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welmendswelmends
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add proxy pattern
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‎Proxy/.ipynb_checkpoints/Proxy-checkpoint.ipynb‎

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{
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"### Proxy - Forneça um substituto ou espaço reservado para outro objeto para controlar o acesso a ele ou adicionar outras responsabilidades.\n",
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"\n",
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"### Mais informações:\n",
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"- https://sourcemaking.com/design_patterns/proxy\n",
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"- https://brizeno.wordpress.com/2011/10/01/mao-na-massa-proxy/"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 1,
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"metadata": {},
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"outputs": [],
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"source": [
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"import abc"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 2,
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"metadata": {},
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"outputs": [],
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"source": [
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"# Subject - Abstract object - Communicate with client\n",
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"class Image(metaclass=abc.ABCMeta):\n",
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" @abc.abstractmethod\n",
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" def display(self):\n",
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" pass"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 3,
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"metadata": {},
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"outputs": [],
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"source": [
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"# Real Subject - Concrete object\n",
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"class RealImage(Image):\n",
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" def __init__(self, filename):\n",
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" self._filename = filename\n",
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" self.loadFromDisk()\n",
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" \n",
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" def display(self):\n",
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" print('Displaying {}'.format(self._filename))\n",
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" \n",
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" def loadFromDisk(self):\n",
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" print('... Loading {}'.format(self._filename))"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 4,
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"metadata": {},
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"outputs": [],
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"source": [
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"# Proxy\n",
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"class ProxyImage(Image):\n",
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" def __init__(self, filename):\n",
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" self._filename = filename\n",
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" self._real_image = None\n",
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"\n",
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" def display(self):\n",
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" if self._real_image == None:\n",
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" self._real_image = RealImage(self._filename)\n",
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" self._real_image.display()"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 5,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"... Loading image1.png\n",
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"Displaying image1.png\n",
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"Displaying image1.png\n",
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"... Loading image2.png\n",
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"Displaying image2.png\n",
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"Displaying image2.png\n",
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"Displaying image2.png\n"
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]
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}
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],
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"source": [
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"# Using Proxy Pattern for Image\n",
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"# Obs.: Note that it only needs to be loaded once\n",
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"\n",
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"proxy_image1 = ProxyImage('image1.png')\n",
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"proxy_image1.display()\n",
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"proxy_image1.display()\n",
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"\n",
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"proxy_image2 = ProxyImage('image2.png')\n",
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"proxy_image2.display()\n",
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"proxy_image2.display()\n",
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"proxy_image2.display()"
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]
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 3",
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"language": "python",
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"name": "python3"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.5.2"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 2
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}

‎Proxy/Proxy.ipynb‎

Lines changed: 128 additions & 0 deletions
Original file line numberDiff line numberDiff line change
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{
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"cells": [
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{
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"cell_type": "markdown",
5+
"metadata": {},
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"source": [
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"### Proxy - Forneça um substituto ou espaço reservado para outro objeto para controlar o acesso a ele ou adicionar outras responsabilidades.\n",
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"\n",
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"### Mais informações:\n",
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"- https://sourcemaking.com/design_patterns/proxy\n",
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"- https://brizeno.wordpress.com/2011/10/01/mao-na-massa-proxy/"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 1,
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"metadata": {},
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"outputs": [],
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"source": [
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"import abc"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 2,
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"metadata": {},
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"outputs": [],
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"source": [
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"# Subject - Abstract object - Communicate with client\n",
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"class Image(metaclass=abc.ABCMeta):\n",
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" @abc.abstractmethod\n",
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" def display(self):\n",
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" pass"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 3,
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"metadata": {},
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"outputs": [],
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"source": [
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"# Real Subject - Concrete object\n",
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"class RealImage(Image):\n",
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" def __init__(self, filename):\n",
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" self._filename = filename\n",
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" self.loadFromDisk()\n",
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" \n",
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" def display(self):\n",
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" print('Displaying {}'.format(self._filename))\n",
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" \n",
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" def loadFromDisk(self):\n",
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" print('... Loading {}'.format(self._filename))"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 4,
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"metadata": {},
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"outputs": [],
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"source": [
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"# Proxy\n",
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"class ProxyImage(Image):\n",
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" def __init__(self, filename):\n",
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" self._filename = filename\n",
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" self._real_image = None\n",
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"\n",
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" def display(self):\n",
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" if self._real_image == None:\n",
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" self._real_image = RealImage(self._filename)\n",
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" self._real_image.display()"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 5,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"... Loading image1.png\n",
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"Displaying image1.png\n",
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"Displaying image1.png\n",
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"... Loading image2.png\n",
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"Displaying image2.png\n",
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"Displaying image2.png\n",
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"Displaying image2.png\n"
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]
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}
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],
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"source": [
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"# Using Proxy Pattern for Image\n",
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"# Obs.: Note that it only needs to be loaded once\n",
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"\n",
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"proxy_image1 = ProxyImage('image1.png')\n",
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"proxy_image1.display()\n",
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"proxy_image1.display()\n",
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"\n",
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"proxy_image2 = ProxyImage('image2.png')\n",
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"proxy_image2.display()\n",
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"proxy_image2.display()\n",
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"proxy_image2.display()"
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]
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 3",
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"language": "python",
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"name": "python3"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.5.2"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 2
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}

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