/*
* JORAM: Java(TM) Open Reliable Asynchronous Messaging
* Copyright (C) 2009 ScalAgent Distributed Technologies
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA.
*
* Initial developer(s): ScalAgent Distributed Technologies
* Contributor(s):
*/
package fr.dyade.aaa.util;
import java.io.Serializable;
import fr.dyade.aaa.common.Pool;
/**
* This class describes an operation in the transaction log.
*/
public class Operation implements Serializable {
/** define serialVersionUID for interoperability */
private static final long serialVersionUID = 1L;
public static final int SAVE = 1;
public static final int CREATE = 4;
public static final int DELETE = 2;
public static final int NOOP = 5; // Create then delete
public static final int COMMIT = 3;
public static final int END = 127;
/** Type of the operation. */
public int type;
/** Relative path of the object if any, null otherwise. */
public String dirName;
/** Name of the object */
public String name;
/** Binary representation of the object (only for create and save operation). */
public byte[] value;
// Actually the value below are only needed for NGTransaction
// Index of the log file recording the operation.
public int logidx;
// Pointer of the operation in the log file.
public int logptr;
private Operation(int type, String dirName, String name, byte[] value) {
this.type = type;
this.dirName = dirName;
this.name = name;
this.value = value;
}
/**
* Returns a string representation for this object.
*
* @return A string representation of this object.
*/
public String toString() {
StringBuffer strbuf = new StringBuffer();
strbuf.append('(').append(super.toString());
strbuf.append(",type=").append(type);
strbuf.append(",dirName=").append(dirName);
strbuf.append(",name=").append(name);
strbuf.append(",logidx=").append(logidx);
strbuf.append(')');
return strbuf.toString();
}
private static Pool pool = null;
public static void initPool(int LogThresholdOperation) {
pool = new Pool("Transaction$Operation", LogThresholdOperation);
}
public static Operation alloc(int type, String dirName, String name) {
return alloc(type, dirName, name, null);
}
public static Operation alloc(int type,
String dirName, String name,
byte[] value) {
Operation op = null;
try {
op = (Operation) pool.allocElement();
} catch (Exception exc) {
return new Operation(type, dirName, name, value);
}
op.type = type;
op.dirName = dirName;
op.name = name;
op.value = value;
return op;
}
public void free() {
/* to let gc do its work */
dirName = null;
name = null;
value = null;
pool.freeElement(this);
}
}