ready for performance test

demo/pom.xml

@@ -25,6 +25,11 @@
             <artifactId>contiguous-jdbc</artifactId>
             <version>1.0-SNAPSHOT</version>
         </dependency>
+        <dependency>
+            <groupId>nl.sanderhautvast</groupId>
+            <artifactId>contiguous-jackson</artifactId>
+            <version>1.0-SNAPSHOT</version>
+        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>

demo/src/main/java/nl/sanderhautvast/contiguous/demo/DemoApplication.java

@@ -1,6 +1,9 @@
 package nl.sanderhautvast.contiguous.demo;
 
+import com.fasterxml.jackson.databind.Module;
+import com.fasterxml.jackson.databind.module.SimpleModule;
 import lombok.extern.slf4j.Slf4j;
+import nl.sanderhautvast.contiguous.ListSerializer;
 import nl.sanderhautvast.contiguous.demo.repository.RandomStuffGenerator;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.CommandLineRunner;
@@ -40,7 +43,7 @@ public class DemoApplication {
             jdbcTemplate.execute("drop table if exists customers");
             jdbcTemplate.execute("create table customers (name varchar(100), email varchar(100), streetname varchar(100), housenumber integer, city varchar(100), country varchar(100))");
             final RandomStuffGenerator generator = new RandomStuffGenerator();
-            for (int i = 0; i < 100_000; i++) {
+            for (int i = 0; i < 10_000; i++) {
                 jdbcTemplate.update("insert into customers (name, email, streetname, housenumber, city, country) values(?,?,?,?,?,?)",
                         ps -> {
                             String firstName = generator.generateFirstName();
@@ -57,6 +60,14 @@ public class DemoApplication {
         };
     }
 
+    @Bean
+    public Module jacksonModule() {
+        final SimpleModule module = new SimpleModule("contiguous_module");
+        module.addSerializer(new ListSerializer());
+        return module;
+    }
+
+
     @Bean
     public JdbcTemplate jdbcTemplate() {
         return new JdbcTemplate(datasource());

demo/src/main/java/nl/sanderhautvast/contiguous/demo/model/Customer.java

@@ -1,10 +1,14 @@
 package nl.sanderhautvast.contiguous.demo.model;
 
+import lombok.AllArgsConstructor;
 import lombok.Builder;
 import lombok.Data;
+import lombok.NoArgsConstructor;
 
 @Data
 @Builder
+@NoArgsConstructor
+@AllArgsConstructor
 public class Customer {
     String name;
     String email;

demo/src/main/java/nl/sanderhautvast/contiguous/demo/repository/CustomerRepository.java

@@ -9,6 +9,8 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.jdbc.core.JdbcTemplate;
 import org.springframework.stereotype.Repository;
 
+import java.util.List;
+
 @Repository
 @Slf4j
 public class CustomerRepository {
@@ -21,7 +23,21 @@ public class CustomerRepository {
     }
 
     public ContiguousList<Customer> getAllCustomers() {
-        return jdbcTemplate.query("select * from customers limit 5", rs -> {
+        return jdbcTemplate.query("select * from customers limit 10000", rs -> {
+            return JdbcResults.toList(rs, Customer.class);
+        });
+    }
+
+    public List<Customer> getAllCustomersTraditional() {
+        return jdbcTemplate.query("select * from customers", (rs, rowNum) -> new Customer(
+                rs.getString("name"),rs.getString("email"),
+                rs.getString("streetname"), rs.getInt("housenumber"),
+                rs.getString("city"), rs.getString("country")
+        ));
+    }
+
+    public List<Customer> getAllCustomersHybrid() {
+        return jdbcTemplate.query("select * from customers", rs -> {
             return JdbcResults.toList(rs, Customer.class);
         });
     }

