Java tutorial
/* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you 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.apache.tinkerpop.gremlin.driver.simple; import io.netty.buffer.PooledByteBufAllocator; import io.netty.channel.ChannelOption; import org.apache.tinkerpop.gremlin.driver.MessageSerializer; import org.apache.tinkerpop.gremlin.driver.handler.NioGremlinRequestEncoder; import org.apache.tinkerpop.gremlin.driver.handler.NioGremlinResponseDecoder; import org.apache.tinkerpop.gremlin.driver.message.RequestMessage; import org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0; import io.netty.bootstrap.Bootstrap; import io.netty.channel.Channel; import io.netty.channel.ChannelInitializer; import io.netty.channel.ChannelPipeline; import io.netty.channel.socket.SocketChannel; import io.netty.channel.socket.nio.NioSocketChannel; import java.io.IOException; import java.net.URI; /** * A simple, non-thread safe Gremlin Server client using NIO. Typical use is for testing and demonstration. * * @author Stephen Mallette (http://stephen.genoprime.com) */ public class NioClient extends AbstractClient { private final Channel channel; public NioClient() { this(URI.create("gs://localhost:8182")); } public NioClient(final URI uri) { super("nio-client-%d"); final Bootstrap b = new Bootstrap().group(group); b.option(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT); try { final MessageSerializer serializer = new GryoMessageSerializerV1d0(); b.channel(NioSocketChannel.class).handler(new ChannelInitializer<SocketChannel>() { @Override protected void initChannel(final SocketChannel ch) { final ChannelPipeline p = ch.pipeline(); p.addLast(new NioGremlinResponseDecoder(serializer), new NioGremlinRequestEncoder(true, serializer), callbackResponseHandler); } }); channel = b.connect(uri.getHost(), uri.getPort()).sync().channel(); } catch (Exception ex) { throw new RuntimeException(ex); } } @Override public void writeAndFlush(final RequestMessage requestMessage) throws Exception { channel.writeAndFlush(requestMessage).get(); } @Override public void close() throws IOException { try { channel.close().get(); } catch (Exception ignored) { } finally { group.shutdownGracefully().awaitUninterruptibly(); } } }