Breakup the registry package into separate packages.

Currently all registry implementations live in a single package,
which makes it bit harder to maintain. The different registry
implementations do not follow the same coding style and naming
conventions, which makes the code harder to read.

Breakup the registry package into smaller packages based on
the registry implementation. Refactor the registry packages
to follow a similar coding style and naming convention.

This patch does not introduce any changes in behavior.

pkg/registry/binding/storage.go

@@ -0,0 +1,75 @@
+/*
+Copyright 2014 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 binding
+
+import (
+	"fmt"
+
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/apiserver"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/registry/pod"
+)
+
+// BindingStorage implements the RESTStorage interface. When bindings are written, it
+// changes the location of the affected pods. This information is eventually reflected
+// in the pod's CurrentState.Host field.
+type BindingStorage struct {
+	podRegistry pod.Registry
+}
+
+// MakeBindingStorage makes a new BindingStorage backed by the given PodRegistry.
+func MakeBindingStorage(podRegistry pod.Registry) *BindingStorage {
+	return &BindingStorage{
+		podRegistry: podRegistry,
+	}
+}
+
+// List returns an error because bindings are write-only objects.
+func (*BindingStorage) List(selector labels.Selector) (interface{}, error) {
+	return nil, apiserver.NewNotFoundErr("binding", "list")
+}
+
+// Get returns an error because bindings are write-only objects.
+func (*BindingStorage) Get(id string) (interface{}, error) {
+	return nil, apiserver.NewNotFoundErr("binding", id)
+}
+
+// Delete returns an error because bindings are write-only objects.
+func (*BindingStorage) Delete(id string) (<-chan interface{}, error) {
+	return nil, apiserver.NewNotFoundErr("binding", id)
+}
+
+// New returns a new binding object fit for having data unmarshalled into it.
+func (*BindingStorage) New() interface{} {
+	return &api.Binding{}
+}
+
+// Create attempts to make the assignment indicated by the binding it recieves.
+func (b *BindingStorage) Create(obj interface{}) (<-chan interface{}, error) {
+	binding, ok := obj.(*api.Binding)
+	if !ok {
+		return nil, fmt.Errorf("incorrect type: %#v", obj)
+	}
+	_ = binding
+	return nil, fmt.Errorf("Implementation coming in the future. Storage layer can't easily support this yet.")
+}
+
+// Update returns an error-- this object may not be updated.
+func (b *BindingStorage) Update(obj interface{}) (<-chan interface{}, error) {
+	return nil, fmt.Errorf("Bindings may not be changed.")
+}

pkg/registry/binding/storage_test.go

@@ -0,0 +1,45 @@
+/*
+Copyright 2014 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 binding
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
+)
+
+func TestBindingStorage_Extract(t *testing.T) {
+	b := &BindingStorage{}
+
+	binding := &api.Binding{
+		PodID: "foo",
+		Host:  "bar",
+	}
+	body, err := api.Encode(binding)
+	if err != nil {
+		t.Fatalf("Unexpected encode error %v", err)
+	}
+	obj := b.New()
+	err = api.DecodeInto(body, obj)
+	if err != nil {
+		t.Fatalf("Unexpected error %v", err)
+	}
+	if e, a := binding, obj; !reflect.DeepEqual(e, a) {
+		t.Errorf("Expected %#v, but got %#v", e, a)
+	}
+}