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| #!/usr/bin/env perl
use v5.36;
use Try::Tiny;
# 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（エラーをシミュレート）
package WeatherAdapter::OpenWeatherMap {
use v5.36;
use Moo;
use Try::Tiny;
has name => (is => 'ro', default => 'OpenWeatherMap');
has fail_cities => (is => 'ro', default => sub { [] });
with 'WeatherAdapter::Role';
sub _get_raw_data ($self, $city) {
# 特定の都市でエラーをシミュレート
if (grep { $_ eq $city } $self->fail_cities->@*) {
die "API connection timeout for $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) {
try {
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 => $self->name,
};
}
catch {
warn "[$self->{name}] $city: $_";
return;
};
}
}
# WeatherStack用Adapter（エラーをシミュレート）
package WeatherAdapter::WeatherStack {
use v5.36;
use Moo;
use Try::Tiny;
has name => (is => 'ro', default => 'WeatherStack');
has fail_cities => (is => 'ro', default => sub { [] });
with 'WeatherAdapter::Role';
sub _get_raw_data ($self, $city) {
# 特定の都市でエラーをシミュレート
if (grep { $_ eq $city } $self->fail_cities->@*) {
die "API rate limit exceeded for $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) {
try {
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 => $self->name,
};
}
catch {
warn "[$self->{name}] $city: $_";
return;
};
}
}
# エラーハンドリング付きFacade
package WeatherFacade {
use v5.36;
use Moo;
has adapters => (is => 'ro', required => 1);
has use_default => (is => 'ro', default => 1); # デフォルト値を使うか
has default_message => (is => 'ro', default => '情報を取得できませんでした');
# デフォルト天気データを生成
sub _default_weather ($self, $city) {
return {
city => $city,
temperature => undef,
humidity => undef,
condition => $self->default_message,
source => 'default',
is_default => 1,
};
}
# 天気情報を取得
sub get_weather ($self, $city) {
for my $adapter ($self->adapters->@*) {
my $weather = $adapter->get_weather($city);
if ($weather) {
return { $weather->%*, is_default => 0 };
}
}
# すべて失敗した場合
if ($self->use_default) {
return $self->_default_weather($city);
}
return;
}
# 複数都市の天気を一括取得
sub get_weather_bulk ($self, @cities) {
my @results;
for my $city (@cities) {
push @results, $self->get_weather($city);
}
return @results;
}
}
# メイン処理
package main {
use v5.36;
say "=== 天気予報アグリゲーター（エラーハンドリング版） ===";
say "";
# 両方のAPIで「Fukuoka」がエラーになるように設定
my $facade = WeatherFacade->new(
adapters => [
WeatherAdapter::OpenWeatherMap->new(fail_cities => ['Fukuoka']),
WeatherAdapter::WeatherStack->new(fail_cities => ['Fukuoka']),
],
use_default => 1,
);
say "--- 天気情報取得 ---";
say "";
my @cities = qw(Tokyo Osaka Sapporo Fukuoka);
for my $city (@cities) {
my $weather = $facade->get_weather($city);
# 常に有効なデータ構造が返る
my $temp = $weather->{temperature} // '---';
my $status = $weather->{is_default} ? '[デフォルト]' : "[via $weather->{source}]";
say "$weather->{city}: $weather->{condition}（気温: $temp℃）$status";
}
say "";
say "--- デフォルト値を使わない場合 ---";
my $facade_strict = WeatherFacade->new(
adapters => [
WeatherAdapter::OpenWeatherMap->new(fail_cities => ['Fukuoka']),
WeatherAdapter::WeatherStack->new(fail_cities => ['Fukuoka']),
],
use_default => 0, # デフォルト値を使わない
);
my $result = $facade_strict->get_weather('Fukuoka');
if ($result) {
say "Fukuoka: $result->{condition}";
}
else {
say "Fukuoka: データ取得に失敗しました（undefが返されました）";
}
}
|
