markap14 commented on a change in pull request #4669: URL: https://github.com/apache/nifi/pull/4669#discussion_r525225299
########## File path: nifi-nar-bundles/nifi-framework-bundle/nifi-stateless-bundle/nifi-stateless-bootstrap/src/main/java/org/apache/nifi/stateless/bootstrap/StatelessBootstrap.java ########## @@ -0,0 +1,149 @@ +/* + * 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.nifi.stateless.bootstrap; + +import org.apache.nifi.bundle.Bundle; +import org.apache.nifi.bundle.BundleCoordinate; +import org.apache.nifi.nar.NarUnpacker; +import org.apache.nifi.nar.SystemBundle; +import org.apache.nifi.stateless.config.ParameterOverride; +import org.apache.nifi.stateless.config.StatelessConfigurationException; +import org.apache.nifi.stateless.engine.StatelessEngineConfiguration; +import org.apache.nifi.stateless.flow.DataflowDefinition; +import org.apache.nifi.stateless.flow.DataflowDefinitionParser; +import org.apache.nifi.stateless.flow.StatelessDataflow; +import org.apache.nifi.stateless.flow.StatelessDataflowFactory; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.File; +import java.io.IOException; +import java.net.URL; +import java.net.URLClassLoader; +import java.nio.file.Path; +import java.util.ArrayList; +import java.util.Collections; +import java.util.List; +import java.util.ServiceLoader; +import java.util.function.Predicate; +import java.util.regex.Pattern; + +public class StatelessBootstrap { + private static final Logger logger = LoggerFactory.getLogger(StatelessBootstrap.class); + private static final Pattern STATELESS_NAR_PATTERN = Pattern.compile("nifi-stateless-nar-.*\\.nar-unpacked"); + private final ClassLoader statelessClassLoader; + private final StatelessEngineConfiguration engineConfiguration; + + private StatelessBootstrap(final ClassLoader statelessClassLoader, final StatelessEngineConfiguration engineConfiguration) { + this.statelessClassLoader = statelessClassLoader; + this.engineConfiguration = engineConfiguration; + } + + public <T> StatelessDataflow createDataflow(final DataflowDefinition<T> dataflowDefinition, final List<ParameterOverride> parameterOverrides) + throws IOException, StatelessConfigurationException { + final StatelessDataflowFactory<T> dataflowFactory = getSingleInstance(statelessClassLoader, StatelessDataflowFactory.class); + final StatelessDataflow dataflow = dataflowFactory.createDataflow(engineConfiguration, dataflowDefinition, parameterOverrides); + return dataflow; + } + + public DataflowDefinition<?> parseDataflowDefinition(final File flowDefinitionFile) throws StatelessConfigurationException, IOException { + final DataflowDefinitionParser dataflowDefinitionParser = getSingleInstance(statelessClassLoader, DataflowDefinitionParser.class); + final DataflowDefinition<?> dataflowDefinition = dataflowDefinitionParser.parseFlowDefinition(flowDefinitionFile, engineConfiguration); + return dataflowDefinition; + } + + public static StatelessBootstrap bootstrap(final StatelessEngineConfiguration engineConfiguration) throws IOException { + final File narDirectory = engineConfiguration.getNarDirectory(); + final File workingDirectory = engineConfiguration.getWorkingDirectory(); + + final Bundle systemBundle = SystemBundle.create(narDirectory.getAbsolutePath(), ClassLoader.getSystemClassLoader()); + final File frameworkWorkingDir = new File(workingDirectory, "nifi-framework"); + final File extensionsWorkingDir = new File(workingDirectory, "extensions"); + final File docsWorkingDir = new File(workingDirectory, "documentation"); + final List<Path> narDirectories = Collections.singletonList(narDirectory.toPath()); + + // Unpack NARs + final long unpackStart = System.currentTimeMillis(); + final Predicate<BundleCoordinate> narFilter = coordinate -> true; + NarUnpacker.unpackNars(systemBundle, frameworkWorkingDir, extensionsWorkingDir, docsWorkingDir, narDirectories, false, false, narFilter); + final long unpackMillis = System.currentTimeMillis() - unpackStart; + logger.info("Unpacked NAR's in {} millis", unpackMillis); Review comment: Fair enough. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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