裝飾者模式要點回顧：

1、裝飾者和被裝飾者實現同一個接口。

2、裝飾者通常繼承被裝飾者，同宗同源。

3、動態修改、重載被裝飾者的方法。

WrappedByteBuf :

class WrappedByteBuf extends ByteBuf {protected final ByteBuf buf;protected WrappedByteBuf(ByteBuf buf) {if(buf == null) {throw new NullPointerException("buf");} else {this.buf = buf;}}... }

UnreleasableByteBuf :

final class UnreleasableByteBuf extends WrappedByteBuf {private SwappedByteBuf swappedBuf;UnreleasableByteBuf(ByteBuf buf) {super(buf);}...public boolean release() {return false;}public boolean release(int decrement) {return false;} }

SimpleakAwareByteBuf:

final class SimpleLeakAwareByteBuf extends WrappedByteBuf {private final ResourceLeak leak;SimpleLeakAwareByteBuf(ByteBuf buf, ResourceLeak leak) {super(buf);this.leak = leak;}...public boolean release() {boolean deallocated = super.release();if(deallocated) {this.leak.close();}return deallocated;}public boolean release(int decrement) {boolean deallocated = super.release(decrement);if(deallocated) {this.leak.close();}return deallocated;} }

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