added benchmark tests for set and list performance

2018-08-03 10:32:50 +04:00
parent 7070f25400
commit 2fae078370
3 changed files with 93 additions and 9 deletions
@@ -0,0 +1,53 @@
+package com.baeldung.performance;
+
+import org.openjdk.jmh.annotations.*;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.TimeUnit;
+
+public class CollectionsBenchmark {
+
+    @State(Scope.Thread)
+    public static class MyState {
+        private Set<Employee> employeeSet = new HashSet<>();
+        private List<Employee> employeeList = new ArrayList<>();
+
+        private final long m_count = 16;
+
+        private Employee employee = new Employee(100L, "Harry");
+
+        @Setup(Level.Invocation)
+        public void setUp() {
+
+            for (long ii = 0; ii < m_count; ii++) {
+                employeeSet.add(new Employee(ii, "John"));
+                employeeList.add(new Employee(ii, "John"));
+
+                employeeList.add(employee);
+                employeeSet.add(employee);
+            }
+        }
+    }
+
+
+    @Benchmark
+    @BenchmarkMode(Mode.AverageTime)
+    @OutputTimeUnit(TimeUnit.MINUTES)
+    public boolean testArrayList(MyState state) {
+        return state.employeeList.contains(state.employee);
+    }
+
+    @Benchmark
+    @BenchmarkMode(Mode.AverageTime)
+    @OutputTimeUnit(TimeUnit.MINUTES)
+    public boolean testHashSet(MyState state) {
+        return state.employeeSet.contains(state.employee);
+    }
+
+    public static void main(String[] args) throws Exception {
+        org.openjdk.jmh.Main.main(args);
+    }
+}
@@ -0,0 +1,31 @@
+package com.baeldung.performance;
+
+public class Employee {
+
+    private Long id;
+    private String name;
+
+    public Employee(Long id, String name) {
+        this.name = name;
+        this.id = id;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        Employee employee = (Employee) o;
+
+        if (!id.equals(employee.id)) return false;
+        return name.equals(employee.name);
+
+    }
+
+    @Override
+    public int hashCode() {
+        int result = id.hashCode();
+        result = 31 * result + name.hashCode();
+        return result;
+    }
+}