demo/src/main/java/nl/sanderhautvast/contiguous/demo/rest/DemoRestApi.java

@@ -22,14 +22,17 @@ public class DemoRestApi {
     }
 
     @GetMapping(value = "/api/customers", produces = "application/json")
-    public List<Customer> getCustomers()  {
-        try {
-            ContiguousList<Customer> customers = customerRepository.getAllCustomers();
-            log.info("customers {}", customers.size());
-            return customers;
-        } catch (Exception e) {
-            log.error("Error", e);
-            throw new RuntimeException(e);
-        }
+    public ContiguousList<Customer> getCustomers() {
+        return customerRepository.getAllCustomers();
+    }
+
+    @GetMapping(value = "/api/customers/traditional", produces = "application/json")
+    public List<Customer> getCustomersTraditional() {
+        return customerRepository.getAllCustomersTraditional();
+    }
+
+    @GetMapping(value = "/api/customers/hybrid", produces = "application/json")
+    public List<Customer> getCustomersHybrid() {
+        return customerRepository.getAllCustomersHybrid();
     }
 }

demo/src/main/resources/application.properties

@@ -1,4 +1,3 @@
-logging.level.org.springframework=ERROR
 spring.jpa.hibernate.ddl-auto=none
 spring.datasource.driverClass=org.postgresql.Driver
 spring.datasource.url=jdbc:postgresql://localhost:5432/postgres

