Add PoolStatus.size() helper as convenience for free + busy

ebean-datasource-api/src/main/java/io/ebean/datasource/PoolStatus.java

@@ -25,6 +25,11 @@ public interface PoolStatus {
    */
   int busy();
 
+  /**
+   * Return total number of free + busy connections in the pool.
+   */
+  int size();
+
   /**
    * Return the number of threads waiting for connections.
    */

ebean-datasource/src/main/java/io/ebean/datasource/pool/ConnectionPool.java

@@ -934,6 +934,11 @@ public int busy() {
       return busy;
     }
 
+    @Override
+    public int size() {
+      return free + busy;
+    }
+
     @Override
     public int waiting() {
       return waiting;

ebean-datasource/src/test/java/io/ebean/datasource/pool/ConnectionPoolTest.java

@@ -78,6 +78,42 @@ void getConnection_expect_poolGrowsAboveMin() throws SQLException {
     assertThat(status.maxSize()).isEqualTo(4);
   }
 
+  @Test
+  void status_size_isBusyPlusFree() throws SQLException {
+    PoolStatus initial = pool.status(false);
+    assertThat(initial.size()).isEqualTo(initial.busy() + initial.free());
+
+    Connection con1 = pool.getConnection();
+    Connection con2 = pool.getConnection();
+    Connection con3 = pool.getConnection();
+
+    PoolStatus allBusy = pool.status(false);
+    assertThat(allBusy.busy()).isEqualTo(3);
+    assertThat(allBusy.free()).isEqualTo(0);
+    assertThat(allBusy.size()).isEqualTo(3);
+    assertThat(allBusy.size()).isEqualTo(allBusy.busy() + allBusy.free());
+
+    con2.rollback();
+    con2.close();
+
+    PoolStatus mixed = pool.status(false);
+    assertThat(mixed.busy()).isEqualTo(2);
+    assertThat(mixed.free()).isEqualTo(1);
+    assertThat(mixed.size()).isEqualTo(3);
+    assertThat(mixed.size()).isEqualTo(mixed.busy() + mixed.free());
+
+    con1.rollback();
+    con1.close();
+    con3.rollback();
+    con3.close();
+
+    PoolStatus allFree = pool.status(false);
+    assertThat(allFree.busy()).isEqualTo(0);
+    assertThat(allFree.free()).isEqualTo(3);
+    assertThat(allFree.size()).isEqualTo(3);
+    assertThat(allFree.size()).isEqualTo(allFree.busy() + allFree.free());
+  }
+
   @Test
   void getConnection_explicitUserPassword() throws SQLException {
     Connection connection = pool.getConnection("sa", "");