| /* |
| * 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.process.remote; |
| |
| import org.apache.commons.configuration.Configuration; |
| import org.apache.tinkerpop.gremlin.process.remote.traversal.RemoteTraversal; |
| import org.apache.tinkerpop.gremlin.process.traversal.Bytecode; |
| import org.apache.tinkerpop.gremlin.process.traversal.Traversal; |
| import org.apache.tinkerpop.gremlin.process.traversal.Traverser; |
| |
| import java.lang.reflect.Constructor; |
| import java.util.Iterator; |
| import java.util.concurrent.CompletableFuture; |
| |
| /** |
| * A simple abstraction of a "connection" to a "server" that is capable of processing a {@link Traversal} and |
| * returning results. Results refer to both the {@link Iterator} of results from the submitted {@link Traversal} |
| * as well as the side-effects produced by that {@link Traversal}. Those results together are wrapped in a |
| * {@link Traversal}. |
| * |
| * @author Stephen Mallette (http://stephen.genoprime.com) |
| * @author Marko A. Rodriguez (http://markorodriguez.com) |
| */ |
| public interface RemoteConnection extends AutoCloseable { |
| |
| public static final String GREMLIN_REMOTE = "gremlin.remote."; |
| public static final String GREMLIN_REMOTE_CONNECTION_CLASS = GREMLIN_REMOTE + "remoteConnectionClass"; |
| |
| /** |
| * @deprecated As of release 3.2.2, replaced by {@link #submitAsync(Bytecode)}. |
| */ |
| @Deprecated |
| public <E> Iterator<Traverser.Admin<E>> submit(final Traversal<?, E> traversal) throws RemoteConnectionException; |
| |
| /** |
| * Submits {@link Traversal} {@link Bytecode} to a server and returns a {@link RemoteTraversal}. |
| * The {@link RemoteTraversal} is an abstraction over two types of results that can be returned as part of the |
| * response from the server: the results of the {@link Traversal} itself and the side-effects that it produced. |
| * |
| * @deprecated As of release 3.2.4, replaced by {@link #submitAsync(Bytecode)}. |
| */ |
| @Deprecated |
| public <E> RemoteTraversal<?,E> submit(final Bytecode bytecode) throws RemoteConnectionException; |
| |
| /** |
| * Submits {@link Traversal} {@link Bytecode} to a server and returns a promise of a {@link RemoteTraversal}. |
| * The {@link RemoteTraversal} is an abstraction over two types of results that can be returned as part of the |
| * response from the server: the results of the {@link Traversal} itself and the side-effects that it produced. |
| * <p/> |
| * The default implementation calls the {@link #submit(Bytecode)} method for backward compatibility, but generally |
| * speaking this method should be implemented directly as {@link #submit(Bytecode)} is not called directly by |
| * any part of TinkerPop. Even if the {@code RemoteConnection} itself is not capable of asynchronous behaviour, it |
| * should simply implement this method in a blocking form. |
| */ |
| public default <E> CompletableFuture<RemoteTraversal<?, E>> submitAsync(final Bytecode bytecode) throws RemoteConnectionException { |
| // default implementation for backward compatibility to 3.2.4 - this method will probably just become |
| // the new submit() in 3.3.x when the deprecation is removed |
| final CompletableFuture<RemoteTraversal<?, E>> promise = new CompletableFuture<>(); |
| try { |
| promise.complete(submit(bytecode)); |
| } catch (Exception t) { |
| promise.completeExceptionally(t); |
| } |
| return promise; |
| } |
| |
| /** |
| * Create a {@link RemoteConnection} from a {@code Configuration} object. The configuration must contain a |
| * {@code gremlin.remote.remoteConnectionClass} key which is the fully qualified class name of a |
| * {@link RemoteConnection} class. |
| */ |
| public static RemoteConnection from(final Configuration conf) { |
| if (!conf.containsKey(RemoteConnection.GREMLIN_REMOTE_CONNECTION_CLASS)) |
| throw new IllegalArgumentException("Configuration must contain the '" + GREMLIN_REMOTE_CONNECTION_CLASS + "' key"); |
| |
| try { |
| final Class<? extends RemoteConnection> clazz = Class.forName( |
| conf.getString(GREMLIN_REMOTE_CONNECTION_CLASS)).asSubclass(RemoteConnection.class); |
| final Constructor<? extends RemoteConnection> ctor = clazz.getConstructor(Configuration.class); |
| return ctor.newInstance(conf); |
| } catch (Exception ex) { |
| throw new IllegalStateException(ex); |
| } |
| } |
| } |