Add custom resolver example

Author: ali-ince

examples/src/main/java/org/neo4j/docs/driver/ConfigCustomResolverExample.java

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+/*
+ * Copyright (c) 2002-2018 "Neo4j,"
+ * Neo4j Sweden AB [http://neo4j.com]
+ *
+ * This file is part of Neo4j.
+ *
+ * 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.
+ */
+package org.neo4j.docs.driver;
+
+import java.util.Arrays;
+import java.util.HashSet;
+
+import org.neo4j.driver.v1.AccessMode;
+import org.neo4j.driver.v1.AuthTokens;
+import org.neo4j.driver.v1.Config;
+import org.neo4j.driver.v1.Driver;
+import org.neo4j.driver.v1.GraphDatabase;
+import org.neo4j.driver.v1.Session;
+import org.neo4j.driver.v1.StatementResult;
+import org.neo4j.driver.v1.net.ServerAddress;
+
+import static org.neo4j.driver.v1.Values.parameters;
+
+public class ConfigCustomResolverExample implements AutoCloseable
+{
+    private final Driver driver;
+
+    public ConfigCustomResolverExample( String virtualUri, String user, String password, ServerAddress[] addresses )
+    {
+        driver = createDriver( virtualUri, user, password, addresses );
+    }
+
+    // tag::config-custom-resolver[]
+    private Driver createDriver( String virtualUri, String user, String password, ServerAddress... addresses )
+    {
+        return GraphDatabase.driver( virtualUri, AuthTokens.basic( user, password ),
+                Config.build().withResolver( address -> new HashSet<>( Arrays.asList( addresses ) ) ).toConfig() );
+    }
+
+    private void addPerson( String name )
+    {
+        String username = "neo4j";
+        String password = "some password";
+
+        try ( Driver driver = createDriver( "bolt+routing://x.acme.com", username, password, ServerAddress.of( "a.acme.com", 7676 ),
+                ServerAddress.of( "b.acme.com", 8787 ), ServerAddress.of( "c.acme.com", 9898 ) ) )
+        {
+            try ( Session session = driver.session( AccessMode.WRITE ) )
+            {
+                session.run( "CREATE (a:Person {name: $name})", parameters( "name", name ) );
+            }
+        }
+    }
+    // end::config-custom-resolver[]
+
+    @Override
+    public void close() throws Exception
+    {
+        driver.close();
+    }
+
+    public boolean canConnect()
+    {
+        StatementResult result = driver.session().run( "RETURN 1" );
+        return result.single().get( 0 ).asInt() == 1;
+    }
+}

examples/src/test/java/org/neo4j/docs/driver/ExamplesClusterIT.java

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+/*
+ * Copyright (c) 2002-2018 "Neo4j,"
+ * Neo4j Sweden AB [http://neo4j.com]
+ *
+ * This file is part of Neo4j.
+ *
+ * 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.
+ */
+package org.neo4j.docs.driver;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+import org.neo4j.driver.v1.net.ServerAddress;
+import org.neo4j.driver.v1.util.cc.Cluster;
+import org.neo4j.driver.v1.util.cc.ClusterExtension;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.neo4j.driver.v1.util.Neo4jRunner.PASSWORD;
+import static org.neo4j.driver.v1.util.Neo4jRunner.USER;
+
+class ExamplesClusterIT
+{
+    @RegisterExtension
+    static final ClusterExtension neo4j = new ClusterExtension();
+
+    @Test
+    void testShouldRunConfigCustomResolverExample() throws Exception
+    {
+        Cluster cluster = neo4j.getCluster();
+
+        // Given
+        try ( ConfigCustomResolverExample example = new ConfigCustomResolverExample( "bolt+routing://x.acme.com", USER, PASSWORD,
+                cluster.cores().stream().map( c -> c.getBoltAddress() ).toArray( i -> new ServerAddress[i] ) ) )
+        {
+            // Then
+            assertTrue( example.canConnect() );
+        }
+    }
+}