# ApplicationServiceBase.java

    /*
     * Copyright 2015 Aroma Tech.
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     *      http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */

    package tech.aroma.application.service;

    import java.util.concurrent.ExecutorService;
    import javax.inject.Inject;
    import org.apache.thrift.TException;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import tech.aroma.thrift.application.service.ApplicationService;
    import tech.aroma.thrift.application.service.SendMessageRequest;
    import tech.aroma.thrift.application.service.SendMessageResponse;
    import tech.aroma.thrift.exceptions.InvalidArgumentException;
    import tech.aroma.thrift.exceptions.InvalidCredentialsException;
    import tech.aroma.thrift.exceptions.OperationFailedException;
    import tech.aroma.thrift.service.AromaServiceConstants;
    import tech.sirwellington.alchemy.annotations.access.Internal;
    import tech.sirwellington.alchemy.annotations.designs.patterns.DecoratorPattern;
    import tech.sirwellington.alchemy.thrift.operations.ThriftOperation;

    import static tech.aroma.application.service.ApplicationAssertions.withMessage;
    import static tech.sirwellington.alchemy.annotations.designs.patterns.DecoratorPattern.Role.CONCRETE_COMPONENT;
    import static tech.sirwellington.alchemy.arguments.Arguments.checkThat;
    import static tech.sirwellington.alchemy.arguments.assertions.Assertions.notNull;

    /**
     * The  Application Service Base is the Concrete Component. It is fully functional
     * on its own, but can be decorated to add additional features.
     *
     * @see AuthenticationLayer
     * @author SirWellington
     */
    @Internal
    @DecoratorPattern(role = CONCRETE_COMPONENT)
    final class ApplicationServiceBase implements ApplicationService.Iface
    {

        private final static Logger LOG = LoggerFactory.getLogger(ApplicationServiceBase.class);

        private final ThriftOperation<SendMessageRequest, SendMessageResponse> sendMessageOperation;
        private final ExecutorService executor;

        @Inject
        ApplicationServiceBase(ThriftOperation<SendMessageRequest, SendMessageResponse> sendMessageOperation,
                               ExecutorService executor)
        {
            checkThat(executor, sendMessageOperation)
                .are(notNull());

            this.sendMessageOperation = sendMessageOperation;
            this.executor = executor;
        }

        @Override
        public double getApiVersion() throws TException
        {
            return AromaServiceConstants.API_VERSION;
        }

        @Override
        public SendMessageResponse sendMessage(SendMessageRequest request) throws OperationFailedException,
                                                                                  InvalidArgumentException,
                                                                                  InvalidCredentialsException,
                                                                                  TException
        {
            LOG.debug("Received request to send message: {}", request);

            checkThat(request)
                .throwing(withMessage("request is missing"))
                .is(notNull());

            return sendMessageOperation.process(request);
        }

        @Override
        public void sendMessageAsync(SendMessageRequest request) throws TException
        {
            if (request == null)
            {
                LOG.warn("Received null request");
                return;
            }

            executor.submit(() -> this.sendMessage(request));
        }

    }