| /* |
| * 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.web.api.concurrent; |
| |
| import org.apache.nifi.authorization.user.NiFiUser; |
| import org.apache.nifi.authorization.user.NiFiUserDetails; |
| import org.apache.nifi.web.ResourceNotFoundException; |
| import org.apache.nifi.web.security.token.NiFiAuthenticationToken; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.springframework.security.core.Authentication; |
| import org.springframework.security.core.context.SecurityContextHolder; |
| |
| import java.util.Date; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Objects; |
| import java.util.concurrent.ArrayBlockingQueue; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ConcurrentMap; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.ThreadFactory; |
| import java.util.concurrent.ThreadPoolExecutor; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.atomic.AtomicLong; |
| import java.util.function.Consumer; |
| import java.util.stream.Collectors; |
| |
| public class AsyncRequestManager<R, T> implements RequestManager<R, T> { |
| private static final Logger logger = LoggerFactory.getLogger(AsyncRequestManager.class); |
| |
| private final long requestExpirationMillis; |
| private final int maxConcurrentRequests; |
| private final ConcurrentMap<String, AsynchronousWebRequest<R, T>> requests = new ConcurrentHashMap<>(); |
| |
| private final ExecutorService threadPool; |
| |
| |
| public AsyncRequestManager(final int maxConcurrentRequests, final long requestExpirationMillis, final String threadNamePrefix) { |
| this.requestExpirationMillis = requestExpirationMillis; |
| this.maxConcurrentRequests = maxConcurrentRequests; |
| |
| this.threadPool = new ThreadPoolExecutor(1, maxConcurrentRequests, 5L, TimeUnit.SECONDS, |
| new ArrayBlockingQueue<>(1), |
| new ThreadFactory() { |
| private final AtomicLong counter = new AtomicLong(0L); |
| |
| @Override |
| public Thread newThread(final Runnable r) { |
| final Thread thread = Executors.defaultThreadFactory().newThread(r); |
| thread.setName(threadNamePrefix + "-" + counter.incrementAndGet()); |
| thread.setDaemon(true); |
| return thread; |
| } |
| }); |
| |
| } |
| |
| private String getKey(final String type, final String request) { |
| return type + "/" + request; |
| } |
| |
| @Override |
| public void submitRequest(final String type, final String requestId, final AsynchronousWebRequest<R, T> request, final Consumer<AsynchronousWebRequest<R, T>> task) { |
| Objects.requireNonNull(type); |
| Objects.requireNonNull(requestId); |
| Objects.requireNonNull(request); |
| Objects.requireNonNull(task); |
| |
| // before adding to the request map, purge any old requests. Must do this by creating a List of ID's |
| // and then removing those ID's one-at-a-time in order to avoid ConcurrentModificationException. |
| final Date oneMinuteAgo = new Date(System.currentTimeMillis() - requestExpirationMillis); |
| final List<String> completedRequestIds = requests.entrySet().stream() |
| .filter(entry -> entry.getValue().isComplete()) |
| .filter(entry -> entry.getValue().getLastUpdated().before(oneMinuteAgo)) |
| .map(Map.Entry::getKey) |
| .collect(Collectors.toList()); |
| |
| completedRequestIds.forEach(requests::remove); |
| |
| final int requestCount = requests.size(); |
| if (requestCount > maxConcurrentRequests) { |
| throw new IllegalStateException("There are already " + requestCount + " update requests for variable registries. " |
| + "Cannot issue any more requests until the older ones are deleted or expire"); |
| } |
| |
| final String key = getKey(type, requestId); |
| final AsynchronousWebRequest<R, T> existing = this.requests.putIfAbsent(key, request); |
| if (existing != null) { |
| throw new IllegalArgumentException("A requests already exists with this ID and type"); |
| } |
| |
| threadPool.submit(new Runnable() { |
| @Override |
| public void run() { |
| try { |
| // set the user authentication token |
| final Authentication authentication = new NiFiAuthenticationToken(new NiFiUserDetails(request.getUser())); |
| SecurityContextHolder.getContext().setAuthentication(authentication); |
| |
| task.accept(request); |
| } catch (final Exception e) { |
| logger.error("Failed to perform asynchronous task", e); |
| request.fail("Encountered unexpected error when performing asynchronous task: " + e); |
| } finally { |
| // clear the authentication token |
| SecurityContextHolder.getContext().setAuthentication(null); |
| } |
| } |
| }); |
| } |
| |
| |
| @Override |
| public AsynchronousWebRequest<R, T> removeRequest(final String type, final String id, final NiFiUser user) { |
| Objects.requireNonNull(type); |
| Objects.requireNonNull(id); |
| Objects.requireNonNull(user); |
| |
| final String key = getKey(type, id); |
| final AsynchronousWebRequest<R, T> request = requests.get(key); |
| if (request == null) { |
| throw new ResourceNotFoundException("Could not find a Request with identifier " + id); |
| } |
| |
| if (!request.getUser().equals(user)) { |
| throw new IllegalArgumentException("Only the user that submitted the update request can delete it."); |
| } |
| |
| if (!request.isComplete()) { |
| request.cancel(); |
| } |
| |
| requests.remove(key); |
| return request; |
| } |
| |
| @Override |
| public AsynchronousWebRequest<R, T> getRequest(final String type, final String id, final NiFiUser user) { |
| Objects.requireNonNull(type); |
| Objects.requireNonNull(id); |
| Objects.requireNonNull(user); |
| |
| final String key = getKey(type, id); |
| final AsynchronousWebRequest<R, T> request = requests.get(key); |
| if (request == null) { |
| throw new ResourceNotFoundException("Could not find a Request with identifier " + id); |
| } |
| |
| if (!request.getUser().equals(user)) { |
| throw new IllegalArgumentException("Only the user that submitted the update request can delete it."); |
| } |
| |
| return request; |
| } |
| |
| } |