</p>

<h2 id="synchronization">Synchronization</h2>

<h3 id="init">Initialization</h3>

<p>
Program initialization runs in a single goroutine,
but that goroutine may create other goroutines,
which run concurrently.
</p>

<p class="rule">
If a package <code>p</code> imports package <code>q</code>, the completion of
<code>q</code>'s <code>init</code> functions happens before the start of any of <code>p</code>'s.
</p>

 * }</pre>
 *
 * <h3>Comparison to alternatives</h3>
 *
 * <p><b>Note:</b> In some cases the differences explained below can be subtle. When it's unclear
 * which approach to use, <b>don't worry</b> too much about it; just pick something that seems
 * reasonable and it will be fine.
 *
 * <ul>
 *   <li>If checking whether the <i>caller</i> has violated your method or constructor's contract

 * href="https://github.com/google/guava/wiki/GraphsExplained#definitions">definitions of
 * terms</a>):
 *
 * <ul>
 *   <li>directed graphs
 *   <li>undirected graphs
 *   <li>graphs that do/don't allow self-loops
 *   <li>graphs whose nodes/edges are insertion-ordered, sorted, or unordered
 *   <li>graphs whose edges have associated values
 * </ul>
 *

// which will eventually replace the current target.
func (h *Target) AssignMigrateTarget(migrateTgt *Target) {
	h.migrateTarget = migrateTgt
}

// Init validate and initialize the http target
func (h *Target) Init(ctx context.Context) (err error) {
	if h.config.QueueDir != "" {
		return h.initQueueOnce.DoWithContext(ctx, h.initDiskStore)
	}
	return h.initQueueOnce.DoWithContext(ctx, h.initMemoryStore)

// It may return the (non-nil) error from the same call or return the error (and n == 0) from a subsequent call.
// Callers should always process the n > 0 bytes returned before considering the error err.
// Doing so correctly handles I/O errors that happen after reading some bytes and also both of the allowed EOF behaviors.
func (r *RingBuffer) Read(p []byte) (n int, err error) {
	if len(p) == 0 {
		return 0, r.readErr(false)
	}

ons=c.icons,this.maxHours=c.maxHours,this.explicitMode=c.explicitMode,this.handleDocumentClick=function(a){var b=a.data.scope;b.$element.parent().find(a.target).length||b.$widget.is(a.target)||b.$widget.find(a.target).length||b.hideWidget()},this._init()};d.prototype={constructor:d,_init:function(){var b=this;this.showWidgetOnAddonClick&&this.$element.parent().hasClass("input-group")&&this.$element.parent().hasClass("bootstrap-timepicker")?(this.$element.parent(".input-group.bootstrap-timepicker...

### Federation
* The --dns-provider argument of 'kubefed init' is now mandatory and does not default to `google-clouddns`. To initialize a Federation control plane with Google Cloud DNS, use the following invocation: 'kubefed init --dns-provider=google-clouddns' ([#42092](https://github.com/kubernetes/kubernetes/pull/42092), [@marun](https://github.com/marun))

		}
		return true
	}

	for i, test := range removeSensitiveHeadersTests {
		metadata := make(map[string]string, len(test.Header))
		for k := range test.Header {
			metadata[k] = "" // set metadata key - we don't care about the value
		}

		RemoveSensitiveHeaders(test.Header)
		if !isEqual(test.ExpectedHeader, test.Header) {

		// like an IP address.
		isNotNumber := false
		for i := 0; i < len(piece); i++ {
			switch {
			case (piece[i] >= 'a' && piece[i] <= 'z' ||
				piece[i] == '-'):
				// Found a non-digit character, so
				// this piece is not a number.
				isNotNumber = true
			case piece[i] >= '0' && piece[i] <= '9':
				// Nothing to do.
			default:
				// Found invalid character.
				return false
			}

                    /*
                     * TODO Extensions like Flex Mojos use custom scopes like "merged", "internal", "external", etc. In
                     * order to don't break backward-compat with those, only warn but don't error out.
                     */
                    validateEnum(
                            prefix,
                            "scope",
                            problems,