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The Java operations layer for the MongoDB Java Driver. Third parties can ' + 'wrap this layer to provide custom higher-level APIs
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/*
 * Copyright 2008-present MongoDB, Inc.
 *
 * 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.mongodb.internal.connection;

import com.mongodb.MongoSocketException;
import com.mongodb.MongoSocketOpenException;
import com.mongodb.MongoSocketReadException;
import com.mongodb.ServerAddress;
import com.mongodb.connection.AsyncCompletionHandler;
import com.mongodb.connection.BufferProvider;
import com.mongodb.connection.SocketSettings;
import com.mongodb.connection.SslSettings;
import com.mongodb.connection.Stream;
import org.bson.ByteBuf;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.SocketTimeoutException;
import java.nio.ByteBuffer;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
import java.util.List;

import static com.mongodb.assertions.Assertions.isTrue;
import static com.mongodb.assertions.Assertions.notNull;

public class SocketChannelStream implements Stream {
    private final ServerAddress address;
    private final SocketSettings settings;
    private final SslSettings sslSettings;
    private final BufferProvider bufferProvider;
    private volatile SocketChannel socketChannel;
    private volatile boolean isClosed;

    public SocketChannelStream(final ServerAddress address, final SocketSettings settings, final SslSettings sslSettings,
                        final BufferProvider bufferProvider) {
        this.address = notNull("address", address);
        this.settings = notNull("settings", settings);
        this.sslSettings = notNull("sslSettings", sslSettings);
        this.bufferProvider = notNull("bufferProvider", bufferProvider);
    }

    @Override
    public void open() {
        try {
            socketChannel = initializeSocketChannel();
        } catch (IOException e) {
            close();
            throw new MongoSocketOpenException("Exception opening socket", getAddress(), e);
        }
    }

    private SocketChannel initializeSocketChannel() throws IOException {
        Iterator inetSocketAddresses = address.getSocketAddresses().iterator();
        while (inetSocketAddresses.hasNext()) {
            SocketChannel socketChannel = SocketChannel.open();
            try {
                SocketStreamHelper.initialize(socketChannel.socket(), inetSocketAddresses.next(), settings, sslSettings);
                return socketChannel;
            } catch (SocketTimeoutException e) {
                if (!inetSocketAddresses.hasNext()) {
                    throw e;
                }
            }
        }

        throw new MongoSocketException("Exception opening socket", getAddress());
    }

    @Override
    public ByteBuf getBuffer(final int size) {
        return bufferProvider.getBuffer(size);
    }

    @Override
    public void write(final List buffers) throws IOException {
        isTrue("open", !isClosed());

        int totalSize = 0;
        ByteBuffer[] byteBufferArray = new ByteBuffer[buffers.size()];
        for (int i = 0; i < buffers.size(); i++) {
            byteBufferArray[i] = buffers.get(i).asNIO();
            totalSize += byteBufferArray[i].limit();
        }

        long bytesRead = 0;
        while (bytesRead < totalSize) {
            bytesRead += socketChannel.write(byteBufferArray);
        }
    }

    @Override
    public ByteBuf read(final int numBytes) throws IOException {
        ByteBuf buffer = bufferProvider.getBuffer(numBytes);
        isTrue("open", !isClosed());

        int totalBytesRead = 0;
        while (totalBytesRead < buffer.limit()) {
            int bytesRead = socketChannel.read(buffer.asNIO());
            if (bytesRead == -1) {
                buffer.release();
                throw new MongoSocketReadException("Prematurely reached end of stream", getAddress());
            }
            totalBytesRead += bytesRead;
        }
        return buffer.flip();
    }

    @Override
    public void openAsync(final AsyncCompletionHandler handler) {
        throw new UnsupportedOperationException(getClass() + " does not support asynchronous operations.");
    }

    @Override
    public void writeAsync(final List buffers, final AsyncCompletionHandler handler) {
        throw new UnsupportedOperationException(getClass() + " does not support asynchronous operations.");
    }

    @Override
    public void readAsync(final int numBytes, final AsyncCompletionHandler handler) {
        throw new UnsupportedOperationException(getClass() + " does not support asynchronous operations.");
    }

    @Override
    public ServerAddress getAddress() {
        return address;
    }

    SocketSettings getSettings() {
        return settings;
    }

    void setSocketChannel(final SocketChannel socketChannel) {
        this.socketChannel = socketChannel;
    }

    @Override
    public void close() {
        try {
            isClosed = true;
            if (socketChannel != null) {
                socketChannel.close();
            }
        } catch (IOException e) {
            // ignore
        }
    }

    @Override
    public boolean isClosed() {
        return isClosed;
    }
}