feat: Add .env.example configuration file and integrate Redis service into Docker Compose for improved task management. Update desktop application to support document indexing and extraction workflows, enhancing user experience with a new extraction wizard and stepper components. Revise README and documentation for clarity on setup and usage.

services/services-count-facturas-medicas-serving/internal/ocr/pool.go

@@ -0,0 +1,69 @@
+package ocr
+
+import (
+	"fmt"
+
+	"github.com/otiai10/gosseract/v2"
+)
+
+// Engine holds a pool of reusable Tesseract clients.
+type Engine struct {
+	pool    chan *gosseract.Client
+	clients []*gosseract.Client
+	lang    string
+}
+
+// NewEngine warms up poolSize Tesseract clients for the given language.
+func NewEngine(lang string, poolSize int) (*Engine, error) {
+	if poolSize < 1 {
+		poolSize = 1
+	}
+
+	e := &Engine{
+		pool:    make(chan *gosseract.Client, poolSize),
+		clients: make([]*gosseract.Client, 0, poolSize),
+		lang:    lang,
+	}
+
+	for i := 0; i < poolSize; i++ {
+		client, err := newPooledClient(lang)
+		if err != nil {
+			e.Close()
+			return nil, fmt.Errorf("tesseract client %d: %w", i, err)
+		}
+		e.clients = append(e.clients, client)
+		e.pool <- client
+	}
+
+	return e, nil
+}
+
+func newPooledClient(lang string) (*gosseract.Client, error) {
+	client := gosseract.NewClient()
+	if err := client.SetLanguage(lang); err != nil {
+		if err2 := client.SetLanguage("eng"); err2 != nil {
+			_ = client.Close()
+			return nil, fmt.Errorf("tesseract lang: %w", err)
+		}
+	}
+	return client, nil
+}
+
+// Acquire returns a Tesseract client from the pool.
+func (e *Engine) Acquire() *gosseract.Client {
+	return <-e.pool
+}
+
+// Release returns a client to the pool.
+func (e *Engine) Release(client *gosseract.Client) {
+	e.pool <- client
+}
+
+// Close shuts down all pooled clients.
+func (e *Engine) Close() error {
+	for _, client := range e.clients {
+		_ = client.Close()
+	}
+	e.clients = nil
+	return nil
+}