Java tutorial
package com.thinkbiganalytics.nifi.rest.support; /*- * #%L * thinkbig-nifi-rest-common-util * %% * Copyright (C) 2017 ThinkBig Analytics * %% * Licensed 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. * #L% */ import com.google.common.base.Predicate; import com.google.common.collect.Iterables; import com.google.common.collect.Lists; import org.apache.nifi.web.api.dto.ProcessGroupDTO; import org.apache.nifi.web.api.dto.ProcessorDTO; import org.apache.nifi.web.api.dto.TemplateDTO; import java.util.ArrayList; import java.util.Collection; import java.util.HashMap; import java.util.HashSet; import java.util.List; import java.util.Map; import java.util.Set; import java.util.regex.Pattern; import java.util.stream.Collectors; import javax.annotation.Nonnull; import javax.annotation.Nullable; /** * Utility class to gather Processor information from NiFi dto objects */ public class NifiProcessUtil { /** * Type of the cleanup processor */ public static String CLEANUP_TYPE = "com.thinkbiganalytics.nifi.v2.metadata.TriggerCleanup"; public static String TRIGGER_FEED_TYPE = "com.thinkbiganalytics.nifi.v2.metadata.TriggerFeed"; /** * Return processors matching a supplied processor type matching {@link ProcessorDTO#getType()} against the supplied {@code type} * * @param processors a collection of processors * @param type a type to match against * @return a list of processors that are of the supplied type */ public static List<ProcessorDTO> findProcessorsByType(Collection<ProcessorDTO> processors, String type) { Predicate<ProcessorDTO> byType = new ProcessorByTypePredicate(type); return Lists.newArrayList(Iterables.filter(processors, byType)); } /** * Return the first processor that matches a supplied type {@link ProcessorDTO#getType()} * * @param processors a collection of processors * @param type a processor type * @return the first processor in the collection matching the supplied type, or null if not found */ public static ProcessorDTO findFirstProcessorsByType(Collection<ProcessorDTO> processors, String type) { if (type != null) { List<ProcessorDTO> list = findProcessorsByType(processors, type); if (list != null && !list.isEmpty()) { return list.get(0); } } return null; } /** * Return the list of processors that match a given name * * @param processors a collection of processors * @param name a name to match * @return a list of processors with the supplied name */ public static List<ProcessorDTO> findProcessorsByName(Collection<ProcessorDTO> processors, String name) { Predicate<ProcessorDTO> byName = new ProcessorByNamePredicate(name); return Lists.newArrayList(Iterables.filter(processors, byName)); } /** * Return the first processor in the collection with the supplied name * * @param processors a collection of processors * @param name the name to match * @return a processor with the name, or null if not found */ public static ProcessorDTO findFirstProcessorsByName(Collection<ProcessorDTO> processors, String name) { List<ProcessorDTO> list = findProcessorsByName(processors, name); if (list != null && !list.isEmpty()) { return list.get(0); } return null; } /** * Return a list of processors matching a given id * * @param processors a collection of processors * @param id an id to match * @return a list of processors with the supplied id */ public static List<ProcessorDTO> findProcessorsById(Collection<ProcessorDTO> processors, String id) { Predicate<ProcessorDTO> byId = new ProcessorByIdPredicate(id); return Lists.newArrayList(Iterables.filter(processors, byId)); } /** * Return the first processor in the collection that matches the supplied id * * @param processors a collection of processors * @param id an id to match * @return the first processor in the collection matching the id */ public static ProcessorDTO findFirstProcessorsById(Collection<ProcessorDTO> processors, String id) { List<ProcessorDTO> list = findProcessorsById(processors, id); if (list != null && !list.isEmpty()) { return list.get(0); } return null; } /** * Return processors matching a list of ids * * @param processors a collection of processors * @param ids a list of ids to match * @return a list of processors that have an id in the supplied {@code ids} list */ public static List<ProcessorDTO> findProcessorsByIds(Collection<ProcessorDTO> processors, List<String> ids) { Predicate<ProcessorDTO> byIds = new ProcessorByIdsPredicate(ids); return