Add Network Logging Feature

This is part 1 of introducing the mdc filter feature. Network
logging has to have interception points in order to pre/post
process messages coming in from a network endpoint.

The OrderedService interface and OrderedServiceImpl of the
drools-pdp project have now been migrated to common but is
also left in drools-pdp to mitigate disruption to existing
features. However for features that need to use common's
OrderedServiceImpl and drools-pdp version of OrderedServiceImpl
there will be a conflict with getSequenceNumber(). So a migration
of the other features is suggested.

Network logging is moved to its own util class so that feature
hooks can be invoked any time an event is being logged by a
network logger. This util class will also be accessible to
drools-applications in the case where drools-applications
would like to invoke network logging features for REST events.

Change-Id: I83d7c46e5abb351486f841c3be4d9009f7992476
Issue-ID: POLICY-1499
Signed-off-by: Daniel Cruz <dc443y@att.com>

4 files changed, 210 insertions, 53 deletions

diff --git a/utils/src/test/java/org/onap/policy/common/utils/resources/ResourceUtilsTest.java b/utils/src/test/java/org/onap/policy/common/utils/resources/ResourceUtilsTest.java
index eb918d35..e5a79bc3 100644
--- a/utils/src/test/java/org/onap/policy/common/utils/resources/ResourceUtilsTest.java
+++ b/utils/src/test/java/org/onap/policy/common/utils/resources/ResourceUtilsTest.java
@@ -250,7 +250,9 @@ public class ResourceUtilsTest {
         assertNull(theString);
 
         theString = ResourceUtils.getResourceAsString("");
-        assertEquals("logback-test.xml\norg\ntestdir\n", theString);
+
+        assertEquals("logback-test.xml\nMETA-INF\norg\ntestdir\n", theString);
+
     }
 
