| /* |
| * 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.sysds.utils; |
| |
| import org.apache.sysds.api.mlcontext.MLContext; |
| import org.apache.sysds.api.mlcontext.MLContextException; |
| import org.apache.sysds.parser.Expression; |
| |
| /** |
| * The purpose of this proxy is to shield systemds internals from direct access to MLContext |
| * which would try to load spark libraries and hence fail if these are not available. This |
| * indirection is much more efficient than catching NoClassDefFoundErrors for every access |
| * to MLContext (e.g., on each recompile). |
| * |
| */ |
| public class MLContextProxy |
| { |
| |
| private static boolean _active = false; |
| |
| public static void setActive(boolean flag) { |
| _active = flag; |
| } |
| |
| public static boolean isActive() { |
| return _active; |
| } |
| |
| public static void setAppropriateVarsForRead(Expression source, String targetname) { |
| MLContext.getActiveMLContext().getInternalProxy().setAppropriateVarsForRead(source, targetname); |
| } |
| |
| public static MLContext getActiveMLContext() { |
| return MLContext.getActiveMLContext(); |
| } |
| |
| public static MLContext getActiveMLContextForAPI() { |
| if (MLContext.getActiveMLContext() != null) { |
| return MLContext.getActiveMLContext(); |
| } |
| throw new MLContextException("No MLContext object is currently active. Have you created one? " |
| + "Hint: in Scala, 'val ml = new MLContext(sc)'", true); |
| } |
| } |