Github user aledsage commented on a diff in the pull request:
https://github.com/apache/incubator-brooklyn/pull/919#discussion_r41168854
--- Diff:
core/src/test/java/org/apache/brooklyn/enricher/stock/reducer/ReducerTest.java
---
@@ -0,0 +1,255 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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 org.apache.brooklyn.enricher.stock.reducer;
+
+import java.util.List;
+import java.util.Map;
+
+import javax.annotation.Nullable;
+
+import org.apache.brooklyn.api.entity.EntitySpec;
+import org.apache.brooklyn.api.sensor.AttributeSensor;
+import org.apache.brooklyn.api.sensor.EnricherSpec;
+import org.apache.brooklyn.core.sensor.Sensors;
+import org.apache.brooklyn.core.test.BrooklynAppUnitTestSupport;
+import org.apache.brooklyn.core.test.entity.TestEntity;
+import org.apache.brooklyn.enricher.stock.Enrichers;
+import org.apache.brooklyn.enricher.stock.reducer.Reducer;
+import org.apache.brooklyn.enricher.stock.reducer.StringStringReducer;
+import org.apache.brooklyn.test.Asserts;
+import org.apache.brooklyn.test.EntityTestUtils;
+import org.apache.brooklyn.util.collections.MutableMap;
+import org.apache.brooklyn.util.exceptions.Exceptions;
+import org.testng.Assert;
+import org.testng.annotations.BeforeMethod;
+import org.testng.annotations.Test;
+
+import com.google.common.base.Function;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+
+public class ReducerTest extends BrooklynAppUnitTestSupport {
+
+ public static final AttributeSensor<String> STR1 =
Sensors.newStringSensor("test.str1");
+ public static final AttributeSensor<String> STR2 =
Sensors.newStringSensor("test.str2");
+ public static final AttributeSensor<String> STR3 =
Sensors.newStringSensor("test.str3");
+ public static final AttributeSensor<Integer> INT1 =
Sensors.newIntegerSensor("test.int1");
+
+ private TestEntity entity;
+
+ @BeforeMethod(alwaysRun=true)
+ @Override
+ public void setUp() throws Exception {
+ super.setUp();
+ entity =
app.createAndManageChild(EntitySpec.create(TestEntity.class));
+ }
+
+ @Test
+ public void testBasicReducer(){
+
entity.addEnricher(EnricherSpec.create(StringStringReducer.class).configure(
+ MutableMap.of(
+ Reducer.SOURCE_SENSORS, ImmutableList.of(STR1, STR2),
+ Reducer.PRODUCER, entity,
+ Reducer.TARGET_SENSOR, STR3,
+ Reducer.REDUCER_FUNCTION, new Concatenator())
+ )
+ );
+
+ EntityTestUtils.assertAttributeEquals(entity, STR3, null);
+
+ entity.sensors().set(STR1, "foo");
+ EntityTestUtils.assertAttributeEqualsContinually(entity, STR3,
null);
+
+ entity.sensors().set(STR2, "bar");
+ EntityTestUtils.assertAttributeEqualsEventually(entity, STR3,
"foobar");
+ }
+
+ @Test
+ public void testReducingBuilderWithConcatenator() {
+ entity.addEnricher(Enrichers.builder()
+ .reducing(StringStringReducer.class,
ImmutableList.of(STR1, STR2))
+ .from(entity)
+ .computing(new Concatenator())
+ .publishing(STR3)
+ .build()
+ );
+
+ EntityTestUtils.assertAttributeEquals(entity, STR3, null);
+
+ entity.sensors().set(STR1, "foo");
+ EntityTestUtils.assertAttributeEqualsContinually(entity, STR3,
null);
+
+ entity.sensors().set(STR2, "bar");
+ EntityTestUtils.assertAttributeEqualsEventually(entity, STR3,
"foobar");
+ }
+
+ @Test
+ public void testReducingBuilderWithLengthCalculator() {
+ entity.addEnricher(Enrichers.builder()
+ .reducing(StringIntegerReducer.class,
ImmutableList.of(STR1, STR2))
+ .from(entity)
+ .computing(new LengthCalculator())
+ .publishing(INT1)
+ .build()
+ );
+
+ EntityTestUtils.assertAttributeEquals(entity, INT1, null);
+
+ entity.sensors().set(STR1, "foo");
+ EntityTestUtils.assertAttributeEqualsContinually(entity, INT1,
null);
+
+ entity.sensors().set(STR2, "bar");
+ EntityTestUtils.assertAttributeEqualsEventually(entity, INT1, 6);