     @Test
diff --git a/utils/src/test/java/org/onap/policy/common/utils/services/OrderedServiceImplTest.java b/utils/src/test/java/org/onap/policy/common/utils/services/OrderedServiceImplTest.java
new file mode 100644
index 00000000..39c8a2be
--- /dev/null
+++ b/utils/src/test/java/org/onap/policy/common/utils/services/OrderedServiceImplTest.java
@@ -0,0 +1,205 @@
+/*
+ * ============LICENSE_START=======================================================
+ * utils
+ * ================================================================================
+ * Copyright (C) 2019 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.common.utils.services;
+
+import static org.junit.Assert.assertEquals;
+
+import java.util.List;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+public class OrderedServiceImplTest {
+
+    private static final int HIGH_PRIORITY_NUM = -1000;
+    private static final int LOW_PRIORITY_NUM = 1000;
+
+    private static GenericService highPrioService;
+    private static GenericService lowPrioService;
+
+    /**
+     * Saves the original state of the ordered service list to restore after each test.
+     */
+    @BeforeClass
+    public static void setup() {
+        List<GenericService> implementers = GenericService.providers.getList();
+        highPrioService = implementers.get(0);
+        lowPrioService = implementers.get(1);
+    }
+
+    /**
+     * Restores original state after each test.
+     */
+    @Before
+    public void resetOrder() {
+        highPrioService.setSequenceNumber(HIGH_PRIORITY_NUM);
+        lowPrioService.setSequenceNumber(LOW_PRIORITY_NUM);
+    }
+
+    /**
+     * Tests obtaining a list of service implementers.
+     */
+    @Test
+    public void getListTest() {
+        List<GenericService> implementers = GenericService.providers.getList();
+        assertEquals(2, implementers.size());
+
+        assertEquals(highPrioService, implementers.get(0));
+        assertEquals(HIGH_PRIORITY_NUM, highPrioService.getSequenceNumber());
+
+        assertEquals(lowPrioService, implementers.get(1));
+        assertEquals(LOW_PRIORITY_NUM, lowPrioService.getSequenceNumber());
+    }
+
+    /**
+     * Tests inverting the priority of two services to ensure the list is rebuilt
+     * with the new order.
+     */
+    @Test
+    public void rebuildListInvertedPriorityTest() {
+
+        List<GenericService> implementers = GenericService.providers.getList();
+        assertEquals(2, implementers.size());
+
+        assertEquals(highPrioService, implementers.get(0));
+        assertEquals(HIGH_PRIORITY_NUM, highPrioService.getSequenceNumber());
+
+        assertEquals(lowPrioService, implementers.get(1));
+        assertEquals(LOW_PRIORITY_NUM, lowPrioService.getSequenceNumber());
+
+        highPrioService.setSequenceNumber(LOW_PRIORITY_NUM);
+        lowPrioService.setSequenceNumber(HIGH_PRIORITY_NUM);
+
+        implementers = GenericService.providers.rebuildList();
+        assertEquals(2, implementers.size());
+
+        assertEquals(lowPrioService, implementers.get(0));
+        assertEquals(HIGH_PRIORITY_NUM, lowPrioService.getSequenceNumber());
+
+        assertEquals(highPrioService, implementers.get(1));
+        assertEquals(LOW_PRIORITY_NUM, highPrioService.getSequenceNumber());
+
+    }
+
+    /**
+     * Tests that the service list is ordered alphabetically by class names
+     * if the priorities are equivalent.
+     */
+    @Test
+    public void rebuildListEqualPriorityTest() {
+
+        List<GenericService> implementers = GenericService.providers.getList();
+        assertEquals(2, implementers.size());
+
+        assertEquals(highPrioService, implementers.get(0));
+        assertEquals(HIGH_PRIORITY_NUM, highPrioService.getSequenceNumber());
+
+        assertEquals(lowPrioService, implementers.get(1));
+        assertEquals(LOW_PRIORITY_NUM, lowPrioService.getSequenceNumber());
+
+        highPrioService.setSequenceNumber(LOW_PRIORITY_NUM);
+        lowPrioService.setSequenceNumber(LOW_PRIORITY_NUM);
+
+        implementers = GenericService.providers.rebuildList();
+        assertEquals(2, implementers.size());
+
+        assertEquals(highPrioService, implementers.get(0));
+        assertEquals(LOW_PRIORITY_NUM, highPrioService.getSequenceNumber());
+
+        assertEquals(lowPrioService, implementers.get(1));
+        assertEquals(LOW_PRIORITY_NUM, lowPrioService.getSequenceNumber());
+
+    }
+
+    /**
+     * Test interface that extends OrderedService to allow changing the sequence number.
+     */
+    public static interface GenericService extends OrderedService {
+
+        /**
+         * Providers of the GenericService interface.
+         */
+        OrderedServiceImpl<GenericService> providers = new OrderedServiceImpl<>(GenericService.class);
+
+        /**
+         * Sets the sequence number of the service.
+         */
+        public void setSequenceNumber(int seqNum);
+
+    }
+
+    /**
+     * A high priority service class.
+     */
+    public static class HighPriorityService implements GenericService {
+
+        /**
+         * Defaults to a high priority.
+         */
+        private int seqNum = HIGH_PRIORITY_NUM;
+
+        /**
+         * {@inheritDoc}.
+         */
+        @Override
+        public int getSequenceNumber() {
+            return this.seqNum;
+        }
+
+        /**
+         * {@inheritDoc}.
+         */
+        @Override
+        public void setSequenceNumber(int seqNum) {
+            this.seqNum = seqNum;
+        }
+
+    }
+
+    /**
+     * A low priority service class.
+     */
+    public static class LowPriorityService implements GenericService {
+
+        /**
+         * Defaults to a low priority.
+         */
+        private int seqNum = LOW_PRIORITY_NUM;
+
+        /**
+         * {@inheritDoc}.
+         */
+        @Override
+        public int getSequenceNumber() {
+            return this.seqNum;
+        }
+
+        /**
+         * {@inheritDoc}.
+         */
+        @Override
+        public void setSequenceNumber(int seqNum) {
+            this.seqNum = seqNum;
+        }
+
+    }
+
+}
\ No newline at end of file
diff --git a/utils/src/test/java/org/onap/policy/common/utils/slf4j/LoggerFactoryWrapperTest.java b/utils/src/test/java/org/onap/policy/common/utils/slf4j/LoggerFactoryWrapperTest.java
deleted file mode 100644
index 4bf8db30..00000000
--- a/utils/src/test/java/org/onap/policy/common/utils/slf4j/LoggerFactoryWrapperTest.java
+++ /dev/null
@@ -1,52 +0,0 @@
-/*
- * ============LICENSE_START=======================================================
- * ONAP Policy Engine - Common Modules
- * ================================================================================
- * Copyright (C) 2019 Samsung Electronics. All rights reserved.
- * Modifications Copyright (C) 2019 AT&T Intellectual Property.
- * ================================================================================
- * 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.common.utils.slf4j;
-
-import static org.junit.Assert.assertSame;
-import static org.mockito.Mockito.mock;
-
-import org.junit.Test;
-import org.junit.runner.RunWith;
-
-import org.powermock.api.mockito.PowerMockito;
-import org.powermock.core.classloader.annotations.PrepareForTest;
-import org.powermock.modules.junit4.PowerMockRunner;
-
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-
-@RunWith(PowerMockRunner.class)
-@PrepareForTest(LoggerFactory.class)
-public class LoggerFactoryWrapperTest {
-    @Test
-    public void test_get_network_logger() {
-        String netLoggerName = "network";
-        Logger mockLogger = mock(Logger.class);
-
-        PowerMockito.mockStatic(LoggerFactory.class);
-
-        PowerMockito.when(LoggerFactory.getLogger(netLoggerName)).thenReturn(mockLogger);
-        assertSame(mockLogger, LoggerFactoryWrapper.getNetworkLogger());
-    }
-}
diff --git a/utils/src/test/resources/META-INF/services/org.onap.policy.common.utils.services.OrderedServiceImplTest$GenericService b/utils/src/test/resources/META-INF/services/org.onap.policy.common.utils.services.OrderedServiceImplTest$GenericService
new file mode 100644
index 00000000..1e920f46
--- /dev/null
+++ b/utils/src/test/resources/META-INF/services/org.onap.policy.common.utils.services.OrderedServiceImplTest$GenericService
@@ -0,0 +1,2 @@
+org.onap.policy.common.utils.services.OrderedServiceImplTest$HighPriorityService
+org.onap.policy.common.utils.services.OrderedServiceImplTest$LowPriorityService
\ No newline at end of file