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-rw-r--r--api/src/main/java/io/opencensus/stats/StatsComponent.java74
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diff --git a/api/src/main/java/io/opencensus/stats/StatsComponent.java b/api/src/main/java/io/opencensus/stats/StatsComponent.java
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+/*
+ * Copyright 2017, 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.stats;
+
+/**
+ * Class that holds the implementations for {@link ViewManager} and {@link StatsRecorder}.
+ *
+ * <p>All objects returned by methods on {@code StatsComponent} are cacheable.
+ *
+ * @since 0.8
+ */
+public abstract class StatsComponent {
+
+ /**
+ * Returns the default {@link ViewManager}.
+ *
+ * @since 0.8
+ */
+ public abstract ViewManager getViewManager();
+
+ /**
+ * Returns the default {@link StatsRecorder}.
+ *
+ * @since 0.8
+ */
+ public abstract StatsRecorder getStatsRecorder();
+
+ /**
+ * Returns the current {@code StatsCollectionState}.
+ *
+ * <p>When no implementation is available, {@code getState} always returns {@link
+ * StatsCollectionState#DISABLED}.
+ *
+ * <p>Once {@link #getState()} is called, subsequent calls to {@link
+ * #setState(StatsCollectionState)} will throw an {@code IllegalStateException}.
+ *
+ * @return the current {@code StatsCollectionState}.
+ * @since 0.8
+ */
+ public abstract StatsCollectionState getState();
+
+ /**
+ * Sets the current {@code StatsCollectionState}.
+ *
+ * <p>When no implementation is available, {@code setState} does not change the state.
+ *
+ * <p>If state is set to {@link StatsCollectionState#DISABLED}, all stats that are previously
+ * recorded will be cleared.
+ *
+ * @param state the new {@code StatsCollectionState}.
+ * @throws IllegalStateException if {@link #getState()} was previously called.
+ * @deprecated This method is deprecated because other libraries could cache the result of {@link
+ * #getState()}, use a stale value, and behave incorrectly. It is only safe to call early in
+ * initialization. This method throws {@link IllegalStateException} after {@code getState()}
+ * has been called, in order to limit changes to the result of {@code getState()}.
+ * @since 0.8
+ */
+ @Deprecated
+ public abstract void setState(StatsCollectionState state);
+}