public NioServerSocketChannel(ServerSocketChannel channel) {super(null, channel, SelectionKey.OP_ACCEPT);config = new NioServerSocketChannelConfig(this, javaChannel().socket());
}

private NioServerSocketChannelConfig(NioServerSocketChannel channel, ServerSocket javaSocket) {super(channel, javaSocket);
}

public DefaultServerSocketChannelConfig(ServerSocketChannel channel, ServerSocket javaSocket) {super(channel);if (javaSocket == null) {throw new NullPointerException("javaSocket");}this.javaSocket = javaSocket;
}

public DefaultChannelConfig(Channel channel) {this(channel, new AdaptiveRecvByteBufAllocator());
}

public AdaptiveRecvByteBufAllocator() {//DEFAULT_MINIMUM:最小缓冲区长度64字节//DEFAULT_INITIAL:初始容量1024字节//最大容量65536字节this(DEFAULT_MINIMUM, DEFAULT_INITIAL, DEFAULT_MAXIMUM);
}

public AdaptiveRecvByteBufAllocator(int minimum, int initial, int maximum) {//忽略验证代码//最小容量在table中的下标int minIndex = getSizeTableIndex(minimum);if (SIZE_TABLE[minIndex] < minimum) {this.minIndex = minIndex + 1;} else {this.minIndex = minIndex;}//最大容量在table中的下标int maxIndex = getSizeTableIndex(maximum);if (SIZE_TABLE[maxIndex] > maximum) {this.maxIndex = maxIndex - 1;} else {this.maxIndex = maxIndex;}this.initial = initial;
}

private static final int[] SIZE_TABLE;

static {//List集合List<Integer> sizeTable = new ArrayList<Integer>();//从16开始, 每递增16添加到List中, 直到大于等于512for (int i = 16; i < 512; i += 16) {sizeTable.add(i);}//从512开始, 倍增添加到List中, 直到内存溢出for (int i = 512; i > 0; i <<= 1) {sizeTable.add(i);}//初始化数组SIZE_TABLE = new int[sizeTable.size()];//将list的内容放入数组中for (int i = 0; i < SIZE_TABLE.length; i ++) {SIZE_TABLE[i] = sizeTable.get(i);}
}

for (int i = 16; i < 512; i += 16) {sizeTable.add(i);
}

for (int i = 512; i > 0; i <<= 1) {sizeTable.add(i);
}

public AdaptiveRecvByteBufAllocator(int minimum, int initial, int maximum) {//忽略验证代码//最小容量在table中的下标int minIndex = getSizeTableIndex(minimum);if (SIZE_TABLE[minIndex] < minimum) {this.minIndex = minIndex + 1;} else {this.minIndex = minIndex;}//最大容量在table中的下标int maxIndex = getSizeTableIndex(maximum);if (SIZE_TABLE[maxIndex] > maximum) {this.maxIndex = maxIndex - 1;} else {this.maxIndex = maxIndex;}this.initial = initial;
}

private static int getSizeTableIndex(final int size) {for (int low = 0, high = SIZE_TABLE.length - 1;;) {if (high < low) {return low;}if (high == low) {return high;}int mid = low + high >>> 1;int a = SIZE_TABLE[mid];int b = SIZE_TABLE[mid + 1];if (size > b) {low = mid + 1;} else if (size < a) {high = mid - 1;} else if (size == a) {return mid;} else {return mid + 1;}}
}

public DefaultChannelConfig(Channel channel) {this(channel, new AdaptiveRecvByteBufAllocator());
}

protected DefaultChannelConfig(Channel channel, RecvByteBufAllocator allocator) {setRecvByteBufAllocator(allocator, channel.metadata());this.channel = channel;
}

public ChannelMetadata metadata() {return METADATA;
}

private static final ChannelMetadata METADATA = new ChannelMetadata(false, 16);

public ChannelMetadata(boolean hasDisconnect, int defaultMaxMessagesPerRead) {//省略验证代码//falsethis.hasDisconnect = hasDisconnect;//16this.defaultMaxMessagesPerRead = defaultMaxMessagesPerRead;
}

protected DefaultChannelConfig(Channel channel, RecvByteBufAllocator allocator) {setRecvByteBufAllocator(allocator, channel.metadata());this.channel = channel;
}

private void setRecvByteBufAllocator(RecvByteBufAllocator allocator, ChannelMetadata metadata) {if (allocator instanceof MaxMessagesRecvByteBufAllocator) {((MaxMessagesRecvByteBufAllocator) allocator).maxMessagesPerRead(metadata.defaultMaxMessagesPerRead());} else if (allocator == null) {throw new NullPointerException("allocator");}rcvBufAllocator = allocator;
}

public MaxMessagesRecvByteBufAllocator maxMessagesPerRead(int maxMessagesPerRead) {//忽略验证代码//初始化为16this.maxMessagesPerRead = maxMessagesPerRead;return this;
}

private void setRecvByteBufAllocator(RecvByteBufAllocator allocator, ChannelMetadata metadata) {if (allocator instanceof MaxMessagesRecvByteBufAllocator) {((MaxMessagesRecvByteBufAllocator) allocator).maxMessagesPerRead(metadata.defaultMaxMessagesPerRead());} else if (allocator == null) {throw new NullPointerException("allocator");}rcvBufAllocator = allocator;
}