Github user aledsage commented on a diff in the pull request:
https://github.com/apache/brooklyn-server/pull/800#discussion_r134724534
--- Diff:
policy/src/test/java/org/apache/brooklyn/policy/autoscaling/AutoScalerPolicyPoolSizeTest.java
---
@@ -0,0 +1,110 @@
+/*
+ * 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.policy.autoscaling;
+
+import com.google.common.collect.ImmutableList;
+import org.apache.brooklyn.api.entity.Entity;
+import org.apache.brooklyn.api.entity.EntitySpec;
+import org.apache.brooklyn.api.policy.PolicySpec;
+import org.apache.brooklyn.core.entity.Entities;
+import org.apache.brooklyn.core.entity.EntityAsserts;
+import org.apache.brooklyn.core.entity.trait.Resizable;
+import org.apache.brooklyn.core.test.BrooklynAppUnitTestSupport;
+import org.apache.brooklyn.core.test.entity.TestCluster;
+import org.apache.brooklyn.core.test.entity.TestSizeRecordingCluster;
+import org.apache.brooklyn.entity.stock.BasicStartable;
+import org.apache.brooklyn.util.collections.MutableList;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.testng.Assert;
+import org.testng.annotations.AfterMethod;
+import org.testng.annotations.BeforeMethod;
+import org.testng.annotations.Test;
+
+import java.util.List;
+
+public class AutoScalerPolicyPoolSizeTest extends
BrooklynAppUnitTestSupport {
+
+ private static final Logger LOG =
LoggerFactory.getLogger(AutoScalerPolicyPoolSizeTest.class);
+
+ private static final int CLUSTER_INIITIAL_SIZE = 3;
+ private static final int CLUSTER_MIN_SIZE = 2;
+ private static final int CLUSTER_MAX_SIZE = 4;
+
+ AutoScalerPolicy policy;
+ TestSizeRecordingCluster cluster;
+ List<Integer> resizes = MutableList.of();
+
+ @BeforeMethod(alwaysRun = true)
+ @Override
+ public void setUp() throws Exception {
+ super.setUp();
+ LOG.info("resetting " + getClass().getSimpleName());
+ cluster =
app.createAndManageChild(EntitySpec.create(TestSizeRecordingCluster.class)
+ .configure(TestCluster.INITIAL_SIZE, CLUSTER_INIITIAL_SIZE)
+ .configure(TestCluster.MEMBER_SPEC,
EntitySpec.create(BasicStartable.class))
+ );
+ PolicySpec<AutoScalerPolicy> policySpec =
PolicySpec.create(AutoScalerPolicy.class)
+ .configure(AutoScalerPolicy.RESIZE_OPERATOR, new
ResizeOperator() {
+ @Override
+ public Integer resize(Entity entity, Integer
desiredSize) {
+ LOG.info("resizing to " + desiredSize);
+ resizes.add(desiredSize);
+ return ((Resizable) entity).resize(desiredSize);
+ }
+ })
+ .configure(AutoScalerPolicy.MIN_POOL_SIZE,
CLUSTER_MIN_SIZE)
+ .configure(AutoScalerPolicy.MAX_POOL_SIZE,
CLUSTER_MAX_SIZE);
+ policy = cluster.policies().add(policySpec);
+ app.start(ImmutableList.of());
+ }
+
+ @AfterMethod(alwaysRun = true)
+ public void tearDown() throws Exception {
+ try {
+ if (policy != null) policy.destroy();
+ } finally {
+ super.tearDown();
+ cluster = null;
+ policy = null;
+ }
+ }
+
+ @Test
+ public void testResizeUp() throws Exception {
+ EntityAsserts.assertAttributeEqualsEventually(cluster,
TestCluster.GROUP_SIZE, CLUSTER_INIITIAL_SIZE);
+ // Simulate user expunging the entities manually
+ for (int i = 0; i < CLUSTER_MAX_SIZE - CLUSTER_MIN_SIZE; i++) {
--- End diff --
This sum seems weird: for your test it deletes `4 - 2` entities, which
takes us from initial size of 3 down to 1. But that feels more like coincidence
than design. Do you not want to delete `CLUSTER_INITIAL_SIZE - CLUSTER_MIN_SIZE
+ 1`?
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