Lists.newArrayList(Iterables.filter(processors, byIds)); } /** * Return a set of processors for a given template * * @param template a template to parse * @return a set of processors in that template */ public static Set<ProcessorDTO> getProcessors(TemplateDTO template) { return getProcessors(template, false); } /** * Return a set of processors in a template, optionally allowing the framework to traverse into a templates input ports to get the connecting process groups * * @param template a template to parse * @param excludeInputs {@code true} will traverse down into the input ports and gather processors in the conencting groups, {@code false} will traverse input ports and their respective process * groups * @return return a set of processors */ public static Set<ProcessorDTO> getProcessors(TemplateDTO template, boolean excludeInputs) { Set<ProcessorDTO> processors = new HashSet<>(); for (ProcessorDTO processorDTO : template.getSnippet().getProcessors()) { processors.add(processorDTO); } if (template.getSnippet().getProcessGroups() != null) { for (ProcessGroupDTO groupDTO : template.getSnippet().getProcessGroups()) { processors.addAll(getProcessors(groupDTO)); } } if (excludeInputs) { final List<ProcessorDTO> inputs = NifiTemplateUtil.getInputProcessorsForTemplate(template); Iterables.removeIf(processors, new Predicate<ProcessorDTO>() { @Override public boolean apply(ProcessorDTO processorDTO) { return (inputs.contains(processorDTO)); } }); } return processors; } /** * Return all process groups in a template * * @param template a template to parse * @return a collection of all process groups in the template */ public static Collection<ProcessGroupDTO> getProcessGroups(TemplateDTO template) { return getProcessGroupsMap(template).values(); } /** * Return a map of processGroupId to process group * * @param template a template to parse * @return a map of processGroupId to process group */ public static Map<String, ProcessGroupDTO> getProcessGroupsMap(TemplateDTO template) { Map<String, ProcessGroupDTO> groups = new HashMap<>(); if (template.getSnippet().getProcessGroups() != null) { for (ProcessGroupDTO groupDTO : template.getSnippet().getProcessGroups()) { groups.putAll(getProcessGroupsMap(groupDTO)); } } return groups; } /** * Return all the process groups under a given process group (including all their children) * * @param group a process group * @return a collection of all the groups and their children */ public static Collection<ProcessGroupDTO> getProcessGroups(ProcessGroupDTO group) { return getProcessGroupsMap(group).values(); } /** * Return a map of the process group and their children * * @param group a process group * @return a map of the process group and their children */ private static Map<String, ProcessGroupDTO> getProcessGroupsMap(ProcessGroupDTO group) { Map<String, ProcessGroupDTO> groups = new HashMap<>(); groups.put(group.getId(), group); if (group.getContents() != null && group.getContents().getProcessGroups() != null) { for (ProcessGroupDTO groupDTO : group.getContents().getProcessGroups()) { groups.putAll(getProcessGroupsMap(groupDTO)); } } return groups; } /** * Return a map of all the processors, by processorId under a process group, including all children * * @param group a process group * @return a map of all processors in the group, including all child process groups */ public static Map<String, ProcessorDTO> getProcessorsMap(ProcessGroupDTO group) { Map<String, ProcessorDTO> processors = new HashMap<>(); if (group != null) { if (group.getContents() != null) { for (ProcessorDTO processorDTO : group.getContents().getProcessors()) { processors.put(processorDTO.getId(), processorDTO); } if (group.getContents().getProcessGroups() != null) { for (ProcessGroupDTO groupDTO : group.getContents().getProcessGroups()) { processors.putAll(getProcessorsMap(groupDTO)); } } } } return processors; } /** * Return a collection of all processors, including all children, in a process group * * @param group a process group * @return a collection of all processors, including all children, in a process group */ public static Collection<ProcessorDTO> getProcessors(ProcessGroupDTO group) { return getProcessorsMap(group).values(); } /** * Return a list of all the first level input/source processors in a process group. These processors dont have any connection incoming to them * * @param group