jmeter-test.jmx

@@ -0,0 +1,163 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<jmeterTestPlan version="1.2" properties="5.0" jmeter="5.5">
+  <hashTree>
+    <TestPlan guiclass="TestPlanGui" testclass="TestPlan" testname="Test Plan" enabled="true">
+      <stringProp name="TestPlan.comments"></stringProp>
+      <boolProp name="TestPlan.functional_mode">false</boolProp>
+      <boolProp name="TestPlan.tearDown_on_shutdown">true</boolProp>
+      <boolProp name="TestPlan.serialize_threadgroups">false</boolProp>
+      <elementProp name="TestPlan.user_defined_variables" elementType="Arguments" guiclass="ArgumentsPanel" testclass="Arguments" testname="User Defined Variables" enabled="true">
+        <collectionProp name="Arguments.arguments"/>
+      </elementProp>
+      <stringProp name="TestPlan.user_define_classpath"></stringProp>
+    </TestPlan>
+    <hashTree>
+      <ThreadGroup guiclass="ThreadGroupGui" testclass="ThreadGroup" testname="Thread Group" enabled="true">
+        <stringProp name="ThreadGroup.on_sample_error">continue</stringProp>
+        <elementProp name="ThreadGroup.main_controller" elementType="LoopController" guiclass="LoopControlPanel" testclass="LoopController" testname="Loop Controller" enabled="true">
+          <boolProp name="LoopController.continue_forever">false</boolProp>
+          <stringProp name="LoopController.loops">100</stringProp>
+        </elementProp>
+        <stringProp name="ThreadGroup.num_threads">1</stringProp>
+        <stringProp name="ThreadGroup.ramp_time">1</stringProp>
+        <boolProp name="ThreadGroup.scheduler">false</boolProp>
+        <stringProp name="ThreadGroup.duration"></stringProp>
+        <stringProp name="ThreadGroup.delay"></stringProp>
+        <boolProp name="ThreadGroup.same_user_on_next_iteration">true</boolProp>
+      </ThreadGroup>
+      <hashTree>
+        <HTTPSamplerProxy guiclass="HttpTestSampleGui" testclass="HTTPSamplerProxy" testname="contiguous" enabled="false">
+          <elementProp name="HTTPsampler.Arguments" elementType="Arguments" guiclass="HTTPArgumentsPanel" testclass="Arguments" testname="User Defined Variables" enabled="true">
+            <collectionProp name="Arguments.arguments"/>
+          </elementProp>
+          <stringProp name="HTTPSampler.domain">localhost</stringProp>
+          <stringProp name="HTTPSampler.port">8080</stringProp>
+          <stringProp name="HTTPSampler.protocol">http</stringProp>
+          <stringProp name="HTTPSampler.contentEncoding"></stringProp>
+          <stringProp name="HTTPSampler.path">/api/customers</stringProp>
+          <stringProp name="HTTPSampler.method">GET</stringProp>
+          <boolProp name="HTTPSampler.follow_redirects">true</boolProp>
+          <boolProp name="HTTPSampler.auto_redirects">false</boolProp>
+          <boolProp name="HTTPSampler.use_keepalive">true</boolProp>
+          <boolProp name="HTTPSampler.DO_MULTIPART_POST">false</boolProp>
+          <stringProp name="HTTPSampler.embedded_url_re"></stringProp>
+          <stringProp name="HTTPSampler.connect_timeout"></stringProp>
+          <stringProp name="HTTPSampler.response_timeout"></stringProp>
+        </HTTPSamplerProxy>
+        <hashTree/>
+        <HTTPSamplerProxy guiclass="HttpTestSampleGui" testclass="HTTPSamplerProxy" testname="traditional" enabled="true">
+          <elementProp name="HTTPsampler.Arguments" elementType="Arguments" guiclass="HTTPArgumentsPanel" testclass="Arguments" testname="User Defined Variables" enabled="true">
+            <collectionProp name="Arguments.arguments"/>
+          </elementProp>
+          <stringProp name="HTTPSampler.domain">localhost</stringProp>
+          <stringProp name="HTTPSampler.port">8080</stringProp>
+          <stringProp name="HTTPSampler.protocol">http</stringProp>
+          <stringProp name="HTTPSampler.contentEncoding"></stringProp>
+          <stringProp name="HTTPSampler.path">api/customers/traditional</stringProp>
+          <stringProp name="HTTPSampler.method">GET</stringProp>
+          <boolProp name="HTTPSampler.follow_redirects">true</boolProp>
+          <boolProp name="HTTPSampler.auto_redirects">false</boolProp>
+          <boolProp name="HTTPSampler.use_keepalive">true</boolProp>
+          <boolProp name="HTTPSampler.DO_MULTIPART_POST">false</boolProp>
+          <stringProp name="HTTPSampler.embedded_url_re"></stringProp>
+          <stringProp name="HTTPSampler.connect_timeout"></stringProp>
+          <stringProp name="HTTPSampler.response_timeout"></stringProp>
+        </HTTPSamplerProxy>
+        <hashTree/>
