From 826c661819d044c8f1cf950795ee0f33cc7675c6 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton@traccar.org>
Date: Sun, 13 Nov 2022 16:44:15 -0800
Subject: Implement Kafka forwarding

---
 .../org/traccar/forward/EventForwarderKafka.java   | 61 ++++++++++++++++++++++
 .../traccar/forward/PositionForwarderKafka.java    | 55 +++++++++++++++++++
 2 files changed, 116 insertions(+)
 create mode 100644 src/main/java/org/traccar/forward/EventForwarderKafka.java
 create mode 100644 src/main/java/org/traccar/forward/PositionForwarderKafka.java

(limited to 'src/main/java/org/traccar/forward')

diff --git a/src/main/java/org/traccar/forward/EventForwarderKafka.java b/src/main/java/org/traccar/forward/EventForwarderKafka.java
new file mode 100644
index 000000000..71e06ddd1
--- /dev/null
+++ b/src/main/java/org/traccar/forward/EventForwarderKafka.java
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2022 Anton Tananaev (anton@traccar.org)
+ *
+ * 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.
+ */
+package org.traccar.forward;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.apache.kafka.clients.producer.KafkaProducer;
+import org.apache.kafka.clients.producer.Producer;
+import org.apache.kafka.clients.producer.ProducerRecord;
+import org.traccar.config.Config;
+import org.traccar.config.Keys;
+
+import java.util.Properties;
+
+public class EventForwarderKafka implements EventForwarder {
+
+    private final Producer<String, String> producer;
+    private final ObjectMapper objectMapper;
+
+    public EventForwarderKafka(Config config, ObjectMapper objectMapper) {
+        this.objectMapper = objectMapper;
+        Properties properties = new Properties();
+        properties.put("bootstrap.servers", config.getString(Keys.EVENT_FORWARD_URL));
+        properties.put("acks", "all");
+        properties.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
+        properties.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
+        producer = new KafkaProducer<>(properties);
+    }
+
+    @SuppressWarnings("deprecation")
+    @Override
+    protected void finalize() {
+        producer.close();
+    }
+
+    @Override
+    public void forward(EventData eventData, ResultHandler resultHandler) {
+        try {
+            String key = Long.toString(eventData.getDevice().getId());
+            String value = objectMapper.writeValueAsString(eventData);
+            producer.send(new ProducerRecord<>("events", key, value));
+            resultHandler.onResult(true, null);
+        } catch (JsonProcessingException e) {
+            resultHandler.onResult(false, e);
+        }
+    }
+
+}
diff --git a/src/main/java/org/traccar/forward/PositionForwarderKafka.java b/src/main/java/org/traccar/forward/PositionForwarderKafka.java
new file mode 100644
index 000000000..3921539ac
--- /dev/null
+++ b/src/main/java/org/traccar/forward/PositionForwarderKafka.java
@@ -0,0 +1,55 @@
+/*
+ * Copyright 2022 Anton Tananaev (anton@traccar.org)
+ *
+ * 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.
+ */
+package org.traccar.forward;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.apache.kafka.clients.producer.KafkaProducer;
+import org.apache.kafka.clients.producer.Producer;
+import org.apache.kafka.clients.producer.ProducerRecord;
+import org.traccar.config.Config;
+import org.traccar.config.Keys;
+
+import java.util.Properties;
+
+public class PositionForwarderKafka implements PositionForwarder {
+
+    private final Producer<String, String> producer;
+    private final ObjectMapper objectMapper;
+
+    public PositionForwarderKafka(Config config, ObjectMapper objectMapper) {
+        this.objectMapper = objectMapper;
+        Properties properties = new Properties();
+        properties.put("bootstrap.servers", config.getString(Keys.EVENT_FORWARD_URL));
+        properties.put("acks", "all");
+        properties.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
+        properties.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
+        producer = new KafkaProducer<>(properties);
+    }
+
+    @Override
+    public void forward(PositionData positionData, ResultHandler resultHandler) {
+        try {
+            String key = Long.toString(positionData.getDevice().getId());
+            String value = objectMapper.writeValueAsString(positionData);
+            producer.send(new ProducerRecord<>("positions", key, value));
+            resultHandler.onResult(true, null);
+        } catch (JsonProcessingException e) {
+            resultHandler.onResult(false, e);
+        }
+    }
+
+}
-- 
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