65aaa607ab
Change made by: - running "gvt fetch" on each of the packages mentioned in Godeps/Godeps.json - `rm -rf Godeps` - tweaking the build scripts to not mention Godeps - tweaking the build scripts to test `./lib/...`, `./cmd/...` explicitly (to avoid testing vendor) - tweaking the build scripts to not juggle GOPATH for Godeps and instead set GO15VENDOREXPERIMENT. This also results in some updated packages at the same time I bet. Building with Go 1.3 and 1.4 still *works* but won't use our vendored dependencies - the user needs to have the actual packages in their GOPATH then, which they'll get with a normal "go get". Building with Go 1.6+ will get our vendored dependencies by default even when not using our build script, which is nice. By doing this we gain some freedom in that we can pick and choose manually what to include in vendor, as it's not based on just dependency analysis of our own code. This is also a risk as we might pick up dependencies we are unaware of, as the build may work locally with those packages present in GOPATH. On the other hand the build server will detect this as it has no packages in it's GOPATH beyond what is included in the repo. Recommended tool to manage dependencies is github.com/FiloSottile/gvt.
113 lines
2.5 KiB
Go
113 lines
2.5 KiB
Go
package metrics
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import "sync/atomic"
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// Counters hold an int64 value that can be incremented and decremented.
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type Counter interface {
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Clear()
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Count() int64
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Dec(int64)
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Inc(int64)
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Snapshot() Counter
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}
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// GetOrRegisterCounter returns an existing Counter or constructs and registers
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// a new StandardCounter.
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func GetOrRegisterCounter(name string, r Registry) Counter {
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if nil == r {
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r = DefaultRegistry
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}
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return r.GetOrRegister(name, NewCounter).(Counter)
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}
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// NewCounter constructs a new StandardCounter.
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func NewCounter() Counter {
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if UseNilMetrics {
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return NilCounter{}
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}
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return &StandardCounter{0}
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}
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// NewRegisteredCounter constructs and registers a new StandardCounter.
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func NewRegisteredCounter(name string, r Registry) Counter {
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c := NewCounter()
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if nil == r {
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r = DefaultRegistry
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}
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r.Register(name, c)
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return c
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}
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// CounterSnapshot is a read-only copy of another Counter.
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type CounterSnapshot int64
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// Clear panics.
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func (CounterSnapshot) Clear() {
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panic("Clear called on a CounterSnapshot")
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}
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// Count returns the count at the time the snapshot was taken.
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func (c CounterSnapshot) Count() int64 { return int64(c) }
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// Dec panics.
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func (CounterSnapshot) Dec(int64) {
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panic("Dec called on a CounterSnapshot")
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}
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// Inc panics.
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func (CounterSnapshot) Inc(int64) {
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panic("Inc called on a CounterSnapshot")
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}
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// Snapshot returns the snapshot.
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func (c CounterSnapshot) Snapshot() Counter { return c }
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// NilCounter is a no-op Counter.
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type NilCounter struct{}
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// Clear is a no-op.
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func (NilCounter) Clear() {}
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// Count is a no-op.
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func (NilCounter) Count() int64 { return 0 }
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// Dec is a no-op.
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func (NilCounter) Dec(i int64) {}
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// Inc is a no-op.
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func (NilCounter) Inc(i int64) {}
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// Snapshot is a no-op.
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func (NilCounter) Snapshot() Counter { return NilCounter{} }
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// StandardCounter is the standard implementation of a Counter and uses the
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// sync/atomic package to manage a single int64 value.
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type StandardCounter struct {
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count int64
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}
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// Clear sets the counter to zero.
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func (c *StandardCounter) Clear() {
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atomic.StoreInt64(&c.count, 0)
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}
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// Count returns the current count.
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func (c *StandardCounter) Count() int64 {
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return atomic.LoadInt64(&c.count)
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}
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// Dec decrements the counter by the given amount.
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func (c *StandardCounter) Dec(i int64) {
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atomic.AddInt64(&c.count, -i)
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}
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// Inc increments the counter by the given amount.
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func (c *StandardCounter) Inc(i int64) {
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atomic.AddInt64(&c.count, i)
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}
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// Snapshot returns a read-only copy of the counter.
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func (c *StandardCounter) Snapshot() Counter {
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return CounterSnapshot(c.Count())
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}
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