+        <HTTPSamplerProxy guiclass="HttpTestSampleGui" testclass="HTTPSamplerProxy" testname="hybrid" enabled="false">
+          <elementProp name="HTTPsampler.Arguments" elementType="Arguments" guiclass="HTTPArgumentsPanel" testclass="Arguments" testname="User Defined Variables" enabled="true">
+            <collectionProp name="Arguments.arguments"/>
+          </elementProp>
+          <stringProp name="HTTPSampler.domain">localhost</stringProp>
+          <stringProp name="HTTPSampler.port">8080</stringProp>
+          <stringProp name="HTTPSampler.protocol">http</stringProp>
+          <stringProp name="HTTPSampler.contentEncoding"></stringProp>
+          <stringProp name="HTTPSampler.path">api/customers/hybrid</stringProp>
+          <stringProp name="HTTPSampler.method">GET</stringProp>
+          <boolProp name="HTTPSampler.follow_redirects">true</boolProp>
+          <boolProp name="HTTPSampler.auto_redirects">false</boolProp>
+          <boolProp name="HTTPSampler.use_keepalive">true</boolProp>
+          <boolProp name="HTTPSampler.DO_MULTIPART_POST">false</boolProp>
+          <stringProp name="HTTPSampler.embedded_url_re"></stringProp>
+          <stringProp name="HTTPSampler.connect_timeout"></stringProp>
+          <stringProp name="HTTPSampler.response_timeout"></stringProp>
+        </HTTPSamplerProxy>
+        <hashTree/>
+      </hashTree>
+      <ResultCollector guiclass="StatVisualizer" testclass="ResultCollector" testname="Aggregate Report" enabled="true">
+        <boolProp name="ResultCollector.error_logging">false</boolProp>
+        <objProp>
+          <name>saveConfig</name>
+          <value class="SampleSaveConfiguration">
+            <time>true</time>
+            <latency>true</latency>
+            <timestamp>true</timestamp>
+            <success>true</success>
+            <label>true</label>
+            <code>true</code>
+            <message>true</message>
+            <threadName>true</threadName>
+            <dataType>true</dataType>
+            <encoding>false</encoding>
+            <assertions>true</assertions>
+            <subresults>true</subresults>
+            <responseData>false</responseData>
+            <samplerData>false</samplerData>
+            <xml>false</xml>
+            <fieldNames>true</fieldNames>
+            <responseHeaders>false</responseHeaders>
+            <requestHeaders>false</requestHeaders>
+            <responseDataOnError>false</responseDataOnError>
+            <saveAssertionResultsFailureMessage>true</saveAssertionResultsFailureMessage>
+            <assertionsResultsToSave>0</assertionsResultsToSave>
+            <bytes>true</bytes>
+            <sentBytes>true</sentBytes>
+            <url>true</url>
+            <threadCounts>true</threadCounts>
+            <idleTime>true</idleTime>
+            <connectTime>true</connectTime>
+          </value>
+        </objProp>
+        <stringProp name="filename"></stringProp>
+      </ResultCollector>
+      <hashTree/>
+      <ResultCollector guiclass="ViewResultsFullVisualizer" testclass="ResultCollector" testname="View Results Tree" enabled="false">
+        <boolProp name="ResultCollector.error_logging">false</boolProp>
+        <objProp>
+          <name>saveConfig</name>
+          <value class="SampleSaveConfiguration">
+            <time>true</time>
+            <latency>true</latency>
+            <timestamp>true</timestamp>
+            <success>true</success>
+            <label>true</label>
+            <code>true</code>
+            <message>true</message>
+            <threadName>true</threadName>
+            <dataType>true</dataType>
+            <encoding>false</encoding>
+            <assertions>true</assertions>
+            <subresults>true</subresults>
+            <responseData>false</responseData>
+            <samplerData>false</samplerData>
+            <xml>false</xml>
+            <fieldNames>true</fieldNames>
+            <responseHeaders>false</responseHeaders>
+            <requestHeaders>false</requestHeaders>
+            <responseDataOnError>false</responseDataOnError>
+            <saveAssertionResultsFailureMessage>true</saveAssertionResultsFailureMessage>
+            <assertionsResultsToSave>0</assertionsResultsToSave>
+            <bytes>true</bytes>
+            <sentBytes>true</sentBytes>
+            <url>true</url>
+            <threadCounts>true</threadCounts>
+            <idleTime>true</idleTime>
+            <connectTime>true</connectTime>
+          </value>
+        </objProp>
+        <stringProp name="filename"></stringProp>
+      </ResultCollector>
+      <hashTree/>
+    </hashTree>
+  </hashTree>
+</jmeterTestPlan>

