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vendor/google.golang.org/api/internal/pool.go

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+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// 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,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package internal
+
+import (
+	"errors"
+	"google.golang.org/grpc/naming"
+)
+
+// PoolResolver provides a fixed list of addresses to load balance between
+// and does not provide further updates.
+type PoolResolver struct {
+	poolSize int
+	dialOpt  *DialSettings
+	ch       chan []*naming.Update
+}
+
+// NewPoolResolver returns a PoolResolver
+// This is an EXPERIMENTAL API and may be changed or removed in the future.
+func NewPoolResolver(size int, o *DialSettings) *PoolResolver {
+	return &PoolResolver{poolSize: size, dialOpt: o}
+}
+
+// Resolve returns a Watcher for the endpoint defined by the DialSettings
+// provided to NewPoolResolver.
+func (r *PoolResolver) Resolve(target string) (naming.Watcher, error) {
+	if r.dialOpt.Endpoint == "" {
+		return nil, errors.New("No endpoint configured")
+	}
+	addrs := make([]*naming.Update, 0, r.poolSize)
+	for i := 0; i < r.poolSize; i++ {
+		addrs = append(addrs, &naming.Update{Op: naming.Add, Addr: r.dialOpt.Endpoint, Metadata: i})
+	}
+	r.ch = make(chan []*naming.Update, 1)
+	r.ch <- addrs
+	return r, nil
+}
+
+// Next returns a static list of updates on the first call,
+// and blocks indefinitely until Close is called on subsequent calls.
+func (r *PoolResolver) Next() ([]*naming.Update, error) {
+	return <-r.ch, nil
+}
+
+func (r *PoolResolver) Close() {
+	close(r.ch)
+}