/*
 * 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.plc4x.java.transport.serial;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.nio.channels.SelectableChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.spi.AbstractSelectionKey;

class SerialSelectionKey extends AbstractSelectionKey {

    private static final Logger logger = LoggerFactory.getLogger(SerialSelectionKey.class);

    final SelectableChannel channel;
    final Selector selector;
    int index;
    private volatile int interestOps;
    private int readyOps;

    SerialSelectionKey(SelectableChannel channel, Selector selector, int interestOps) {
        this.channel = channel;
        this.selector = selector;
        this.interestOps = interestOps;
    }

    public void setIndex(int index) {
        this.index = index;
    }

    @Override
    public SelectableChannel channel() {
        return this.channel;
    }

    @Override
    public Selector selector() {
        return this.selector;
    }

    @Override
    public int interestOps() {
        return this.interestOps;
    }

    @Override
    public SelectionKey interestOps(int ops) {
        this.interestOps = ops;
        return this;
    }

    @Override
    public int readyOps() {
        final int ops = this.readyOps;
        this.readyOps = 0;
        // Reset events for this here in Selector
        ((SerialPollingSelector) selector).removeEvent(this);
        logger.debug("Returning ready operation {}", ops);
        return ops;
    }

    public void addReadyOp(int event) {
        readyOps = readyOps | event;
        logger.debug("Adding event {} to ready ops, now having ready ops {}", event, readyOps);
    }

}
