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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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 org.apache.sshd.mina;

import java.nio.channels.spi.SelectorProvider;
import java.util.concurrent.Executor;

import org.apache.mina.core.service.IoProcessor;
import org.apache.mina.core.service.SimpleIoProcessorPool;
import org.apache.mina.transport.socket.nio.NioProcessor;
import org.apache.mina.transport.socket.nio.NioSession;
import org.apache.sshd.common.FactoryManager;
import org.apache.sshd.common.io.AbstractIoServiceFactory;
import org.apache.sshd.common.io.IoAcceptor;
import org.apache.sshd.common.io.IoConnector;
import org.apache.sshd.common.io.IoHandler;
import org.apache.sshd.common.util.threads.CloseableExecutorService;
import org.apache.sshd.common.util.threads.ThreadUtils;

/**
 * A factory for creating Apache MINA I/O service ({@link MinaAcceptor} and {@link MinaConnector}) instances.
 *
 * @author Apache MINA SSHD Project
 */
public class MinaServiceFactory extends AbstractIoServiceFactory {

    private final IoProcessor ioProcessor;

    public MinaServiceFactory(FactoryManager factoryManager, CloseableExecutorService service) {
        super(factoryManager, ThreadUtils.newCachedThreadPoolIf(service, factoryManager.toString() + "-mina"));
        ioProcessor
                = new SimpleIoProcessorPool<>(MinaProcessor.class, getExecutorService(), getNioWorkers(factoryManager), null);
    }

    @Override
    public IoConnector createConnector(IoHandler handler) {
        return autowireCreatedService(new MinaConnector(getFactoryManager(), handler, ioProcessor));
    }

    @Override
    public IoAcceptor createAcceptor(IoHandler handler) {
        return autowireCreatedService(new MinaAcceptor(getFactoryManager(), handler, ioProcessor));
    }

    @Override
    protected void doCloseImmediately() {
        try {
            ioProcessor.dispose();
        } catch (Exception e) {
            log.debug("Exception caught while disposing IoProcessor pool", e);
        } finally {
            super.doCloseImmediately();
        }
    }

    protected static class MinaProcessor extends NioProcessor {

        public MinaProcessor(Executor executor) {
            super(executor);
        }

        public MinaProcessor(Executor executor, SelectorProvider selectorProvider) {
            super(executor, selectorProvider);
        }

        @Override
        protected void setInterestedInRead(NioSession session, boolean isInterested) throws Exception {
            boolean startReading = isInterested && !isInterestedInRead(session);
            super.setInterestedInRead(session, isInterested);
            if (startReading) {
                // Make sure the socket gets added to the selector right away, and not just once the
                // current select() call times out after a second.
                wakeup();
            }
        }

    }
}