CMethodAction.java
- /*
- * @cond LICENSE
- * ######################################################################################
- * # LGPL License #
- * # #
- * # This file is part of the LightJason AgentSpeak(L++) #
- * # Copyright (c) 2015-19, LightJason (info@lightjason.org) #
- * # This program 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 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 Lesser General Public License for more details. #
- * # #
- * # You should have received a copy of the GNU Lesser General Public License #
- * # along with this program. If not, see http://www.gnu.org/licenses/ #
- * ######################################################################################
- * @endcond
- */
- package org.lightjason.agentspeak.action.binding;
- import org.lightjason.agentspeak.action.IBaseAction;
- import org.lightjason.agentspeak.common.CPath;
- import org.lightjason.agentspeak.common.IPath;
- import org.lightjason.agentspeak.language.CRawTerm;
- import org.lightjason.agentspeak.language.ITerm;
- import org.lightjason.agentspeak.language.execution.IContext;
- import org.lightjason.agentspeak.language.fuzzy.CFuzzyValue;
- import org.lightjason.agentspeak.language.fuzzy.IFuzzyValue;
- import javax.annotation.Nonnegative;
- import javax.annotation.Nonnull;
- import javax.annotation.Nullable;
- import java.io.IOException;
- import java.io.ObjectInputStream;
- import java.io.ObjectOutputStream;
- import java.lang.invoke.MethodHandle;
- import java.lang.invoke.MethodHandles;
- import java.lang.reflect.Method;
- import java.text.MessageFormat;
- import java.util.List;
- import java.util.Locale;
- import java.util.Objects;
- import java.util.stream.Collectors;
- import java.util.stream.Stream;
- /**
- * action for binding a method.
- * action uses agent for object binding
- */
- public final class CMethodAction extends IBaseAction
- {
- /**
- * serial id
- */
- private static final long serialVersionUID = -507236338411690842L;
- /**
- * name of the action
- */
- private final IPath m_name;
- /**
- * number of arguments
- */
- private final int m_arguments;
- /**
- * method reference
- */
- private transient Method m_method;
- /**
- * method handle
- */
- private transient MethodHandle m_methodhandle;
- /**
- * ctor
- *
- * @param p_method method reference
- * @throws IllegalAccessException on method access error
- */
- public CMethodAction( @Nonnull final Method p_method ) throws IllegalAccessException
- {
- m_method = p_method;
- m_arguments = m_method.getParameterCount();
- m_name = CPath.from(
- m_method.isAnnotationPresent( IAgentActionName.class ) && !m_method.getAnnotation( IAgentActionName.class ).name().isEmpty()
- ? m_method.getAnnotation( IAgentActionName.class ).name().toLowerCase( Locale.ROOT )
- : m_method.getName().toLowerCase( Locale.ROOT )
- );
- m_methodhandle = MethodHandles.lookup().unreflect( m_method );
- }
- /**
- * serialize call
- *
- * @param p_stream object stream
- * @throws IOException error on writing object data
- */
- private void writeObject( final ObjectOutputStream p_stream ) throws IOException
- {
- p_stream.defaultWriteObject();
- // serialize method handle
- p_stream.writeObject( m_method.getDeclaringClass() );
- p_stream.writeUTF( m_method.getName() );
- p_stream.writeObject( m_method.getParameterTypes() );
- }
- /**
- * deserializable call
- *
- * @param p_stream object stream
- * @throws IOException is thrown on io error
- * @throws ClassNotFoundException is thrown on deserialization error
- * @throws NoSuchMethodException is thrown on method deserialization
- * @throws IllegalAccessException is thrown on creating method handle
- */
- @SuppressWarnings( "unchecked" )
- private void readObject( final ObjectInputStream p_stream ) throws IOException, ClassNotFoundException, NoSuchMethodException, IllegalAccessException
- {
- p_stream.defaultReadObject();
- // deserialize method handle
- m_method = ( (Class<?>) p_stream.readObject() ).getMethod( p_stream.readUTF(), (Class<?>[])p_stream.readObject() );
- m_methodhandle = MethodHandles.lookup().unreflect( m_method );
- }
- @Nonnull
- @Override
- public final IPath name()
- {
- return m_name;
- }
- @Nonnegative
- @Override
- public final int minimalArgumentNumber()
- {
- return m_arguments;
- }
- @Nonnull
- @Override
- public IFuzzyValue<Boolean> execute( final boolean p_parallel, @Nonnull final IContext p_context,
- @Nonnull final List<ITerm> p_argument, @Nonnull final List<ITerm> p_return
- )
- {
- try
- {
- return m_arguments == 0
- ? CMethodAction.returnvalues(
- m_methodhandle.invoke( p_context.agent() ),
- p_return
- )
- : CMethodAction.returnvalues(
- m_methodhandle.invokeWithArguments(
- Stream.concat(
- Stream.of( p_context.agent() ),
- p_argument.stream().map( ITerm::raw )
- ).collect( Collectors.toList() )
- ),
- p_return
- );
- }
- catch ( final Throwable l_throwable )
- {
- LOGGER.warning( MessageFormat.format( "binding method [{0}] throws error [{1}] in agent: ", m_name, l_throwable, p_context.agent() ) );
- return CFuzzyValue.from( false );
- }
- }
- /**
- * creates the returns values of the execution
- *
- * @param p_result return object of the invoke call
- * @param p_return return argument list
- * @return execution return
- */
- @Nonnull
- private static IFuzzyValue<Boolean> returnvalues( @Nullable final Object p_result, @Nonnull final List<ITerm> p_return )
- {
- // void result of the execution
- if ( ( Objects.isNull( p_result ) ) || ( void.class.equals( p_result.getClass() ) ) )
- return CFuzzyValue.from( true );
- // otherwise object is returned
- p_return.add( CRawTerm.from( p_result ) );
- return CFuzzyValue.from( true );
- }
- }