Create interfaces for Policy Distribution

Created interfaces and some skeletal implementations. Implememtations to
be further developed in subsequent stories

Change-Id: If55be78e34c8783451cb9aa755a563bc0850e569
Issue-ID: POLICY-1029
Signed-off-by: mmis <michael.morris@ericsson.com>

2 files changed, 216 insertions, 0 deletions

diff --git a/reception/src/test/java/org/onap/policy/distribution/reception/decoding/PolicyDecodingExceptionTest.java b/reception/src/test/java/org/onap/policy/distribution/reception/decoding/PolicyDecodingExceptionTest.java
new file mode 100644
index 00000000..eba19503
--- /dev/null
+++ b/reception/src/test/java/org/onap/policy/distribution/reception/decoding/PolicyDecodingExceptionTest.java
@@ -0,0 +1,42 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2016-2018 Ericsson. 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.distribution.reception.decoding;
+
+import static org.junit.Assert.assertEquals;
+import org.junit.Test;
+
+public class PolicyDecodingExceptionTest {
+
+    @Test
+    public void testPolicyDecodingExceptionString() {
+        PolicyDecodingException policyDecodingException = new PolicyDecodingException("error message");
+        assertEquals("error message", policyDecodingException.getMessage());
+    }
+
+    @Test
+    public void testPolicyDecodingExceptionStringThrowable() {
+        Exception cause = new IllegalArgumentException();
+        PolicyDecodingException policyDecodingException = new PolicyDecodingException("error message", cause);
+        assertEquals("error message", policyDecodingException.getMessage());
+        assertEquals(cause, policyDecodingException.getCause());
+    }
+
+}
diff --git a/reception/src/test/java/org/onap/policy/distribution/reception/handling/AbstractReceptionHandlerTest.java b/reception/src/test/java/org/onap/policy/distribution/reception/handling/AbstractReceptionHandlerTest.java
new file mode 100644
index 00000000..3f033eb0
--- /dev/null
+++ b/reception/src/test/java/org/onap/policy/distribution/reception/handling/AbstractReceptionHandlerTest.java
@@ -0,0 +1,174 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2018 Ericsson. 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.distribution.reception.handling;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+import java.lang.reflect.Field;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import org.junit.Test;
+import org.onap.policy.distribution.forwarding.PolicyForwarder;
+import org.onap.policy.distribution.forwarding.PolicyForwardingException;
+import org.onap.policy.distribution.model.Policy;
+import org.onap.policy.distribution.model.PolicyInput;
+import org.onap.policy.distribution.reception.decoding.PolicyDecoder;
+import org.onap.policy.distribution.reception.decoding.PolicyDecodingException;
+
+public class AbstractReceptionHandlerTest {
+
+    @Test
+    public void testInputReceived() throws PolicyDecodingException, NoSuchFieldException, SecurityException,
+            IllegalArgumentException, IllegalAccessException {
+        AbstractReceptionHandler handler = new DummyReceptionHandler();
+
+        Policy generatedPolicy1 = new DummyPolicy1();
+        Policy generatedPolicy2 = new DummyPolicy2();
+
+        PolicyDecoder<PolicyInput, Policy> policyDecoder1 =
+                new DummyDecoder(true, Collections.singletonList(generatedPolicy1));
+        PolicyDecoder<PolicyInput, Policy> policyDecoder2 =
+                new DummyDecoder(true, Collections.singletonList(generatedPolicy2));
+
+        Collection<PolicyDecoder<PolicyInput, Policy>> policyDecoders = new ArrayList<>();
+        policyDecoders.add(policyDecoder1);
+        policyDecoders.add(policyDecoder2);
+
+        DummyPolicyForwarder policyForwarder1 = new DummyPolicyForwarder();
+        DummyPolicyForwarder policyForwarder2 = new DummyPolicyForwarder();
+
+        Collection<PolicyForwarder> policyForwarders = new ArrayList<>();
+        policyForwarders.add(policyForwarder1);
+        policyForwarders.add(policyForwarder2);
+
+        setUpPlugins(handler, policyDecoders, policyForwarders);
+
+        handler.inputReceived(new DummyPolicyInput());
+
+        assertEquals(2, policyForwarder1.getNumberOfPoliciesReceived());
+        assertTrue(policyForwarder1.receivedPolicy(generatedPolicy1));
