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/*
 * Copyright (c) 2014. Vlad Ilyushchenko
 *
 * 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 com.nfsdb.journal.net;

import com.nfsdb.journal.logging.Logger;

import java.io.IOException;
import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.WritableByteChannel;

class StatsCollectingWritableByteChannel implements WritableByteChannel {

    private final static Logger LOGGER = Logger.getLogger(StatsCollectingWritableByteChannel.class);

    private final SocketAddress socketAddress;
    private WritableByteChannel delegate;
    private long startTime;
    private long byteCount;

    public StatsCollectingWritableByteChannel(SocketAddress socketAddress) {
        this.socketAddress = socketAddress;
    }

    @Override
    public int write(ByteBuffer src) throws IOException {
        int count = delegate.write(src);
        this.byteCount += count;
        return count;
    }

    @Override
    public boolean isOpen() {
        return delegate.isOpen();
    }

    @Override
    public void close() throws IOException {
        delegate.close();
    }

    public void setDelegate(WritableByteChannel delegate) {
        this.delegate = delegate;
        this.startTime = System.currentTimeMillis();
        this.byteCount = 0;
    }

    public void logStats() {
        if (byteCount > 10) {
            long endTime = System.currentTimeMillis();
            LOGGER.info("sent %d bytes @ %f MB/s to: %s", byteCount, (double) (byteCount * 1000) / ((endTime - startTime)) / 1024 / 1024, socketAddress);
        }
    }

}