ServiceWorker: Migrate the script cache backend from BlockFile to Simple

content/browser/service_worker/service_worker_disk_cache_migrator.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/service_worker/service_worker_disk_cache_migrator.h"
 
 #include "base/memory/ref_counted.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/time/time.h"
 #include "content/common/service_worker/service_worker_types.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 #include "net/disk_cache/disk_cache.h"
 
 namespace content {
 
+namespace {
+
+void RecordMigrationResult(ServiceWorkerStatusCode status) {
+  UMA_HISTOGRAM_ENUMERATION("ServiceWorker.DiskCacheMigrator.MigrationResult",
+                            status, SERVICE_WORKER_ERROR_MAX_VALUE);
+}
+
+void RecordNumberOfMigratedResources(size_t migrated_resources) {
+  UMA_HISTOGRAM_CUSTOM_COUNTS(
+      "ServiceWorker.DiskCacheMigrator.NumberOfMigratedResources",
+      migrated_resources, 1, 1000, 50);
+}
+
+void RecordMigrationTime(const base::TimeDelta& time) {
+  UMA_HISTOGRAM_MEDIUM_TIMES("ServiceWorker.DiskCacheMigrator.MigrationTime",
+                             time);
+}
+
+}  // namespace
+
 // A task to move a cached resource from the src DiskCache to the dest
 // DiskCache. This is owned by ServiceWorkerDiskCacheMigrator.
 class ServiceWorkerDiskCacheMigrator::Task {
  public:
   Task(InflightTaskMap::KeyType task_id,
        int64 resource_id,
        disk_cache::ScopedEntryPtr entry,
        ServiceWorkerDiskCache* src,
        ServiceWorkerDiskCache* dest,
        const base::WeakPtr<ServiceWorkerDiskCacheMigrator>& owner);
@@ skipping 196 matching lines @@
   DCHECK(!src_->is_disabled());
   DCHECK(!dest_->is_disabled());
 }
 
 ServiceWorkerDiskCacheMigrator::~ServiceWorkerDiskCacheMigrator() {
 }
 
 void ServiceWorkerDiskCacheMigrator::Start(const StatusCallback& callback) {
   callback_ = callback;
   iterator_ = src_->disk_cache()->CreateIterator();
+  start_time_ = base::TimeTicks::Now();
   ContinueMigratingResources();
 }
 
 void ServiceWorkerDiskCacheMigrator::ContinueMigratingResources() {
   scoped_ptr<WrappedEntry> wrapped_entry(new WrappedEntry);
   disk_cache::Entry** entry_ptr = wrapped_entry->GetPtr();
 
   net::CompletionCallback callback = base::Bind(
       &ServiceWorkerDiskCacheMigrator::OnOpenNextEntry,
       weak_factory_.GetWeakPtr(), base::Passed(wrapped_entry.Pass()));
@@ skipping 56 matching lines @@
     ServiceWorkerStatusCode status) {
   DCHECK(inflight_tasks_.Lookup(task_id));
   inflight_tasks_.Remove(task_id);
 
   if (status != SERVICE_WORKER_OK) {
     inflight_tasks_.Clear();
     Complete(status);
     return;
   }
 
+  ++number_of_migrated_resources_;
+
   if (pending_task_) {
     RunPendingTask();
     ContinueMigratingResources();
     return;
   }
 
   if (inflight_tasks_.IsEmpty()) {
     Complete(SERVICE_WORKER_OK);
     return;
   }
 }
 
 void ServiceWorkerDiskCacheMigrator::Complete(ServiceWorkerStatusCode status) {
   DCHECK(inflight_tasks_.IsEmpty());
-  // TODO(nhiroki): Add UMA for the result of migration.
+  if (status == SERVICE_WORKER_OK) {
+    RecordMigrationTime(base::TimeTicks().Now() - start_time_);
+    RecordNumberOfMigratedResources(number_of_migrated_resources_);
+  }
+  RecordMigrationResult(status);
   callback_.Run(status);
 }
 
 }  // namespace content