Temporarily move "metrics" package into impl_core/ for release. (#1426)

The "metrics" package isn't ready to be released yet, so this commit moves it
out of the API artifact.  The package can still be accessed by the stats
implementation in impl_core/.  This commit can be reverted once the package is
ready to be exposed.  The moved package names also contain "temporary" so that
there is no possibility of class name conflicts between different versions of
opencensus-api and opencensus-impl-core.  For example,
io.opencensus.metrics.export is renamed to
io.opencensus.implcore.temporary.metrics.export.

Author: sebright2

api/src/main/java/io/opencensus/common/ToDoubleFunction.java

@@ -17,7 +17,7 @@
 package io.opencensus.common;
 
 /**
- * Represents a function that produces a double-valued result. See {@link
+ * Represents a function that produces a double-valued result. See {@code
  * io.opencensus.metrics.MetricRegistry} for an example of its use.
  *
  * <p>Note: This class is based on the java.util.ToDoubleFunction class added in Java 1.8. We cannot

api/src/main/java/io/opencensus/common/ToLongFunction.java

@@ -17,7 +17,7 @@
 package io.opencensus.common;
 
 /**
- * Represents a function that produces a long-valued result. See {@link
+ * Represents a function that produces a long-valued result. See {@code
  * io.opencensus.metrics.MetricRegistry} for an example of its use.
  *
  * <p>Note: This class is based on the java.util.ToLongFunction class added in Java 1.8. We cannot

buildscripts/import-control.xml

@@ -38,10 +38,10 @@ General guidelines on imports:
     <allow pkg="io.opencensus.internal"/>
     <allow pkg="io.opencensus.tags"/>
   </subpackage>
-  <subpackage name="metrics">
+  <subpackage name="implcore.temporary.metrics">
     <allow pkg="io.opencensus.internal"/>
     <allow pkg="io.opencensus.common"/>
-    <allow pkg="io.opencensus.metrics"/>
+    <allow pkg="io.opencensus.implcore.temporary.metrics"/>
   </subpackage>
   <subpackage name="stats">
     <allow pkg="io.opencensus.common"/>
@@ -182,7 +182,7 @@ General guidelines on imports:
     <allow pkg="com.google.common"/>
     <allow pkg="io.opencensus.common"/>
     <allow pkg="io.opencensus.implcore"/>
-    <allow pkg="io.opencensus.metrics"/>
+    <allow pkg="io.opencensus.implcore.temporary.metrics"/>
     <allow pkg="io.opencensus.stats"/>
     <allow pkg="io.opencensus.tags"/>
     <allow pkg="io.opencensus.trace"/>
@@ -192,7 +192,7 @@ General guidelines on imports:
     <allow pkg="io.opencensus.common"/>
     <allow pkg="io.opencensus.impl"/>
     <allow pkg="io.opencensus.implcore"/>
-    <allow pkg="io.opencensus.metrics"/>
+    <allow pkg="io.opencensus.implcore.temporary.metrics"/>
     <allow pkg="io.opencensus.stats"/>
     <allow pkg="io.opencensus.tags"/>
     <allow pkg="io.opencensus.trace"/>
@@ -201,7 +201,7 @@ General guidelines on imports:
     <allow pkg="io.opencensus.common"/>
     <allow pkg="io.opencensus.implcore"/>
     <allow pkg="io.opencensus.impllite"/>
-    <allow pkg="io.opencensus.metrics"/>
+    <allow pkg="io.opencensus.implcore.temporary.metrics"/>
     <allow pkg="io.opencensus.stats"/>
     <allow pkg="io.opencensus.tags"/>
     <allow pkg="io.opencensus.trace"/>

impl/src/main/java/io/opencensus/impl/metrics/MetricsComponentImpl.java

@@ -18,7 +18,7 @@
 
 import io.opencensus.implcore.common.MillisClock;
 import io.opencensus.implcore.metrics.MetricsComponentImplBase;
-import io.opencensus.metrics.MetricsComponent;
+import io.opencensus.implcore.temporary.metrics.MetricsComponent;
 
