/*
* 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.giraph.jython.factories;
import org.apache.giraph.conf.GiraphConfiguration;
import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration;
import org.apache.giraph.factories.ComputationFactory;
import org.apache.giraph.graph.Computation;
import org.apache.giraph.jython.JythonComputation;
import org.apache.giraph.jython.JythonGiraphComputation;
import org.apache.giraph.jython.JythonOptions;
import org.apache.giraph.jython.JythonUtils;
import org.apache.giraph.scripting.ScriptLoader;
import org.apache.log4j.Logger;
import org.python.core.PyObject;
import org.python.util.PythonInterpreter;
import static com.google.common.base.Preconditions.checkNotNull;
import static org.apache.giraph.scripting.ScriptLoader.SCRIPTS_TO_LOAD;
/**
* Factory for creating Jython Computation from python scripts
*/
public class JythonComputationFactory implements ComputationFactory {
/** The Jython compute function, cached here for fast access */
private static volatile PyObject JYTHON_COMPUTATION_MODULE;
/** Logger */
private static final Logger LOG = Logger.getLogger(JythonUtils.class);
/**
* Set static python computation module stored
*
* @param mod python computation module
*/
private static void setPythonComputationModule(PyObject mod) {
JYTHON_COMPUTATION_MODULE = mod;
}
/**
* Get python computation module stored
*
* @return python computation module
*/
private static PyObject getPythonComputationModule() {
return JYTHON_COMPUTATION_MODULE;
}
@Override
public void initialize(ImmutableClassesGiraphConfiguration conf) {
PythonInterpreter interpreter = JythonUtils.getInterpreter();
String className = computationName(conf);
PyObject pyComputationModule = interpreter.get(className);
checkNotNull(pyComputationModule,
"Could not find Jython Computation class " + className +
" in loaded scripts: " + ScriptLoader.getLoadedScripts());
setPythonComputationModule(pyComputationModule);
}
@Override
public Computation createComputation(
ImmutableClassesGiraphConfiguration conf) {
checkNotNull(JYTHON_COMPUTATION_MODULE,
"Jython Computation class not set in loaded scripts: " +
ScriptLoader.getLoadedScripts());
PyObject pyComputationObj = JYTHON_COMPUTATION_MODULE.__call__();
Object computeObj = pyComputationObj.__tojava__(JythonComputation.class);
if (!(computeObj instanceof JythonComputation)) {
throw new IllegalStateException("getComputation: Jython object " +
computationName(conf) + " is not a JythonComputation");
}
JythonComputation jythonCompute = (JythonComputation) computeObj;
conf.configureIfPossible(jythonCompute);
JythonGiraphComputation giraphCompute =
new JythonGiraphComputation(jythonCompute);
giraphCompute.setConf(conf);
jythonCompute.setGiraphCompute(giraphCompute);
return giraphCompute;
}
@Override
public void checkConfiguration(ImmutableClassesGiraphConfiguration conf) {
if (SCRIPTS_TO_LOAD.isDefaultValue(conf)) {
throw new IllegalStateException("checkConfiguration: " +
SCRIPTS_TO_LOAD.getKey() + " not set in configuration");
}
if (!JythonOptions.JYTHON_COMPUTATION_CLASS_NAME.contains(conf)) {
throw new IllegalStateException("checkConfiguration: " +
JythonOptions.JYTHON_COMPUTATION_CLASS_NAME.getKey() +
" not set in configuration");
}
}
@Override
public String computationName(GiraphConfiguration conf) {
return JythonOptions.JYTHON_COMPUTATION_CLASS_NAME.get(conf);
}
}