+        assertTrue(policyForwarder1.receivedPolicy(generatedPolicy2));
+        assertEquals(2, policyForwarder2.getNumberOfPoliciesReceived());
+        assertTrue(policyForwarder2.receivedPolicy(generatedPolicy1));
+        assertTrue(policyForwarder2.receivedPolicy(generatedPolicy2));
+    }
+
+    @Test(expected = PolicyDecodingException.class)
+    public void testInputReceivedNoSupportingDecoder() throws PolicyDecodingException, NoSuchFieldException,
+            SecurityException, IllegalArgumentException, IllegalAccessException {
+        AbstractReceptionHandler handler = new DummyReceptionHandler();
+
+        PolicyDecoder<PolicyInput, Policy> policyDecoder = new DummyDecoder(false, Collections.emptyList());
+        DummyPolicyForwarder policyForwarder = new DummyPolicyForwarder();
+        setUpPlugins(handler, Collections.singleton(policyDecoder), Collections.singleton(policyForwarder));
+
+        handler.inputReceived(new DummyPolicyInput());
+    }
+
+    @Test(expected = PolicyDecodingException.class)
+    public void testInputReceivedNoDecoder() throws PolicyDecodingException, NoSuchFieldException, SecurityException,
+            IllegalArgumentException, IllegalAccessException {
+        AbstractReceptionHandler handler = new DummyReceptionHandler();
+
+        DummyPolicyForwarder policyForwarder = new DummyPolicyForwarder();
+        setUpPlugins(handler, Collections.emptySet(), Collections.singleton(policyForwarder));
+
+        handler.inputReceived(new DummyPolicyInput());
+    }
+
+    class DummyReceptionHandler extends AbstractReceptionHandler {
+        @Override
+        protected void initializeReception(String parameterGroupName) {}
+
+        @Override
+        public void destroy() {}
+    }
+
+    class DummyPolicyInput implements PolicyInput {
+    }
+    class DummyPolicy1 implements Policy {
+    }
+    class DummyPolicy2 implements Policy {
+    }
+
+    public class DummyDecoder implements PolicyDecoder<PolicyInput, Policy> {
+
+        private boolean canHandleValue;
+        private Collection<Policy> policesToReturn;
+
+        public DummyDecoder(boolean canHandleValue, Collection<Policy> policesToReturn) {
+            this.canHandleValue = canHandleValue;
+            this.policesToReturn = policesToReturn;
+        }
+
+        @Override
+        public boolean canHandle(PolicyInput policyInput) {
+            return canHandleValue;
+        }
+
+        @Override
+        public Collection<Policy> decode(PolicyInput input) throws PolicyDecodingException {
+            return policesToReturn;
+        }
+    }
+
+    public class DummyPolicyForwarder implements PolicyForwarder {
+        private int numberOfPoliciesReceived = 0;
+        private Collection<Policy> policiesReceived = new ArrayList<>();
+
+        @Override
+        public void forward(Collection<Policy> policies) throws PolicyForwardingException {
+            numberOfPoliciesReceived += policies.size();
+            policiesReceived.addAll(policies);
+        }
+
+        public int getNumberOfPoliciesReceived() {
+            return numberOfPoliciesReceived;
+        }
+
+        public boolean receivedPolicy(Policy policy) {
+            return policiesReceived.contains(policy);
+        }
+    }
+
+    /**
+     * Only needed until code is added for instantiating plugins from paramater file
+     */
+    private void setUpPlugins(AbstractReceptionHandler receptionHandler,
+            Collection<PolicyDecoder<PolicyInput, Policy>> decoders, Collection<PolicyForwarder> forwarders)
+            throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException {
+        PluginHandler pluginHandler = new PluginHandler("");
+
+        Field decodersField = pluginHandler.getClass().getDeclaredField("policyDecoders");
+        decodersField.setAccessible(true);
+        decodersField.set(pluginHandler, decoders);
+
+        Field forwardersField = pluginHandler.getClass().getDeclaredField("policyForwarders");
+        forwardersField.setAccessible(true);
+        forwardersField.set(pluginHandler, forwarders);
+
+        Field pluginHandlerField = AbstractReceptionHandler.class.getDeclaredField("pluginHandler");
+        pluginHandlerField.setAccessible(true);
+        pluginHandlerField.set(receptionHandler, pluginHandler);
+    }
+
+}