Added SimpleSerDe to ser/deser basic types (apache#163)

pulsar-functions/runtime/src/main/java/org/apache/pulsar/functions/utils/SimpleSerDe.java

@@ -0,0 +1,139 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF 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 org.apache.pulsar.functions.utils;
+
+import com.google.common.collect.Sets;
+import org.apache.pulsar.functions.api.SerDe;
+
+import java.io.*;
+import java.lang.reflect.Type;
+import java.nio.charset.StandardCharsets;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * Simplest form of SerDe.
+ */
+public class SimpleSerDe implements SerDe {
+
+    private static final Set<Type> supportedInputTypes = Sets.newHashSet(
+            Integer.class,
+            Double.class,
+            Long.class,
+            String.class,
+            Short.class,
+            Byte.class,
+            Float.class,
+            Map.class,
+            List.class,
+            Object.class
+    );
+    private Type type;
+    private boolean ser;
+
+    public SimpleSerDe(Type type, boolean ser) {
+        this.type = type;
+        this.ser = ser;
+        verifySupportedType(type, ser);
+    }
+
+    @Override
+    public Object deserialize(byte[] input) {
+        if (ser) {
+            throw new RuntimeException("Serializer function cannot deserialize");
+        }
+        String data = new String(input, StandardCharsets.UTF_8);
+        if (type.equals(Integer.class)) {
+            return Integer.valueOf(data);
+        } else if (type.equals(Double.class)) {
+            return Double.valueOf(data);
+        } else if (type.equals(Long.class)) {
+            return Long.valueOf(data);
+        } else if (type.equals(String.class)) {
+            return data;
+        } else if (type.equals(Short.class)) {
+            return Short.valueOf(data);
+        } else if (type.equals(Byte.class)) {
+            return Byte.decode(data);
+        } else if (type.equals(Float.class)) {
+            return Float.valueOf(data);
+        } else if (type.equals(Map.class)) {
+            try {
+                ByteArrayInputStream byteIn = new ByteArrayInputStream(input);
+                ObjectInputStream in = new ObjectInputStream(byteIn);
+                return (Map<Object, Object>) in.readObject();
+            } catch (Exception ex) {
+                return null;
+            }
+        } else if (type.equals(List.class)) {
+            try {
+                ByteArrayInputStream byteIn = new ByteArrayInputStream(input);
+                ObjectInputStream in = new ObjectInputStream(byteIn);
+                return (List<Object>) in.readObject();
+            } catch (Exception ex) {
+                return null;
+            }
+        } else {
+            throw new RuntimeException("Unknown type " + type);
+        }
+    }
+
+    @Override
+    public byte[] serialize(Object input) {
+        if (!ser) {
+            throw new RuntimeException("DeSerializer function cannot serialize");
+        }
+        if (type.equals(Integer.class)) {
+            return ((Integer) input).toString().getBytes(StandardCharsets.UTF_8);
+        } else if (type.equals(Double.class)) {
+            return ((Double) input).toString().getBytes(StandardCharsets.UTF_8);
+        } else if (type.equals(Long.class)) {
+            return ((Long) input).toString().getBytes(StandardCharsets.UTF_8);
+        } else if (type.equals(String.class)) {
+            return ((String) input).getBytes(StandardCharsets.UTF_8);
+        } else if (type.equals(Short.class)) {
+            return ((Short) input).toString().getBytes(StandardCharsets.UTF_8);
+        } else if (type.equals(Byte.class)) {
+            return ((Byte) input).toString().getBytes(StandardCharsets.UTF_8);
+        } else if (type.equals(Float.class)) {
+            return ((Float) input).toString().getBytes(StandardCharsets.UTF_8);
+        } else if (type.equals(Map.class) || type.equals(List.class)) {
+            try {
+                ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
+                ObjectOutputStream out = new ObjectOutputStream(byteOut);
+                out.writeObject(input);
+                return byteOut.toByteArray();
+            } catch (Exception ex) {
+                return null;
+            }
+        } else {
+            throw new RuntimeException("Unknown type " + type);
+        }
+    }
+
+    public void verifySupportedType(Type type, boolean allowVoid) {
+        if (!allowVoid && !supportedInputTypes.contains(type)) {
+            throw new RuntimeException("Non Basic types not yet supported: " + type);
+        } else if (!(supportedInputTypes.contains(type) || type.equals(Void.class))) {
+            throw new RuntimeException("Non Basic types not yet supported: " + type);
+        }
+    }
+}

pulsar-functions/runtime/src/test/java/org/apache/pulsar/functions/utils/SimpleSerDeTest.java