+ }
+
+ @Test
+ public void testReducingBuilderWithJoinerFunction() {
+ entity.addEnricher(Enrichers.builder()
+ .reducing(StringStringReducer.class,
ImmutableList.of(STR1, STR2))
+ .from(entity)
+ .computing("joiner", ImmutableMap.<String,
Object>of("separator", "-"))
+ .publishing(STR3)
+ .build()
+ );
+
+ EntityTestUtils.assertAttributeEquals(entity, STR3, null);
+
+ entity.sensors().set(STR1, "foo");
+ EntityTestUtils.assertAttributeEqualsContinually(entity, STR3,
null);
+
+ entity.sensors().set(STR2, "bar");
+ EntityTestUtils.assertAttributeEqualsEventually(entity, STR3,
"foo-bar");
+ }
+
+ @Test
+ public void
testReducingBuilderWithJoinerFunctionWithDefaultParameter() {
+ entity.addEnricher(Enrichers.builder()
+ .reducing(StringStringReducer.class, ImmutableList.of(STR1,
STR2))
+ .from(entity)
+ .computing("joiner")
+ .publishing(STR3)
+ .build()
+ );
+ EntityTestUtils.assertAttributeEquals(entity, STR3, null);
+
+ entity.sensors().set(STR1, "foo");
+ EntityTestUtils.assertAttributeEqualsContinually(entity, STR3,
null);
+
+ entity.sensors().set(STR2, "bar");
+ EntityTestUtils.assertAttributeEqualsEventually(entity, STR3,
"foo, bar");
+ }
+
+ @Test
+ public void testReducingBuilderWithJoinerFunctionAndUnusedParameter() {
+
+ entity.addEnricher(Enrichers.builder()
+ .reducing(StringStringReducer.class, ImmutableList.of(STR1,
STR2))
+ .from(entity)
+ .computing("joiner", ImmutableMap.<String,
Object>of("non.existent.parameter", "-"))
+ .publishing(STR3)
+ .build()
+ );
+ EntityTestUtils.assertAttributeEquals(entity, STR3, null);
+
+ entity.sensors().set(STR1, "foo");
+ EntityTestUtils.assertAttributeEqualsContinually(entity, STR3,
null);
+
+ entity.sensors().set(STR2, "bar");
+ EntityTestUtils.assertAttributeEqualsEventually(entity, STR3,
"foo, bar");
+ }
+
+ @Test
+ public void testReducingBuilderWithFormatStringFunction() {
+
+ entity.addEnricher(Enrichers.builder()
+ .reducing(StringStringReducer.class, ImmutableList.of(STR1,
STR2))
+ .from(entity)
+ .computing("formatString", ImmutableMap.<String,
Object>of("format", "hello, %s and %s"))
+ .publishing(STR3)
+ .build()
+ );
+ EntityTestUtils.assertAttributeEquals(entity, STR3, null);
+
+ entity.sensors().set(STR1, "foo");
+ EntityTestUtils.assertAttributeEqualsContinually(entity, STR3,
null);
+
+ entity.sensors().set(STR2, "bar");
+ EntityTestUtils.assertAttributeEqualsEventually(entity, STR3,
"hello, foo and bar");
+ }
+
+ @Test
+ public void testReducingBuilderWithNamedNonExistentFunction() {
+ try {
+ entity.addEnricher(Enrichers.builder()
+ .reducing(StringStringReducer.class,
ImmutableList.of(STR1, STR2))
+ .from(entity)
+ .computing("unknown function name", ImmutableMap.<String,
Object>of("separator", "-"))
+ .publishing(STR3)
+ .build()
+ );
+ Asserts.fail("Expected exception when adding reducing enricher
with unknown named function");
+ } catch (Exception e) {
+ Throwable t = Exceptions.getFirstThrowableOfType(e,
IllegalStateException.class);
+ Assert.assertNotNull(t);
+ }
+ }
+
+ private static class Concatenator implements Function<List<String>,
String> {
+ @Nullable
+ @Override
+ public String apply(List<String> values) {
+ StringBuilder result = new StringBuilder();
+ for (String value : values) {
+ if (value == null) {
+ return null;
+ } else {
+ result.append(value);
+ }
+ }
+ return result.toString();
+ }
+ }
+
+ public static class StringIntegerReducer extends Reducer<String,
Integer> {
--- End diff --
It's worrying that you're defining this in the test - that presumably means
it's impossible to do it in yaml, because this class doesn't exist and there is
no other way to do it other than writing the code yourself?
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