package org.alfresco.repo.lock;

import org.alfresco.api.AlfrescoPublicApi;  
import org.alfresco.error.AlfrescoRuntimeException;
import org.alfresco.service.namespace.QName;

/**
 * Exception generated when a lock cannot be acquired.
 * 
 * @author Derek Hulley
 * @since 3.2
 */
@AlfrescoPublicApi
public class LockAcquisitionException extends AlfrescoRuntimeException
{
    private static final long serialVersionUID = 8215858379509645862L;

    /**
     * <ul>
     *   <li>1: the qname</li>
     *   <li>2: the lock token</li>
     * </ul>
     */
    public static final String ERR_FAILED_TO_ACQUIRE_LOCK = "system.locks.err.failed_to_acquire_lock";
    /**
     * <ul>
     *   <li>1: the qname</li>
     *   <li>2: the lock token</li>
     * </ul>
     */
    public static final String ERR_LOCK_RESOURCE_MISSING = "system.locks.err.lock_resource_missing";
    /**
     * <ul>
     *   <li>1: the qname</li>
     *   <li>2: the lock token</li>
     *   <li>3: the actual update count</li>
     *   <li>4: the expected update count</li>
     * </ul>
     */
    public static final String ERR_LOCK_UPDATE_COUNT = "system.locks.err.lock_update_count";
    /**
     * <ul>
     *   <li>1: the qname</li>
     *   <li>2: the lock token</li>
     * </ul>
     */
    public static final String ERR_FAILED_TO_RELEASE_LOCK = "system.locks.err.failed_to_release_lock";
    /**
     * <ul>
     *   <li>1: the qname</li>
     *   <li>2: the lock token</li>
     *   <li>3: the existing other lock</li>
     * </ul>
     */
    public static final String ERR_EXCLUSIVE_LOCK_EXISTS = "system.locks.err.excl_lock_exists";
    
    /**
     * @param lockQName             the lock that was sought
     * @param lockToken             the lock token being used
     */
    public LockAcquisitionException(QName lockQName, String lockToken)
    {
        super(ERR_FAILED_TO_ACQUIRE_LOCK, new Object[] {lockQName, lockToken});
    }

    /**
     * @param msgId                 one of the message IDs defined
     * @param args                  the arguments that apply
     */
    public LockAcquisitionException(String msgId, Object ... args)
    {
        super(msgId, args);
    }

    /**
     * @param cause                 an exception leading up to this
     * @param msgId                 one of the message IDs defined
     * @param args                  the arguments that apply
     */
    public LockAcquisitionException(Throwable cause, String msgId, Object ... args)
    {
        super(msgId, args, cause);
    }
}