Merge remote-tracking branch 'aosp/upstream-master' into merge am: dd3cabeacc

am: 6fbc3cf5a1

Change-Id: I11b0ec1cf561d2a14da78e444b1594f167787fe6

1 files changed, 34 insertions, 0 deletions

diff --git a/impl_core/src/main/java/io/opencensus/implcore/metrics/Meter.java b/impl_core/src/main/java/io/opencensus/implcore/metrics/Meter.java
new file mode 100644
index 00000000..f5a8dc8f
--- /dev/null
+++ b/impl_core/src/main/java/io/opencensus/implcore/metrics/Meter.java
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2018, OpenCensus Authors
+ *
+ * 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 io.opencensus.implcore.metrics;
+
+import io.opencensus.common.Clock;
+import io.opencensus.metrics.export.Metric;
+import javax.annotation.Nullable;
+
+interface Meter {
+  /**
+   * Provides a {@link io.opencensus.metrics.export.Metric} with one or more {@link
+   * io.opencensus.metrics.export.TimeSeries}.
+   *
+   * @param clock the clock used to get the time.
+   * @throws NullPointerException if {@code TimeSeries} is not present in {@code Metric}.
+   * @return a {@code Metric}.
+   */
+  @Nullable
+  Metric getMetric(Clock clock);
+}