Add CDS simulator to policy-models

Added CDS simulator to policy-models.  Added a test case to the CDS
Actor to verify that it works with the simulator.

Issue-ID: POLICY-2676
Change-Id: I9b10de3bde93c69e82df983f77eecc253de8a1a2
Signed-off-by: Jim Hahn <jrh3@att.com>

3 files changed, 173 insertions, 18 deletions

diff --git a/models-interactions/model-simulators/src/main/java/org/onap/policy/simulators/CdsSimulator.java b/models-interactions/model-simulators/src/main/java/org/onap/policy/simulators/CdsSimulator.java
new file mode 100644
index 000000000..dbbaa1681
--- /dev/null
+++ b/models-interactions/model-simulators/src/main/java/org/onap/policy/simulators/CdsSimulator.java
@@ -0,0 +1,104 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2020 Nordix Foundation.
+ *  Modifications Copyright (C) 2020 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.simulators;
+
+import com.google.protobuf.InvalidProtocolBufferException;
+import com.google.protobuf.util.JsonFormat;
+import io.grpc.Server;
+import io.grpc.netty.NettyServerBuilder;
+import io.grpc.stub.StreamObserver;
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.nio.charset.StandardCharsets;
+import lombok.Getter;
+import org.apache.commons.io.IOUtils;
+import org.onap.ccsdk.cds.controllerblueprints.processing.api.BluePrintProcessingServiceGrpc.BluePrintProcessingServiceImplBase;
+import org.onap.ccsdk.cds.controllerblueprints.processing.api.ExecutionServiceInput;
+import org.onap.ccsdk.cds.controllerblueprints.processing.api.ExecutionServiceOutput;
+import org.onap.ccsdk.cds.controllerblueprints.processing.api.ExecutionServiceOutput.Builder;
+
+public class CdsSimulator {
+    @Getter
+    private final int port;
+
+    private final Server server;
+
+    /**
+     * Constructs the object, but does not start it.
+     *
+     * @param host host name of the server
+     * @param port port of the server
+     */
+    public CdsSimulator(String host, int port) {
+        this.port = port;
+
+        BluePrintProcessingServiceImplBase testCdsBlueprintServerImpl = new BluePrintProcessingServiceImplBase() {
+
+            @Override
+            public StreamObserver<ExecutionServiceInput> process(
+                            final StreamObserver<ExecutionServiceOutput> responseObserver) {
+
+                return new StreamObserver<ExecutionServiceInput>() {
+
+                    @Override
+                    public void onNext(final ExecutionServiceInput executionServiceInput) {
+                        try {
+                            String responseString = IOUtils.toString(
+                                            getClass().getResource("cds/CreateSubscriptionResponseEvent.json"),
+                                            StandardCharsets.UTF_8);
+                            Builder builder = ExecutionServiceOutput.newBuilder();
+                            JsonFormat.parser().ignoringUnknownFields().merge(responseString, builder);
+                            responseObserver.onNext(builder.build());
+
+                        } catch (InvalidProtocolBufferException e) {
+                            throw new SimulatorRuntimeException("Cannot convert ExecutionServiceOutput output", e);
+
+                        } catch (IOException e) {
+                            throw new SimulatorRuntimeException("Cannot read ExecutionServiceOutput from file", e);
+                        }
+                    }
+
+                    @Override
+                    public void onError(final Throwable throwable) {
+                        responseObserver.onError(throwable);
+                    }
+
+                    @Override
+                    public void onCompleted() {
+                        responseObserver.onCompleted();
+                    }
+                };
+            }
+        };
+
+        server = NettyServerBuilder.forAddress(new InetSocketAddress(host, port)).addService(testCdsBlueprintServerImpl)
+                        .build();
+    }
+
+    public void start() throws IOException {
+        server.start();
+    }
+
+    public void stop() {
+        server.shutdown();
+    }
+}
diff --git a/models-interactions/model-simulators/src/main/java/org/onap/policy/simulators/SimulatorRuntimeException.java b/models-interactions/model-simulators/src/main/java/org/onap/policy/simulators/SimulatorRuntimeException.java
new file mode 100644
index 000000000..b97e4d9f7
--- /dev/null
+++ b/models-interactions/model-simulators/src/main/java/org/onap/policy/simulators/SimulatorRuntimeException.java
@@ -0,0 +1,41 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2020 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.simulators;
+
+public class SimulatorRuntimeException extends RuntimeException {
+    private static final long serialVersionUID = 1L;
+
+    public SimulatorRuntimeException() {
+        super();
+    }
+
+    public SimulatorRuntimeException(String message) {
+        super(message);
+    }
+
+    public SimulatorRuntimeException(Throwable cause) {
+        super(cause);
+    }
+
+    public SimulatorRuntimeException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}
diff --git a/models-interactions/model-simulators/src/main/java/org/onap/policy/simulators/Util.java b/models-interactions/model-simulators/src/main/java/org/onap/policy/simulators/Util.java
index 5cb518f4e..efc40367b 100644
--- a/models-interactions/model-simulators/src/main/java/org/onap/policy/simulators/Util.java
+++ b/models-interactions/model-simulators/src/main/java/org/onap/policy/simulators/Util.java
@@ -21,6 +21,7 @@
 
 package org.onap.policy.simulators;
 