a process group * @return a list of input processors */ public static List<ProcessorDTO> getInputProcessors(ProcessGroupDTO group) { List<ProcessorDTO> processors = new ArrayList<>(); List<String> processorIds = NifiConnectionUtil.getInputProcessorIds(group.getContents().getConnections()); Map<String, ProcessorDTO> map = new HashMap<>(); if (group.getContents() != null && group.getContents().getProcessors() != null) { for (ProcessorDTO processor : group.getContents().getProcessors()) { map.put(processor.getId(), processor); } } for (String processorId : processorIds) { if (map.containsKey(processorId)) { processors.add(map.get(processorId)); } } return processors; } /** * Return a list of all processors under a process group that have connections coming into them. * * @param group a process group * @return a list of all processors under a process group that have connections coming into them */ public static List<ProcessorDTO> getNonInputProcessors(ProcessGroupDTO group) { List<ProcessorDTO> processors = new ArrayList<>(); final List<ProcessorDTO> inputProcessors = getInputProcessors(group); if (group.getContents().getProcessors() != null) { processors = Lists.newArrayList( Iterables.filter(group.getContents().getProcessors(), new Predicate<ProcessorDTO>() { @Override public boolean apply(ProcessorDTO processorDTO) { return !inputProcessors.contains(processorDTO); } })); } if (group.getContents().getProcessGroups() != null) { for (ProcessGroupDTO groupDTO : group.getContents().getProcessGroups()) { processors.addAll(getNonInputProcessors(groupDTO)); } } return processors; } /** * Finds the first process group with the specified name. * * @param processGroups the list of process groups to filter * @param name the feed system name to match, case-insensitive * @return the matching process group, or {@code null} if not found */ @Nullable public static ProcessGroupDTO findFirstProcessGroupByName( @Nonnull final Collection<ProcessGroupDTO> processGroups, @Nonnull final String name) { return processGroups.stream().filter(processGroup -> processGroup.getName().equalsIgnoreCase(name)) .findAny().orElse(null); } /** * Filters the specified list of process groups for ones matching the specified feed name, including versioned process groups. * * @param processGroups the list of process groups to filter * @param feedName the feed system name to match, case-insensitive * @return the matching process groups */ @Nonnull public static Set<ProcessGroupDTO> findProcessGroupsByFeedName( @Nonnull final Collection<ProcessGroupDTO> processGroups, @Nonnull final String feedName) { Pattern pattern = Pattern.compile("^" + Pattern.quote(feedName) + "( - \\d+)?$", Pattern.CASE_INSENSITIVE); return processGroups.stream().filter(processGroup -> pattern.matcher(processGroup.getName()).matches()) .collect(Collectors.toSet()); } /** * common state of NiFi processors/components **/ public static enum PROCESS_STATE { RUNNING, STOPPED, DISABLED, ENABLED; } /** * common state of NiFi controller services **/ public static enum SERVICE_STATE { ENABLING, ENABLED, DISABLED; } /** * Find a processor by its type */ private static class ProcessorByTypePredicate implements Predicate<ProcessorDTO> { private String type; public ProcessorByTypePredicate(String type) { this.type = type; } @Override public boolean apply(ProcessorDTO processorDTO) { return processorDTO.getType().equalsIgnoreCase(type); } } /** * find a processor by its name */ private static class ProcessorByNamePredicate implements Predicate<ProcessorDTO> { private String name; public ProcessorByNamePredicate(String name) { this.name = name; } @Override public boolean apply(ProcessorDTO processorDTO) { return processorDTO.getName().equalsIgnoreCase(name); } } /** * find a processor by its id */ private static class ProcessorByIdPredicate implements Predicate<ProcessorDTO> { private String id; public ProcessorByIdPredicate(String id) { this.id = id; } @Override public boolean apply(ProcessorDTO processorDTO) { return processorDTO.getId().equalsIgnoreCase(id); } } /** * find a processor by a set of ids */ private static class ProcessorByIdsPredicate implements Predicate<ProcessorDTO> { private List<String> ids; public ProcessorByIdsPredicate(List<String> ids) { this.ids = ids; } @Override public boolean apply(ProcessorDTO processorDTO) { return ids.contains(processorDTO.getId()); } } }