「コンテキストマネージャ」とは、`with`文の中で使用できるPythonオブジェクトのことです。

例えば、[ファイルを読み込むには`with`を使用することができます](https://docs.python.org/3/tutorial/inputoutput.html#reading-and-writing-files):

```Python
with open("./somefile.txt") as f:
    contents = f.read()
    print(contents)
```

その後の`open("./somefile.txt")`は「コンテキストマネージャ」と呼ばれるオブジェクトを作成します。

`with`ブロックが終了すると、例外があったとしてもファイルを確かに閉じます。

`yield`を持つ依存関係を作成すると、**FastAPI** は内部的にそれをコンテキストマネージャに変換し、他の関連ツールと組み合わせます。

	case writeMode:
		defer updateOSMetrics(osMetricOpenFileWFd, name)(err)
	default:
		defer updateOSMetrics(osMetricOpenFileRFd, name)(err)
	}
	var e error
	fd, e = syscall.Open(name, flag|syscall.O_CLOEXEC, uint32(perm))
	if e != nil {
		return -1, &os.PathError{Op: "open", Path: name, Err: e}
	}
	return fd, nil
}

// Forked from Golang but chooses to avoid performing lookup
//
// osMkdirAll creates a directory named path,

	}

	// create a new connection to keep away from other tests
	tx, err := OpenTestConnection(&gorm.Config{PrepareStmt: true})
	if err != nil {
		t.Fatalf("failed to open test connection due to %s", err)
	}
	pdb, ok := tx.ConnPool.(*gorm.PreparedStmtDB)
	if !ok {
		t.Fatalf("should assign PreparedStatement Manager back to database when using PrepareStmt mode")
	}

/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,

        // Act
        int available = stream.available();

        // Assert
        assertEquals(7, available, "Should return available bytes reported by server");

        // Interactions: ensure open, use tree, send IOCTL and close resources
        InOrder inOrder = inOrder(handle, fd, tree);
        inOrder.verify(handle, times(1)).ensureOpen();
        inOrder.verify(fd, times(1)).getTree();

          defaults(JUnit) {
            vmParameters = [
              '-ea',
              '-Djava.locale.providers=SPI,COMPAT',
              "--illegal-access=deny",
              // TODO: only open these for mockito when it is modularized
              '--add-opens=java.base/java.security.cert=ALL-UNNAMED',
              '--add-opens=java.base/java.nio.channels=ALL-UNNAMED',

 * are "allowed". If all of the desired access bits are not "allowed"
 * the then same process is repeated for inherited ACEs.
 * <p>
 * For example, if user <code>WNET\alice</code> tries to open a file
 * with desired access bits <code>0x00000003</code> (<code>FILE_READ_DATA |
 * FILE_WRITE_DATA</code>) and the target file has the following security
 * descriptor ACEs:
 *
 * <pre>

Building Elasticsearch with Gradle
=============================

Elasticsearch is built using the [Gradle](https://gradle.org/) open source build tools.

This document provides a general guidelines for using and working on the elasticsearch build logic.

## Build logic organisation

    if (cmp < 0) {
      return aggregateBelowRange(aggr, node.left);
    } else if (cmp == 0) {
      switch (range.getLowerBoundType()) {
        case OPEN:
          return aggr.nodeAggregate(node) + aggr.treeAggregate(node.left);
        case CLOSED:
          return aggr.treeAggregate(node.left);
      }
      throw new AssertionError();
    } else {

        }
    }

    /**
     * Report a potential resource leak
     */
    private void reportPotentialLeak(ResourceHolder holder) {
        log.warn("Potential resource leak detected: {} ({}) - open for {} ms", holder.resourceId, holder.resourceType, holder.getAge());

        if (log.isDebugEnabled() && holder.allocationStackTrace != null) {
            StringBuilder sb = new StringBuilder("Allocation stack trace:\n");