+import java.io.IOException;
 import java.util.Properties;
 import org.onap.policy.common.endpoints.http.server.HttpServletServer;
 import org.onap.policy.common.endpoints.http.server.HttpServletServerFactoryInstance;
@@ -46,6 +47,7 @@ public class Util {
     public static final int VFCSIM_SERVER_PORT = 6668;
     public static final int GUARDSIM_SERVER_PORT = 6669;
     public static final int SDNCSIM_SERVER_PORT = 6670;
+    public static final int CDSSIM_SERVER_PORT = 6671;
     public static final int DMAAPSIM_SERVER_PORT = 3904;
 
     private static final String CANNOT_PROCESS_PARAMETERS = "cannot parse parameters ";
@@ -67,9 +69,21 @@ public class Util {
                 .build(AAISIM_SERVER_NAME, LOCALHOST, AAISIM_SERVER_PORT, "/", false, true);
         testServer.addServletClass("/*", AaiSimulatorJaxRs.class.getName());
         testServer.waitedStart(5000);
-        if (!NetworkUtil.isTcpPortOpen(LOCALHOST, testServer.getPort(), 5, 10000L)) {
-            throw new IllegalStateException(CANNOT_CONNECT + testServer.getPort());
-        }
+        waitForServerToListen(testServer.getPort());
+        return testServer;
+    }
+
+    /**
+     * Build a CDS simulator.
+     *
+     * @return the simulator
+     * @throws InterruptedException if a thread is interrupted
+     * @throws IOException if an I/O error occurs
+     */
+    public static CdsSimulator buildCdsSim() throws InterruptedException, IOException {
+        final CdsSimulator testServer = new CdsSimulator(LOCALHOST, CDSSIM_SERVER_PORT);
+        testServer.start();
+        waitForServerToListen(testServer.getPort());
         return testServer;
     }
 
@@ -84,9 +98,7 @@ public class Util {
                 .build(SDNCSIM_SERVER_NAME, LOCALHOST, SDNCSIM_SERVER_PORT, "/", false, true);
         testServer.addServletClass("/*", SdncSimulatorJaxRs.class.getName());
         testServer.waitedStart(5000);
-        if (!NetworkUtil.isTcpPortOpen(LOCALHOST, testServer.getPort(), 5, 10000L)) {
-            throw new IllegalStateException(CANNOT_CONNECT + testServer.getPort());
-        }
+        waitForServerToListen(testServer.getPort());
         return testServer;
     }
 
@@ -102,9 +114,7 @@ public class Util {
                 .build(SOSIM_SERVER_NAME, LOCALHOST, SOSIM_SERVER_PORT, "/", false, true);
         testServer.addServletClass("/*", SoSimulatorJaxRs.class.getName());
         testServer.waitedStart(5000);
-        if (!NetworkUtil.isTcpPortOpen(LOCALHOST, testServer.getPort(), 5, 10000L)) {
-            throw new IllegalStateException(CANNOT_CONNECT + testServer.getPort());
-        }
+        waitForServerToListen(testServer.getPort());
         return testServer;
     }
 
@@ -119,9 +129,7 @@ public class Util {
                 .build(VFCSIM_SERVER_NAME, LOCALHOST, VFCSIM_SERVER_PORT, "/", false, true);
         testServer.addServletClass("/*", VfcSimulatorJaxRs.class.getName());
         testServer.waitedStart(5000);
-        if (!NetworkUtil.isTcpPortOpen(LOCALHOST, testServer.getPort(), 5, 10000L)) {
-            throw new IllegalStateException(CANNOT_CONNECT + testServer.getPort());
-        }
+        waitForServerToListen(testServer.getPort());
         return testServer;
     }
 
@@ -136,9 +144,7 @@ public class Util {
                 LOCALHOST, GUARDSIM_SERVER_PORT, "/", false, true);
         testServer.addServletClass("/*", GuardSimulatorJaxRs.class.getName());
         testServer.waitedStart(5000);
-        if (!NetworkUtil.isTcpPortOpen(LOCALHOST, testServer.getPort(), 5, 10000L)) {
-            throw new IllegalStateException(CANNOT_CONNECT + testServer.getPort());
-        }
+        waitForServerToListen(testServer.getPort());
         return testServer;
     }
 
@@ -170,9 +176,13 @@ public class Util {
 
         HttpServletServer testServer = HttpServletServerFactoryInstance.getServerFactory().build(props).get(0);
         testServer.waitedStart(5000);
-        if (!NetworkUtil.isTcpPortOpen(LOCALHOST, testServer.getPort(), 50, 1000L)) {
-            throw new IllegalStateException(CANNOT_CONNECT + testServer.getPort());
-        }
+        waitForServerToListen(testServer.getPort());
         return testServer;
     }
+
+    private static void waitForServerToListen(int port) throws InterruptedException {
+        if (!NetworkUtil.isTcpPortOpen(LOCALHOST, port, 200, 250L)) {
+            throw new IllegalStateException(CANNOT_CONNECT + port);
+        }
+    }
 }