/*
 * JBoss, Home of Professional Open Source
 * Copyright 2011 Red Hat Inc. and/or its affiliates and other
 * contributors as indicated by the @author tags. All rights reserved.
 * See the copyright.txt in the distribution for a full listing of
 * individual contributors.
 *
 * This 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 (at your option) any later version.
 *
 * This software 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 software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.infinispan.commands.module;

import org.infinispan.commands.ReplicableCommand;
import org.infinispan.factories.annotations.Inject;
import org.infinispan.factories.scopes.Scope;
import org.infinispan.factories.scopes.Scopes;

import java.util.Map;

/**
 * Modules which wish to implement their own commands and visitors must also provide an implementation of this interface
 * and declare it in their <tt>infinispan-module.properties</tt> file under key <tt>infinispan.module.command.factory</tt>.
 * <p />
 * Implementations <b>must</b> be public classes with a public, no-arg constructor for instantiation.
 * <p />
 * Note that this is a {@link Scopes#GLOBAL} component and as such cannot have {@link Inject} methods referring to
 * {@link Scopes#NAMED_CACHE} scoped components.  For such components, use a corresponding {@link Scopes#NAMED_CACHE}-scoped
 * {@link ModuleCommandInitializer}.
 * <p />
 * @author Manik Surtani
 * @since 5.0
 */
@Scope(Scopes.GLOBAL)
public interface ModuleCommandFactory {
   /**
    * Provides a map of command IDs to command types of all the commands handled by the command factory instance.
    * Unmarshalling requests for these command IDs will be dispatched to this implementation.
    *
    * @return map of command IDs to command types handled by this implementation.
    */
   Map<Byte, Class<? extends ReplicableCommand>> getModuleCommands();

   /**
    * Construct and initialize a {@link ReplicableCommand} based on the command
    * id and argument array passed in.
    *
    * @param commandId command id to construct
    * @param args array of arguments with which to initialize the ReplicableCommand
    * @return a ReplicableCommand
    */
   ReplicableCommand fromStream(byte commandId, Object[] args);
}