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| #!/usr/bin/env perl
use v5.36;
# 天気サービスの共通インターフェース（Role）
package WeatherAdapter::Role {
use v5.36;
use Moo::Role;
requires 'get_weather';
requires 'name';
}
# OpenWeatherMap用Adapter
package WeatherAdapter::OpenWeatherMap {
use v5.36;
use Moo;
has name => (is => 'ro', default => 'OpenWeatherMap');
with 'WeatherAdapter::Role';
sub _get_raw_data ($self, $city) {
my %mock_data = (
'Tokyo' => { name => 'Tokyo', main => { temp => 25.5, humidity => 60 }, weather => [{ description => '晴れ' }] },
'Osaka' => { name => 'Osaka', main => { temp => 27.2, humidity => 65 }, weather => [{ description => '曇り' }] },
'Nagoya' => { name => 'Nagoya', main => { temp => 26.8, humidity => 62 }, weather => [{ description => '晴れ' }] },
);
return $mock_data{$city};
}
sub get_weather ($self, $city) {
my $data = $self->_get_raw_data($city);
return unless $data;
return {
city => $data->{name},
temperature => $data->{main}{temp},
humidity => $data->{main}{humidity},
condition => $data->{weather}[0]{description},
source => $self->name,
};
}
}
# WeatherStack用Adapter
package WeatherAdapter::WeatherStack {
use v5.36;
use Moo;
has name => (is => 'ro', default => 'WeatherStack');
with 'WeatherAdapter::Role';
sub _get_raw_data ($self, $city) {
my %mock_data = (
'Tokyo' => { location => { name => 'Tokyo' }, current => { temperature => 26, humidity => 58, weather_descriptions => ['Sunny'] } },
'Sapporo' => { location => { name => 'Sapporo' }, current => { temperature => 19, humidity => 68, weather_descriptions => ['Rain'] } },
'Sendai' => { location => { name => 'Sendai' }, current => { temperature => 22, humidity => 65, weather_descriptions => ['Cloudy'] } },
);
return $mock_data{$city};
}
sub get_weather ($self, $city) {
my $data = $self->_get_raw_data($city);
return unless $data;
return {
city => $data->{location}{name},
temperature => $data->{current}{temperature},
humidity => $data->{current}{humidity},
condition => $data->{current}{weather_descriptions}[0],
source => $self->name,
};
}
}
# キャッシュ付きFacade
package WeatherFacade {
use v5.36;
use Moo;
has adapters => (is => 'ro', required => 1);
has cache_ttl => (is => 'ro', default => 300); # 5分
has max_size => (is => 'ro', default => 100); # 最大100エントリ
has _cache => (is => 'ro', default => sub { {} });
has _cache_order => (is => 'ro', default => sub { [] }); # LRU順序管理
has _stats => (is => 'ro', default => sub { { hits => 0, misses => 0 } });
# キャッシュから取得（LRU更新）
sub _get_from_cache ($self, $city) {
return unless exists $self->_cache->{$city};
my $cached = $self->_cache->{$city};
my $age = time() - $cached->{cached_at};
if ($age >= $self->cache_ttl) {
# 期限切れ
$self->_remove_from_cache($city);
return;
}
# LRU順序を更新（最近使用したものを末尾に）
$self->_cache_order->@* = grep { $_ ne $city } $self->_cache_order->@*;
push $self->_cache_order->@*, $city;
return $cached->{data};
}
# キャッシュに保存
sub _set_to_cache ($self, $city, $data) {
# サイズ上限チェック
while (scalar($self->_cache_order->@*) >= $self->max_size) {
my $oldest = shift $self->_cache_order->@*;
delete $self->_cache->{$oldest};
}
$self->_cache->{$city} = {
data => $data,
cached_at => time(),
};
push $self->_cache_order->@*, $city;
}
# キャッシュから削除
sub _remove_from_cache ($self, $city) {
delete $self->_cache->{$city};
$self->_cache_order->@* = grep { $_ ne $city } $self->_cache_order->@*;
}
# 天気情報を取得
sub get_weather ($self, $city) {
# キャッシュチェック
if (my $cached = $self->_get_from_cache($city)) {
$self->_stats->{hits}++;
return { $cached->%*, from_cache => 1 };
}
$self->_stats->{misses}++;
# APIから取得
for my $adapter ($self->adapters->@*) {
my $weather = $adapter->get_weather($city);
if ($weather) {
$self->_set_to_cache($city, $weather);
return { $weather->%*, from_cache => 0 };
}
}
return;
}
# キャッシュ統計
sub cache_stats ($self) {
my $total = $self->_stats->{hits} + $self->_stats->{misses};
my $hit_rate = $total > 0 ? ($self->_stats->{hits} / $total * 100) : 0;
return {
hits => $self->_stats->{hits},
misses => $self->_stats->{misses},
hit_rate => sprintf("%.1f%%", $hit_rate),
size => scalar($self->_cache_order->@*),
};
}
# キャッシュクリア
sub clear_cache ($self) {
$self->_cache->%* = ();
$self->_cache_order->@* = ();
}
}
# メイン処理
package main {
use v5.36;
say "=== 天気予報アグリゲーター（キャッシュ付き） ===";
say "";
my $facade = WeatherFacade->new(
adapters => [
WeatherAdapter::OpenWeatherMap->new,
WeatherAdapter::WeatherStack->new,
],
cache_ttl => 300, # 5分
max_size => 10, # デモ用に小さく
);
# 同じ都市を複数回取得
say "--- 1回目の取得（キャッシュなし） ---";
for my $city (qw(Tokyo Osaka Sapporo)) {
my $weather = $facade->get_weather($city);
if ($weather) {
my $cache_status = $weather->{from_cache} ? "キャッシュから" : "APIから";
say "$city: $weather->{condition}（$cache_status）";
}
}
say "";
say "--- 2回目の取得（キャッシュあり） ---";
for my $city (qw(Tokyo Osaka Sapporo)) {
my $weather = $facade->get_weather($city);
if ($weather) {
my $cache_status = $weather->{from_cache} ? "キャッシュから" : "APIから";
say "$city: $weather->{condition}（$cache_status）";
}
}
say "";
say "--- キャッシュ統計 ---";
my $stats = $facade->cache_stats;
say "ヒット数: $stats->{hits}";
say "ミス数: $stats->{misses}";
say "ヒット率: $stats->{hit_rate}";
say "キャッシュサイズ: $stats->{size}";
}
|
