refactor: transport agnostic examples (#131)

examples/custom-dependencies/Service/InMemoryTaskRepository.php

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+<?php
+
+/*
+ * This file is part of the official PHP MCP SDK.
+ *
+ * A collaboration between Symfony and the PHP Foundation.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Mcp\Example\CustomDependencies\Service;
+
+use Psr\Log\LoggerInterface;
+
+/**
+ * @phpstan-import-type Task from TaskRepositoryInterface
+ */
+final class InMemoryTaskRepository implements TaskRepositoryInterface
+{
+    /**
+     * @var array<int, Task>
+     */
+    private array $tasks = [];
+    private int $nextTaskId = 1;
+
+    public function __construct(
+        private readonly LoggerInterface $logger,
+    ) {
+        // Add some initial tasks
+        $this->addTask('user1', 'Buy groceries');
+        $this->addTask('user1', 'Write MCP example');
+        $this->addTask('user2', 'Review PR');
+    }
+
+    public function addTask(string $userId, string $description): array
+    {
+        $task = [
+            'id' => $this->nextTaskId++,
+            'userId' => $userId,
+            'description' => $description,
+            'completed' => false,
+            'createdAt' => date('c'),
+        ];
+        $this->tasks[$task['id']] = $task;
+        $this->logger->info('Task added', ['id' => $task['id'], 'user' => $userId]);
+
+        return $task;
+    }
+
+    public function getTasksForUser(string $userId): array
+    {
+        return array_values(array_filter($this->tasks, fn ($task) => $task['userId'] === $userId && !$task['completed']));
+    }
+
+    public function getAllTasks(): array
+    {
+        return array_values($this->tasks);
+    }
+
+    public function completeTask(int $taskId): bool
+    {
+        if (isset($this->tasks[$taskId])) {
+            $this->tasks[$taskId]['completed'] = true;
+            $this->logger->info('Task completed', ['id' => $taskId]);
+
+            return true;
+        }
+
+        return false;
+    }
+}

examples/custom-dependencies/Service/StatsServiceInterface.php

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+<?php
+
+/*
+ * This file is part of the official PHP MCP SDK.
+ *
+ * A collaboration between Symfony and the PHP Foundation.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Mcp\Example\CustomDependencies\Service;
+
+interface StatsServiceInterface
+{
+    /**
+     * @return array<string, int>
+     */
+    public function getSystemStats(): array;
+}

examples/custom-dependencies/Service/SystemStatsService.php

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+<?php
+
+/*
+ * This file is part of the official PHP MCP SDK.
+ *
+ * A collaboration between Symfony and the PHP Foundation.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Mcp\Example\CustomDependencies\Service;
+
+final class SystemStatsService implements StatsServiceInterface
+{
+    public function __construct(
+        private readonly TaskRepositoryInterface $taskRepository,
+    ) {
+    }
+
+    public function getSystemStats(): array
+    {
+        $allTasks = $this->taskRepository->getAllTasks();
+        $completed = \count(array_filter($allTasks, fn ($task) => $task['completed']));
+        $pending = \count($allTasks) - $completed;
+
+        return [
+            'total_tasks' => \count($allTasks),
+            'completed_tasks' => $completed,
+            'pending_tasks' => $pending,
+            'server_uptime_seconds' => time() - $_SERVER['REQUEST_TIME_FLOAT'], // Approx uptime for CLI script
+        ];
+    }
+}

examples/custom-dependencies/Service/TaskRepositoryInterface.php

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+<?php
+
+/*
+ * This file is part of the official PHP MCP SDK.
+ *
+ * A collaboration between Symfony and the PHP Foundation.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Mcp\Example\CustomDependencies\Service;
+
+/**
+ * @phpstan-type Task array{id: int, userId: string, description: string, completed: bool, createdAt: string}
+ */
+interface TaskRepositoryInterface
+{
+    /**
+     * @return Task
+     */
+    public function addTask(string $userId, string $description): array;
+
+    /**
+     * @return Task[]
+     */
+    public function getTasksForUser(string $userId): array;
+
+    /**
+     * @return Task[]
+     */
+    public function getAllTasks(): array;
+
+    public function completeTask(int $taskId): bool;
+}