Fix context clearing on model upgrade3.0.1-ONAP2.0.52.0.4

Existing context is cleared when a model upgrade is carried out
on an Apex PDP. The clear() method is called in error on the
Apex engine during the upgrade.

This change also has some small updates to the DecisionMaker example,
which is used to test this feature.

Issue-ID: POLICY-1395
Change-Id: I547a3a60712d1572d9daadf5eab4afcae2a5c321
Signed-off-by: liamfallon <liam.fallon@est.tech>
(cherry picked from commit cff079a8dc3eeaf4e88c0e89a828fe4244a1b3c8)

2 files changed, 128 insertions, 0 deletions

diff --git a/examples/examples-decisionmaker/src/main/resources/examples/config/DecisionMaker/ApexConfigRESTServerNoModel.json b/examples/examples-decisionmaker/src/main/resources/examples/config/DecisionMaker/ApexConfigRESTServerNoModel.json
new file mode 100644
index 000000000..85bb65e78
--- /dev/null
+++ b/examples/examples-decisionmaker/src/main/resources/examples/config/DecisionMaker/ApexConfigRESTServerNoModel.json
@@ -0,0 +1,60 @@
+{
+    "engineServiceParameters": {
+        "name": "MyApexEngine",
+        "version": "0.0.1",
+        "id": 45,
+        "instanceCount": 4,
+        "deploymentPort": 12345,
+        "engineParameters": {
+            "executorParameters": {
+                "JAVASCRIPT": {
+                    "parameterClassName": "org.onap.policy.apex.plugins.executor.javascript.JavascriptExecutorParameters"
+                }
+            }
+        }
+    },
+    "eventInputParameters": {
+        "RESTConsumer": {
+            "carrierTechnologyParameters": {
+                "carrierTechnology": "RESTSERVER",
+                "parameterClassName": "org.onap.policy.apex.plugins.event.carrier.restserver.RestServerCarrierTechnologyParameters",
+                "parameters": {
+                    "standalone": true,
+                    "host": "0.0.0.0",
+                    "port": 23324
+                }
+            },
+            "eventProtocolParameters": {
+                "eventProtocol": "JSON"
+            },
+            "synchronousMode": true,
+            "synchronousPeer": "RESTProducer",
+            "synchronousTimeout": 500
+        }
+    },
+    "eventOutputParameters": {
+        "logProducer": {
+            "carrierTechnologyParameters": {
+                "carrierTechnology": "FILE",
+                "parameters": {
+                    "fileName": "/tmp/EventsOut.json"
+                }
+            },
+            "eventProtocolParameters": {
+                "eventProtocol": "JSON"
+            }
+        },
+        "RESTProducer": {
+            "carrierTechnologyParameters":{
+                "carrierTechnology" : "RESTSERVER",
+                "parameterClassName" : "org.onap.policy.apex.plugins.event.carrier.restserver.RestServerCarrierTechnologyParameters"
+            },
+            "eventProtocolParameters":{
+                "eventProtocol" : "JSON"
+            },
+            "synchronousMode"    : true,
+            "synchronousPeer"    : "RESTConsumer",
+            "synchronousTimeout" : 500
+        }
+    }
+}
diff --git a/examples/examples-decisionmaker/src/test/java/org/onap/policy/apex/examples/decisionmaker/DecisionMakerRunner.java b/examples/examples-decisionmaker/src/test/java/org/onap/policy/apex/examples/decisionmaker/DecisionMakerRunner.java
new file mode 100644
index 000000000..1e264ab2c
--- /dev/null
+++ b/examples/examples-decisionmaker/src/test/java/org/onap/policy/apex/examples/decisionmaker/DecisionMakerRunner.java
@@ -0,0 +1,68 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2019 Nordix Foundation.
+ * ================================================================================
+ * 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.
+ * 
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.apex.examples.decisionmaker;
+
+import org.onap.policy.apex.auth.clieditor.ApexCommandLineEditorMain;
+import org.onap.policy.apex.core.infrastructure.threading.ThreadUtilities;
+import org.onap.policy.apex.model.basicmodel.concepts.ApexException;
+import org.onap.policy.apex.service.engine.main.ApexMain;
+
+/**
+ * Main method to run the decision maker example.
+ */
+public class DecisionMakerRunner {
+
+    private DecisionMakerRunner() throws ApexException {
+
+        // @formatter:off
+        final String[] cliArgs = new String[] {
+            "-c",
+            "src/main/resources/policy/DecisionMakerPolicyModel.apex",
+            "-l",
+            "target/DecisionMakerPolicyModel.log",
+            "-o",
+            "target/classes/DecisionMakerPolicyModel.json"
+        };
+        // @formatter:on
+
+        new ApexCommandLineEditorMain(cliArgs);
+
+        // @formatter:off
+        final String[] apexArgs = {
+            "-rfr",
+            "target/classes",
+            "-c",
+            "src/main/resources/examples/config/DecisionMaker/ApexConfigRESTServerNoModel.json",
+            "-m",
+            "target/classes/DecisionMakerPolicyModel.json"
+        };
+        // @formatter:on
+
+        final ApexMain apexMain = new ApexMain(apexArgs);
+
+        ThreadUtilities.sleep(1000000);
+        apexMain.shutdown();
+    }
+
+    public static void main(String[] args) throws ApexException {
+        new DecisionMakerRunner();
+    }
+}