### 背景任務與含有 `yield` 的相依，技術細節 { #background-tasks-and-dependencies-with-yield-technical-details }

在 FastAPI 0.106.0 之前，不可能在 `yield` 之後拋出例外；含有 `yield` 的相依的結束程式碼會在回應送出之後才執行，因此[例外處理器](../tutorial/handling-errors.md#install-custom-exception-handlers) 早就已經跑完了。

當初這樣設計主要是為了允許在背景任務中使用由相依「yield」出來的同一組物件，因為結束程式碼會在背景任務結束後才執行。

在 FastAPI 0.106.0 中，這個行為被修改，目的是在等待回應穿越網路的期間，不要持有資源。

/// tip | 提示

    
    // Cache should be invalidated, new listing should include new file
    SmbFile[] updatedFiles = dir.listFiles();
    assertEquals(initialFiles.length + 1, updatedFiles.length);
}
```

## 9. Error Handling

### 9.1 Cache Consistency
```java
public class CacheConsistencyManager {
    public void handleInconsistency(String directoryPath, String fileName) {

        if (total == 0) return 0.0;
        return (double) operationErrors.get() / total;
    }
    
    // Getters for all statistics...
}
```

## 9. Error Handling and Fallback

### 9.1 RDMA Error Recovery
```java
public class RdmaErrorHandler {
    public void handleRdmaError(RdmaConnection connection, Exception error) {

                resource.setReadWrite();
                resource.setAttributes(0x20);
            }, "Should support attribute operations");
        }
    }

    @Nested
    @DisplayName("Error Handling Tests")
    class ErrorHandlingTests {

        @Test
        @DisplayName("CIFSException should be properly declared")
        void testCIFSExceptionDeclaration() throws NoSuchMethodException {

### バックグラウンドタスクと `yield` を伴う依存関係、技術詳細 { #background-tasks-and-dependencies-with-yield-technical-details }

FastAPI 0.106.0 より前では、`yield` の後で例外を送出することはできませんでした。`yield` を持つ依存関係の終了コードはレスポンス送信「後」に実行されるため、[例外ハンドラ](../tutorial/handling-errors.md#install-custom-exception-handlers)はすでに実行済みでした。

これは主に、依存関係が "yield" した同じオブジェクトをバックグラウンドタスク内で利用できるようにするための設計でした。終了コードはバックグラウンドタスク完了後に実行されるからです。

        assertTrue(testClient.calledMethods.contains("createAlias"));
    }

    // ==========================================================================
    // reindexConfigIndices - error handling
    // ==========================================================================

    @Test
    public void test_reindexConfigIndices_backupCreationFailureContinues() {
        testClient.existsIndexResult = true;

import java.util.HashMap;
import java.util.Map;

import org.codelibs.fess.suggest.constants.FieldNames;
import org.junit.Test;

/**
 * Boundary tests for SuggestItem.
 * Tests edge cases, null handling, and limit conditions.
 */
public class SuggestItemBoundaryTest {

    // ============================================================
    // Tests for empty/boundary text arrays

	// If the adb subprocess somehow hangs, go test will kill this wrapper
	// and wait for our os.Stderr (and os.Stdout) to close as a result.
	// However, if the os.Stderr (or os.Stdout) file descriptors are
	// passed on, the hanging adb subprocess will hold them open and
	// go test will hang forever.
	//
	// Avoid that by wrapping stderr, breaking the short circuit and
	// forcing cmd.Run to use another pipe and goroutine to pass

 * This class extends XpathTransformer to provide Fess-specific document processing capabilities
 * including content extraction, metadata processing, and robots tag handling.
 */
public class FessXpathTransformer extends XpathTransformer implements FessTransformer {

    /** Logger instance for this class */

   *
   * @since 32.0.0
   */
  public static final String OBSERVE_BROWSING_TOPICS = "Observe-Browsing-Topics";

  /**
   * The HTTP <a
   * href="https://wicg.github.io/turtledove/#handling-direct-from-seller-signals">{@code
   * Sec-Ad-Auction-Fetch}</a> header field name.
   *
   * @since 33.0.0
   */
  public static final String SEC_AD_AUCTION_FETCH = "Sec-Ad-Auction-Fetch";

  /**