if (files != null) {
        for (File f : files) {
          if (!delete(f)) {
            return false;
          }
        }
      }
    }

    if (!file.delete()) {
      logger.log(Level.WARNING, "couldn't delete file: {0}", new Object[] {file});
      return false;
    }

    return true;
  }

			b.Fatal(err)
		}
	}
}

func TestEncodeDecodehealingTracker(t *testing.T) {
	v := healingTracker{}
	var buf bytes.Buffer
	msgp.Encode(&buf, &v)

	m := v.Msgsize()
	if buf.Len() > m {
		t.Log("WARNING: TestEncodeDecodehealingTracker Msgsize() is inaccurate")
	}

	vn := healingTracker{}
	err := msgp.Decode(&buf, &vn)
	if err != nil {
		t.Error(err)
	}

	buf.Reset()
	msgp.Encode(&buf, &v)

         *
         * @param source    the source value
         * @param fieldName a description of the field being interpolated. The implementation may use this to
         *                  log stuff
         * @return the interpolated value
         */
        String transform(String source, String fieldName);
    }

只有所有 `startup` 事件处理器运行完毕，**FastAPI** 应用才开始接收请求。

## `shutdown` 事件

使用 `shutdown` 事件声明 `app` 关闭时运行的函数：

```Python hl_lines="6"
{!../../docs_src/events/tutorial002.py!}
```

此处，`shutdown` 事件处理器函数在 `log.txt` 中写入一行文本 `Application shutdown`。

/// info | "说明"

`open()` 函数中，`mode="a"` 指的是**追加**。因此这行文本会添加在文件已有内容之后，不会覆盖之前的内容。

///

/// tip | "提示"

注意，本例使用 Python `open()` 标准函数与文件交互。

	"istio.io/istio/istioctl/pkg/ztunnelconfig"
	"istio.io/istio/operator/cmd/mesh"
	"istio.io/istio/pkg/cmd"
	"istio.io/istio/pkg/collateral"
	"istio.io/istio/pkg/config/constants"
	"istio.io/istio/pkg/log"
	"istio.io/istio/tools/bug-report/pkg/bugreport"
)

const (
	// Location to read istioctl defaults from
	defaultIstioctlConfig = "$HOME/.istioctl/config.yaml"
)

const (
	FlagCharts = "charts"
)

	locked = lrwm.GetLock(ctx, "", "", duration)
	if locked {
		// fmt.Println("Write lock acquired, waiting...")
		time.Sleep(1 * time.Second)

		lrwm.Unlock()
	} else {
		t.Log("Write lock failed due to timeout")
	}
	return
}

func TestSimpleWriteLockAcquired(t *testing.T) {
	locked := testSimpleWriteLock(t, 5*time.Second)

	expected := true
	if locked != expected {

Server: nginx/1.4.6 (Ubuntu)
Content-Type: text/plain
Content-Length: 1759
Connection: keep-alive
```

We can see that we were redirected because `response.request().url()` is different from `request.url()`. The two log statements log two different URLs.

### Network Interceptors

Registering a network interceptor is quite similar. Call `addNetworkInterceptor()` instead of `addInterceptor()`:

```java

<div class="wrapper">
    <jsp:include page="/WEB-INF/view/common/admin/header.jsp"></jsp:include>
    <jsp:include page="/WEB-INF/view/common/admin/sidebar.jsp">
        <jsp:param name="menuCategoryType" value="log"/>
        <jsp:param name="menuType" value="backup"/>
    </jsp:include>
    <div class="content-wrapper">
        <div class="content-header">
            <div class="container-fluid">

        } else {
            buf.append(ComponentUtil.getSystemHelper().getLogFilePath());
        }
        buf.append(File.separator);
        buf.append("gc-").append(getExecuteType()).append(".log");
        buf.append(":utctime,pid,tags:filecount=5,filesize=64m");
        return jvmOptions(buf.toString());
    }

    public ExecJob jvmOptions(final String... options) {

- **Focus**:
  1. Collection and processing of telemetry data.
  1. Interaction between telemetry components and Istio control plane.
  1. Validation of metrics collection and reporting.
  1. Testing of logging configurations and log collection.
  1. Validation of tracing and distributed tracing setups.
- **Setup**: The main test setup in this folder initializes the Istio control plane with telemetry configurations.

### Helm Integration Tests