Add Deserializer interface

log4j2-elasticsearch-core/src/main/java/org/appenders/log4j2/elasticsearch/Deserializer.java

@@ -0,0 +1,30 @@
+package org.appenders.log4j2.elasticsearch;
+
+/*-
+ * #%L
+ * log4j2-elasticsearch
+ * %%
+ * Copyright (C) 2022 Rafal Foltynski
+ * %%
+ * 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.
+ * #L%
+ */
+
+import java.io.IOException;
+import java.io.InputStream;
+
+public interface Deserializer<T> {
+
+    T read(InputStream inputStream) throws IOException;
+
+}

log4j2-elasticsearch-core/src/main/java/org/appenders/log4j2/elasticsearch/JacksonDeserializer.java

@@ -0,0 +1,41 @@
+package org.appenders.log4j2.elasticsearch;
+
+/*-
+ * #%L
+ * log4j2-elasticsearch
+ * %%
+ * Copyright (C) 2022 Rafal Foltynski
+ * %%
+ * 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.
+ * #L%
+ */
+
+import com.fasterxml.jackson.databind.ObjectReader;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+public class JacksonDeserializer<T> implements Deserializer<T> {
+
+    private final ObjectReader objectReader;
+
+    public JacksonDeserializer(final ObjectReader objectReader) {
+        this.objectReader = objectReader;
+    }
+
+    @Override
+    public T read(final InputStream inputStream) throws IOException {
+        return objectReader.readValue(inputStream);
+    }
+
+}

log4j2-elasticsearch-core/src/test/java/org/appenders/log4j2/elasticsearch/JacksonDeserializerTest.java

@@ -0,0 +1,55 @@
+package org.appenders.log4j2.elasticsearch;
+
+/*-
+ * #%L
+ * log4j2-elasticsearch
+ * %%
+ * Copyright (C) 2022 Rafal Foltynski
+ * %%
+ * 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.
+ * #L%
+ */
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.Test;
+
+import java.io.ByteArrayInputStream;
+import java.io.InputStream;
+import java.util.UUID;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class JacksonDeserializerTest {
+
+    @Test
+    public void readsInputStream() throws Exception {
+
+        // given
+        final Deserializer<JacksonSerializerTest.Dummy> deserializer = new JacksonDeserializer<>(
+                new ObjectMapper().readerFor(JacksonSerializerTest.Dummy.class));
+
+        final String expectedValue = UUID.randomUUID().toString();
+        final JacksonSerializerTest.Dummy dummy = new JacksonSerializerTest.Dummy(expectedValue);
+        final Serializer<JacksonSerializerTest.Dummy> serializer = new JacksonSerializer<>(new ObjectMapper().writerFor(JacksonSerializerTest.Dummy.class));
+        final byte[] bytes = serializer.writeAsBytes(dummy);
+        final InputStream inputStream = new ByteArrayInputStream(bytes);
+
+        // when
+        final JacksonSerializerTest.Dummy result = deserializer.read(inputStream);
+
+        // then
+        assertEquals(expectedValue, result.getExpectedContent());
+
+    }
+
+}