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package com.sun.enterprise.transaction.jts.api;
/**
 *
 * @author mvatkina
 * Date: Sep 10, 2010
 */

/**
 * Interface to implement by delegated transaction recovery lock
 */

public interface DelegatedTransactionRecoveryFence {
    /**
     * Returns true if the specified instance on the specified path is being recovered
     * after the specified timestamp
     */
    public boolean isFenceRaised(String path, String instanceName, long timestamp);

    /**
     * Raise the fence for the specified instance on the specified path so that no other instance can
     * start delegated recovery at the same time.
     */
    public void raiseFence(String path, String instanceName);

    /**
     * Lower the fence for the specified instance on the specified path
     */
    public void lowerFence(String path, String instanceName);
        
    /**
     * Returns instance for which delegated recovery was done before the timestamp specified 
     * on the specified path or null if such instance does not exist
     */
    public String getInstanceRecoveredFor(String path, long timestamp);
        
    /**
     * If an instance was doing delegated recovery on the specified path, assign
     * specified instance instead.
     */
    public void transferRecoveryTo(String path, String instanceName);
        
}