com.github.bloodshura.x.venus.library.std.WaitAttribution Maven / Gradle / Ivy

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A dynamic, easy, highly customizable scripting language.
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/*
 * Copyright (c) 2013-2018, João Vitor Verona Biazibetti - All Rights Reserved
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see .
 *
 * https://www.github.com/BloodShura
 */

package com.github.bloodshura.x.venus.library.std;

import com.github.bloodshura.x.activity.logging.XLogger;
import com.github.bloodshura.x.collection.list.XList;
import com.github.bloodshura.x.collection.list.impl.XArrayList;
import com.github.bloodshura.x.venus.exception.runtime.InvalidFunctionParameterException;
import com.github.bloodshura.x.venus.exception.runtime.ScriptRuntimeException;
import com.github.bloodshura.x.venus.executor.Context;
import com.github.bloodshura.x.venus.expression.BinaryOperation;
import com.github.bloodshura.x.venus.expression.Expression;
import com.github.bloodshura.x.venus.expression.FunctionCall;
import com.github.bloodshura.x.venus.expression.UnaryOperation;
import com.github.bloodshura.x.venus.expression.Variable;
import com.github.bloodshura.x.venus.function.FunctionCallDescriptor;
import com.github.bloodshura.x.venus.function.VoidMethod;
import com.github.bloodshura.x.venus.function.annotation.MethodArgs;
import com.github.bloodshura.x.venus.function.annotation.MethodName;
import com.github.bloodshura.x.venus.value.BoolValue;
import com.github.bloodshura.x.venus.value.Value;

@MethodArgs(Value.class)
@MethodName("wait")
public class WaitAttribution extends VoidMethod {
	@Override
	public void callVoid(Context context, FunctionCallDescriptor descriptor) throws ScriptRuntimeException {
		Expression expression = descriptor.getExpressions().get(0);
		XList list = new XArrayList<>();
		Object lock = new Object();

		scan(context, expression, list);
		list.forEachExceptional(variable -> context.getVar(variable).addChangeMonitor(lock));

		Value value = expression.resolve(context); // Maybe value changed after it was resolved.

		while (!(value instanceof BoolValue && ((BoolValue) value).value())) {
			try {
				synchronized (lock) {
					lock.wait();
				}
			}
			catch (InterruptedException exception) {
				XLogger.warnln("Thread " + Thread.currentThread() + " interrupted while 'wait' was locking.");

				break;
			}

			value = expression.resolve(context);
		}

		list.forEachExceptional(variable -> context.getVar(variable).removeChangeMonitor(lock));
	}

	private void scan(Context context, Expression expression, XList list) throws ScriptRuntimeException {
		if (expression instanceof BinaryOperation) {
			BinaryOperation operation = (BinaryOperation) expression;

			scan(context, operation.getLeft(), list);
			scan(context, operation.getRight(), list);
		}
		else if (expression instanceof FunctionCall) {
			throw new InvalidFunctionParameterException(context, "Cannot embed a function call on arguments for 'wait' method");
		}
		else if (expression instanceof UnaryOperation) {
			UnaryOperation operation = (UnaryOperation) expression;

			scan(context, operation.getExpression(), list);
		}
		else if (expression instanceof Variable) {
			list.add((Variable) expression);
		}
	}
}