001/*
002 * HA-JDBC: High-Availability JDBC
003 * Copyright (C) 2012  Paul Ferraro
004 *
005 * This program is free software: you can redistribute it and/or modify
006 * it under the terms of the GNU Lesser General Public License as published by
007 * the Free Software Foundation, either version 3 of the License, or
008 * (at your option) any later version.
009 *
010 * This program is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
013 * GNU Lesser General Public License for more details.
014 *
015 * You should have received a copy of the GNU Lesser General Public License
016 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
017 */
018package net.sf.hajdbc.state.distributed;
019
020import java.util.Map;
021
022import net.sf.hajdbc.Database;
023import net.sf.hajdbc.distributed.Command;
024import net.sf.hajdbc.durability.InvocationEvent;
025import net.sf.hajdbc.durability.InvokerEvent;
026
027/**
028 * @author paul
029 *
030 */
031public abstract class InvocationCommand<Z, D extends Database<Z>> implements Command<Void, StateCommandContext<Z, D>>
032{
033        private static final long serialVersionUID = -1876128495499915710L;
034        
035        private final RemoteInvocationDescriptor descriptor;
036        
037        protected InvocationCommand(RemoteInvocationDescriptor descriptor)
038        {
039                this.descriptor = descriptor;
040        }
041        
042        /**
043         * {@inheritDoc}
044         * @see net.sf.hajdbc.distributed.Command#execute(java.lang.Object)
045         */
046        @Override
047        public Void execute(StateCommandContext<Z, D> context)
048        {
049                Map<InvocationEvent, Map<String, InvokerEvent>> invokers = context.getRemoteInvokers(this.descriptor);
050
051                synchronized (invokers)
052                {
053                        this.execute(invokers, this.descriptor.getEvent());
054                }
055                
056                return null;
057        }
058
059        protected abstract void execute(Map<InvocationEvent, Map<String, InvokerEvent>> invokers, InvocationEvent event);
060
061        /**
062         * {@inheritDoc}
063         * @see java.lang.Object#toString()
064         */
065        @Override
066        public String toString()
067        {
068                return String.format("%s(%s)", this.getClass().getSimpleName(), this.descriptor);
069        }
070}