@@ -0,0 +1,220 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF 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 org.apache.pulsar.functions.utils;
+
+import org.testng.annotations.Test;
+
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+
+import static org.testng.Assert.*;
+
+/**
+ * Unit test of {@link SimpleSerDe}.
+ */
+public class SimpleSerDeTest {
+    @Test
+    public void testStringSerDe() {
+        SimpleSerDe serializer = new SimpleSerDe(String.class, true);
+        SimpleSerDe deserializer = new SimpleSerDe(String.class, false);
+        String input = new String("input");
+        byte[] output = serializer.serialize(input);
+        String result = (String) deserializer.deserialize(output);
+        assertEquals(result, input);
+
+        try {
+            SimpleSerDe serDe = new SimpleSerDe(String.class, false);
+            serDe.serialize(new String("input"));
+            assertFalse(true);
+        } catch (Exception ex) {
+            // This is good
+        }
+
+        try {
+            SimpleSerDe serDe = new SimpleSerDe(String.class, true);
+            serDe.deserialize(new byte[10]);
+            assertFalse(true);
+        } catch (Exception ex) {
+            // This is good
+        }
+    }
+
+    @Test
+    public void testLongSerDe() {
+        SimpleSerDe serializer = new SimpleSerDe(Long.class, true);
+        SimpleSerDe deserializer = new SimpleSerDe(Long.class, false);
+        Long input = new Long(648292);
+        byte[] output = serializer.serialize(input);
+        Long result = (Long) deserializer.deserialize(output);
+        assertEquals(result, input);
+
+        try {
+            SimpleSerDe serDe = new SimpleSerDe(Long.class, false);
+            serDe.serialize(new Long(34242));
+            assertFalse(true);
+        } catch (Exception ex) {
+            // This is good
+        }
+
+        try {
+            SimpleSerDe serDe = new SimpleSerDe(Long.class, true);
+            serDe.deserialize(new byte[10]);
+            assertFalse(true);
+        } catch (Exception ex) {
+            // This is good
+        }
+    }
+
+    @Test
+    public void testDoubleSerDe() {
+        SimpleSerDe serializer = new SimpleSerDe(Double.class, true);
+        SimpleSerDe deserializer = new SimpleSerDe(Double.class, false);
+        Double input = new Double(648292.32432);
+        byte[] output = serializer.serialize(input);
+        Double result = (Double) deserializer.deserialize(output);
+        assertEquals(result, input);
+
+        try {
+            SimpleSerDe serDe = new SimpleSerDe(Double.class, false);
+            serDe.serialize(new Double(34242));
+            assertFalse(true);
+        } catch (Exception ex) {
+            // This is good
+        }
+
+        try {
+            SimpleSerDe serDe = new SimpleSerDe(Double.class, true);
+            serDe.deserialize(new byte[10]);
+            assertFalse(true);
+        } catch (Exception ex) {
+            // This is good
+        }
+    }
+
+    @Test
+    public void testFloatSerDe() {
+        SimpleSerDe serializer = new SimpleSerDe(Float.class, true);
+        SimpleSerDe deserializer = new SimpleSerDe(Float.class, false);
+        Float input = new Float(354353.54654);
+        byte[] output = serializer.serialize(input);
+        Float result = (Float) deserializer.deserialize(output);
+        assertEquals(result, input);
+
+        try {
+            SimpleSerDe serDe = new SimpleSerDe(Float.class, false);
+            serDe.serialize(new Float(34242));
+            assertFalse(true);
+        } catch (Exception ex) {
+            // This is good
+        }
+
+        try {
+            SimpleSerDe serDe = new SimpleSerDe(Float.class, true);
+            serDe.deserialize(new byte[10]);
+            assertFalse(true);
+        } catch (Exception ex) {
+            // This is good
+        }
+    }
+
+    @Test
+    public void testIntegerSerDe() {
+        SimpleSerDe serializer = new SimpleSerDe(Integer.class, true);
+        SimpleSerDe deserializer = new SimpleSerDe(Integer.class, false);
+        Integer input = new Integer(2542352);
+        byte[] output = serializer.serialize(input);
+        Integer result = (Integer) deserializer.deserialize(output);
+        assertEquals(result, input);
+
+        try {
+            SimpleSerDe serDe = new SimpleSerDe(Integer.class, false);
+            serDe.serialize(new Integer(34242));
+            assertFalse(true);
+        } catch (Exception ex) {
+            // This is good
+        }
+
+        try {
+            SimpleSerDe serDe = new SimpleSerDe(Integer.class, true);
+            serDe.deserialize(new byte[10]);
+            assertFalse(true);
+        } catch (Exception ex) {
+            // This is good
+        }
+    }
+
+    @Test
+    public void testMapSerDe() {
+        SimpleSerDe serializer = new SimpleSerDe(Map.class, true);
+        SimpleSerDe deserializer = new SimpleSerDe(Map.class, false);
+        Map<String, String> input = new HashMap<>();
+        input.put("Key", "Value");
+        byte[] output = serializer.serialize(input);
+        Map result = (Map) deserializer.deserialize(output);
+        assertEquals(result.size(), input.size());
+        assertEquals(result.get("Key"), input.get("Key"));
+
+        try {
+            SimpleSerDe serDe = new SimpleSerDe(Map.class, false);
+            serDe.serialize(new HashMap());
+            assertFalse(true);
+        } catch (Exception ex) {
+            // This is good
+        }
+
+        try {
+            SimpleSerDe serDe = new SimpleSerDe(Map.class, true);
+            serDe.deserialize(new byte[10]);
+            assertFalse(true);
+        } catch (Exception ex) {
+            // This is good
+        }
+    }
+
+    @Test
+    public void testListSerDe() {
+        SimpleSerDe serializer = new SimpleSerDe(List.class, true);
+        SimpleSerDe deserializer = new SimpleSerDe(List.class, false);
+        List<Integer> input = new LinkedList<>();
+        input.add(1234);
+        byte[] output = serializer.serialize(input);
+        List result = (List) deserializer.deserialize(output);
+        assertEquals(result.size(), input.size());
+        assertEquals(result.get(0), input.get(0));
+
+        try {
+            SimpleSerDe serDe = new SimpleSerDe(List.class, false);
+            serDe.serialize(new LinkedList<>());
+            assertFalse(true);
+        } catch (Exception ex) {
+            // This is good
+        }
+
+        try {
+            SimpleSerDe serDe = new SimpleSerDe(List.class, true);
+            serDe.deserialize(new byte[10]);
+            assertFalse(true);
+        } catch (Exception ex) {
+            // This is good
+        }
+    }
+}