 : key.hashCode();
	}

	@Override
	public boolean equals(Object obj) {
		if(obj == this) {
			return true;
		}
		if(obj instanceof PLockImpl) {
			PLockImpl plock = (PLockImpl)obj;
			return key != null && key.equals(plock.getKey());
		}
		return false;
	}

	@Override
	public boolean equalsByPersistableKey(Persistable persistable) {
		return equals(persistable);
	}
}