EnvironmentCallTask.java

/*
 * Created by Andrey Cherkashin (acherkashin)
 * http://acherkashin.me
 * 
 * License
 * Copyright (c) 2015 Andrey Cherkashin
 * The project released under the MIT license: http://opensource.org/licenses/MIT
 */
package ragefist.core.environment;

import org.luaj.vm2.LuaTable;
import org.luaj.vm2.LuaValue;
import ragefist.core.Processor;
import ragefist.core.ProcessorTask;

/**
 * EnvironmentCallTask is used to make calls to a Lua environment
 * @author acherkashin
 */
public class EnvironmentCallTask extends ProcessorTask {
	protected final String _lua;
	protected final LuaTable _args;
	
	// ---------------------------------------------------------------------- //
	// PUBLIC
	// ---------------------------------------------------------------------- //

	public EnvironmentCallTask() {
		this(null);
	}
	
	public EnvironmentCallTask(String luaCommand) {
		this(luaCommand, null);
	}
	
	public EnvironmentCallTask(String luaCommand, LuaTable args) {
		super();
		setAsync(true);
		_lua = luaCommand;
		_args = args;
	}

	@Override
	public boolean _executeImpl(Processor processor) {
		EnvironmentProcessor target = (EnvironmentProcessor)processor;
		String lua = 
		"do local arg = ...;\n"+
		"Processor.addTask(function()\n" +
			"local fn = function(args) "+_lua+" end;\n" +
			"Processor.onTaskFinish(arg[1], fn(arg[2]))\n" + 
		"end); end;\n";
		
		LuaValue[] args;
		if (_args != null) {
			args = new LuaValue[] { LuaValue.userdataOf(this), _args };
		} else {
			args = new LuaValue[] { LuaValue.userdataOf(this) };
		}
		target.getGlobals().load(lua).invoke(LuaTable.listOf(args));
		return true;
	}
}