diff options
Diffstat (limited to 'vendor/github.com/uber/jaeger-client-go/rpcmetrics/endpoints.go')
-rw-r--r-- | vendor/github.com/uber/jaeger-client-go/rpcmetrics/endpoints.go | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/vendor/github.com/uber/jaeger-client-go/rpcmetrics/endpoints.go b/vendor/github.com/uber/jaeger-client-go/rpcmetrics/endpoints.go new file mode 100644 index 000000000..30555243d --- /dev/null +++ b/vendor/github.com/uber/jaeger-client-go/rpcmetrics/endpoints.go @@ -0,0 +1,63 @@ +// Copyright (c) 2017 Uber Technologies, Inc. +// +// 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 rpcmetrics + +import "sync" + +// normalizedEndpoints is a cache for endpointName -> safeName mappings. +type normalizedEndpoints struct { + names map[string]string + maxSize int + defaultName string + normalizer NameNormalizer + mux sync.RWMutex +} + +func newNormalizedEndpoints(maxSize int, normalizer NameNormalizer) *normalizedEndpoints { + return &normalizedEndpoints{ + maxSize: maxSize, + normalizer: normalizer, + names: make(map[string]string, maxSize), + } +} + +// normalize looks up the name in the cache, if not found it uses normalizer +// to convert the name to a safe name. If called with more than maxSize unique +// names it returns "" for all other names beyond those already cached. +func (n *normalizedEndpoints) normalize(name string) string { + n.mux.RLock() + norm, ok := n.names[name] + l := len(n.names) + n.mux.RUnlock() + if ok { + return norm + } + if l >= n.maxSize { + return "" + } + return n.normalizeWithLock(name) +} + +func (n *normalizedEndpoints) normalizeWithLock(name string) string { + norm := n.normalizer.Normalize(name) + n.mux.Lock() + defer n.mux.Unlock() + // cache may have grown while we were not holding the lock + if len(n.names) >= n.maxSize { + return "" + } + n.names[name] = norm + return norm +} |