lib/src/main/java/nl/sanderhautvast/contiguous/ContiguousList.java

@@ -56,11 +56,11 @@ public class ContiguousList<E> extends NotImplementedList<E> implements List<E>
     /*
      * storage for dehydated objects
      */
-    private ByteBuffer data = ByteBuffer.allocate(32);
+    private ByteBuffer data = ByteBuffer.allocate(4096);//TODO create constructor with capacity
 
     private int bufferPosition;
 
-    private int[] elementIndices = new int[10]; // avoids autoboxing. Could also use standard ArrayList though
+    private ArrayList<Integer> elementIndices = new ArrayList<>(); // avoids autoboxing. Could also use standard ArrayList though
     // is there a standard lib IntList??
 
     private int size;
@@ -69,11 +69,7 @@ public class ContiguousList<E> extends NotImplementedList<E> implements List<E>
 
     public ContiguousList(Class<E> type) {
         inspectType(type);
-        elementIndices[0] = 0; // index of first element
-    }
-
-    public Class<?> getElementType() {
-        return rootHandler.getType();
+        elementIndices.add(0); // index of first element
     }
 
     /*
@@ -136,13 +132,7 @@ public class ContiguousList<E> extends NotImplementedList<E> implements List<E>
             return false;
         }
         storePropertyData(element, rootHandler);
-        size += 1;
-
-        // keep track of where the objects are stored
-        if (elementIndices.length < size + 1) {
-            this.elementIndices = Arrays.copyOf(this.elementIndices, this.elementIndices.length * 2);
-        }
-        elementIndices[size] = bufferPosition;
+        extend();
         return true;
     }
 
@@ -189,7 +179,7 @@ public class ContiguousList<E> extends NotImplementedList<E> implements List<E>
         if (index < 0 || index >= size) {
             throw new IndexOutOfBoundsException("index <0 or >" + size);
         }
-        data.position(elementIndices[index]);
+        data.position(elementIndices.get(index));
         try {
             if (rootHandler instanceof BuiltinTypeHandler<?>) {
                 Object read = ValueReader.read(data);
@@ -278,14 +268,14 @@ public class ContiguousList<E> extends NotImplementedList<E> implements List<E>
         if (index < 0 || index >= size) {
             throw new IndexOutOfBoundsException("index <0 or >" + size);
         }
-        data.position(elementIndices[index]);
+        data.position(elementIndices.get(index));
         if (rootHandler instanceof BuiltinTypeHandler<?>) {
 
             BuiltinTypeHandler<?> handler = (BuiltinTypeHandler<?>) rootHandler;
             return getValue(handler);
         }
         // create a new instance of the list element type
-        StringBuilder s = new StringBuilder();
+        StringBuilder s = new StringBuilder(300);
         s.append("{");
         copyDataIntoStringBuilder(s, (CompoundTypeHandler) rootHandler);
         s.append("}");
@@ -303,7 +293,7 @@ public class ContiguousList<E> extends NotImplementedList<E> implements List<E>
     }
 
     private static String quote(String out) {
-        StringBuilder s = new StringBuilder();
+        StringBuilder s = new StringBuilder(out.length() + 2);
         out = s.append("\"").append(out).append("\"").toString();
         return out;
     }
@@ -315,9 +305,9 @@ public class ContiguousList<E> extends NotImplementedList<E> implements List<E>
         compoundType.getProperties().forEach(property -> {
             if (property instanceof BuiltinTypeHandler) {
                 BuiltinTypeHandler<?> typeHandler = (BuiltinTypeHandler<?>) property;
-                String name = typeHandler.getName();
-                String value = getValue(typeHandler);
-                s.append(quote(name)).append(": ").append(value);
+                s.append(quote(typeHandler.getName()))
+                        .append(": ")
+                        .append(getValue(typeHandler));
             } else {
                 CompoundTypeHandler p = (CompoundTypeHandler) property;
                 s.append(p.getName()).append(":{");
@@ -608,16 +598,14 @@ public class ContiguousList<E> extends NotImplementedList<E> implements List<E>
     // used by SetterIterator
     void extend() {
         size += 1;
+        // keep track of index of element in data
+        elementIndices.add(bufferPosition);
     }
 
     byte[] getData() {
         return Arrays.copyOfRange(data.array(), 0, bufferPosition);
     }
 
-    int[] getElementIndices() {
-        return Arrays.copyOfRange(elementIndices, 0, size + 1);
-    }
-
     private void ensureFree(int length) {
         while (bufferPosition + length > data.capacity()) {
             byte[] bytes = this.data.array();