aboutsummaryrefslogtreecommitdiffstats
path: root/vendor/google.golang.org/api/internal/pool.go
diff options
context:
space:
mode:
Diffstat (limited to 'vendor/google.golang.org/api/internal/pool.go')
-rw-r--r--vendor/google.golang.org/api/internal/pool.go61
1 files changed, 61 insertions, 0 deletions
diff --git a/vendor/google.golang.org/api/internal/pool.go b/vendor/google.golang.org/api/internal/pool.go
new file mode 100644
index 000000000..ba406247f
--- /dev/null
+++ b/vendor/google.golang.org/api/internal/pool.go
@@ -0,0 +1,61 @@
+// Copyright 2016 Google LLC
+//
+// 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
+}
+
+// Close releases resources associated with the pool and causes Next to unblock.
+func (r *PoolResolver) Close() {
+ close(r.ch)
+}