Add sample SMS Sender implementation

components/sms-mgt/io.entgra.sms.mgt.core/src/main/java/io/entgra/sms/mgt/core/impl/SampleSenderImpl.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2021, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
+ *
+ * Entgra (Pvt) Ltd. 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 io.entgra.sms.mgt.core.impl;
+
+import io.entgra.sms.mgt.common.bean.SMSMessage;
+import io.entgra.sms.mgt.common.config.SMSGateway;
+import io.entgra.sms.mgt.common.exception.SMSSenderException;
+import io.entgra.sms.mgt.common.spi.SMSSender;
+import io.entgra.sms.mgt.core.config.SMSConfigurationManager;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+/**
+ * Sample sender class on how to implement the SMSSender
+ */
+public class SampleSenderImpl implements SMSSender {
+
+    private static final Log log = LogFactory.getLog(SampleSenderImpl.class);
+
+    @Override
+    public void sendSMS(SMSMessage smsMessage) throws SMSSenderException {
+
+        //Retrieve the default (isDefault=true) SMS Gateway in the SMS configuration in sms-config.xml
+        SMSGateway smsGateway = SMSConfigurationManager.getInstance().getSMSConfig().getDefaultSMSGateway();
+
+        //Retrieve the SMS Gateway by passing the Gateway name
+        smsGateway = SMSConfigurationManager.getInstance().getSMSConfig().getSMSGateway("sample");
+
+        //Retrieve the properties in the SMS Gateway by passing the property name
+        String sampleProperty = smsGateway.getPropertyByName("sample-property").getValue();
+
+        if (log.isDebugEnabled()) {
+            log.debug("This is a Sample Sender Implementation and the property value retrieved is '"
+                    + sampleProperty + "'");
+        }
+
+        //If any exception is catched, wrap and throw as SMSSenderException
+    }
+}