 /** Implementation of {@link MetricsComponent}. */
 public final class MetricsComponentImpl extends MetricsComponentImplBase {

impl/src/test/java/io/opencensus/impl/metrics/MetricsTest.java

@@ -20,8 +20,8 @@
 
 import io.opencensus.implcore.metrics.MetricRegistryImpl;
 import io.opencensus.implcore.metrics.export.ExportComponentImpl;
-import io.opencensus.metrics.Metrics;
-import io.opencensus.metrics.MetricsComponent;
+import io.opencensus.implcore.temporary.metrics.Metrics;
+import io.opencensus.implcore.temporary.metrics.MetricsComponent;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;

impl_core/src/main/java/io/opencensus/implcore/metrics/Gauge.java

@@ -21,14 +21,14 @@
 import io.opencensus.common.Clock;
 import io.opencensus.common.ToDoubleFunction;
 import io.opencensus.common.ToLongFunction;
-import io.opencensus.metrics.LabelKey;
-import io.opencensus.metrics.LabelValue;
-import io.opencensus.metrics.Metric;
-import io.opencensus.metrics.MetricDescriptor;
-import io.opencensus.metrics.MetricDescriptor.Type;
-import io.opencensus.metrics.Point;
-import io.opencensus.metrics.TimeSeries;
-import io.opencensus.metrics.Value;
+import io.opencensus.implcore.temporary.metrics.LabelKey;
+import io.opencensus.implcore.temporary.metrics.LabelValue;
+import io.opencensus.implcore.temporary.metrics.Metric;
+import io.opencensus.implcore.temporary.metrics.MetricDescriptor;
+import io.opencensus.implcore.temporary.metrics.MetricDescriptor.Type;
+import io.opencensus.implcore.temporary.metrics.Point;
+import io.opencensus.implcore.temporary.metrics.TimeSeries;
+import io.opencensus.implcore.temporary.metrics.Value;
 import java.util.Collections;
 import java.util.List;
 

impl_core/src/main/java/io/opencensus/implcore/metrics/MetricRegistryImpl.java

@@ -23,10 +23,10 @@
 import io.opencensus.common.ToLongFunction;
 import io.opencensus.implcore.metrics.Gauge.DoubleGauge;
 import io.opencensus.implcore.metrics.Gauge.LongGauge;
-import io.opencensus.metrics.LabelKey;
-import io.opencensus.metrics.LabelValue;
-import io.opencensus.metrics.Metric;
-import io.opencensus.metrics.MetricRegistry;
+import io.opencensus.implcore.temporary.metrics.LabelKey;
+import io.opencensus.implcore.temporary.metrics.LabelValue;
+import io.opencensus.implcore.temporary.metrics.Metric;
+import io.opencensus.implcore.temporary.metrics.MetricRegistry;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;

impl_core/src/main/java/io/opencensus/implcore/metrics/MetricsComponentImplBase.java

@@ -18,8 +18,8 @@
 
 import io.opencensus.common.Clock;
 import io.opencensus.implcore.metrics.export.ExportComponentImpl;
-import io.opencensus.metrics.MetricRegistry;
-import io.opencensus.metrics.MetricsComponent;
+import io.opencensus.implcore.temporary.metrics.MetricRegistry;
+import io.opencensus.implcore.temporary.metrics.MetricsComponent;
 
 /** Implementation of {@link MetricsComponent}. */
 public class MetricsComponentImplBase extends MetricsComponent {

impl_core/src/main/java/io/opencensus/implcore/metrics/export/ExportComponentImpl.java

@@ -16,8 +16,8 @@
 
 package io.opencensus.implcore.metrics.export;
 
-import io.opencensus.metrics.export.ExportComponent;
-import io.opencensus.metrics.export.MetricProducerManager;
+import io.opencensus.implcore.temporary.metrics.export.ExportComponent;
+import io.opencensus.implcore.temporary.metrics.export.MetricProducerManager;
 
 /** Implementation of {@link ExportComponent}. */
 public final class ExportComponentImpl extends ExportComponent {

impl_core/src/main/java/io/opencensus/implcore/metrics/export/MetricProducerManagerImpl.java

@@ -17,8 +17,8 @@
 package io.opencensus.implcore.metrics.export;
 
 import com.google.common.base.Preconditions;
-import io.opencensus.metrics.MetricProducer;
-import io.opencensus.metrics.export.MetricProducerManager;
+import io.opencensus.implcore.temporary.metrics.MetricProducer;
+import io.opencensus.implcore.temporary.metrics.export.MetricProducerManager;
 import java.util.Collections;
 import java.util.LinkedHashSet;
 import java.util.Set;