/*******************************************************************************
 *******************************************************************************/
package at.gv.egiz.eaaf.core.api.storage;

import java.util.Date;
import java.util.List;

import at.gv.egiz.eaaf.core.exceptions.EAAFException;
import at.gv.egiz.eaaf.core.exceptions.EAAFStorageException;

/**
 * @author tlenz
 *
 */
public interface ITransactionStorage {

	/**
	 * Check if transaction storage contains a data object with a specific key
	 * 
	 * @param key Key, which identifies a data object
	 * @return true if key is found, otherwise false
	 */
	public boolean containsKey(String key);
	
	/**
	 * Store a data object with a key to transaction storage
	 * 
	 * @param key Id which identifiers the data object
	 * @param value Data object which should be stored. 
	 *              This data must implement the <code>java.io.Serializable</code> interface
	 * @param timeout_ms Defines the period of time a data object is kept within the storage
	 * @throws EAAFStorageException In case of store operation failed
	 */
	public void put(String key, Object value, int timeout_ms) throws EAAFException;
	
	/**
	 * Get a data object from transaction storage
	 * 
	 * @param key key Id which identifiers the data object
	 * @return The transaction-data object, or null
	 * @throws EAAFStorageException In case of load operation failed
	 */
	public Object get(String key) throws EAAFException;
	
	/**
	 * Get a data object from transaction storage
	 * 
	 * @param key Id which identifiers the data object
	 * @param clazz The class type which is stored with this key
	 * @return The transaction-data object from type class, or null
	 * @throws EAAFStorageException In case of load operation failed
	 */
	public <T> T get(String key, final Class<T> clazz) throws EAAFException;
	
	/**
	 * Get a data object from transaction storage
	 * 
	 * @param key Id which identifiers the data object
	 * @param clazz The class type which is stored with this key
	 * @param Data-object timeout in [ms]
	 * @return The transaction-data object from type class, or null
	 * @throws EAAFStorageException In case of load operation failed
	 */
	public <T> T get(String key, final Class<T> clazz, long dataTimeOut) throws EAAFException;
	
	
	/**
	 * Change the key of a data object and store it under the new key
	 * 
	 * @param oldKey Old key of the data object
	 * @param newKey New key, which should be used to store the data object
	 * @param value Data object which should be stored
	 * @throws EAAFStorageException In case of store operation failed
	 */
	public void changeKey(String oldKey, String newKey, Object value) throws EAAFException; 
	
	/**
	 * Remove a data object from transaction storage
	 * 
	 * @param key Id which identifiers the data object
	 */
	public void remove(String key);
	
	/**
	 * Get all entries for Clean-up the transaction storage
	 * 
	 * @param now Current time
	 * @param dataTimeOut Data-object timeout in [ms]
	 * @return List of entry-keys which as a timeout
	 */
	public List<String> clean(Date now, long dataTimeOut);
	
	
	/**
	 * Get a raw object from storage by using this key
	 * 
	 * @param key
	 * @return
	 * @throws EAAFException
	 */
	public Object getRaw(String key) throws EAAFException;
	
	
	/**
	 * Set a raw object to storage 
	 * 
	 * @param key
	 * @param element
	 * @throws EAAFException
	 */
	public void putRaw(String key, Object element) throws EAAFException;
	
	
}