| /* |
| * 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 java.util.Collections; |
| import java.util.Date; |
| import java.util.List; |
| import java.util.Objects; |
| |
| public class StandardAsynchronousWebRequest<R, T> implements AsynchronousWebRequest<R, T> { |
| private final String id; |
| private final String componentId; |
| private final NiFiUser user; |
| private final List<UpdateStep> updateSteps; |
| private final R request; |
| |
| private volatile boolean complete = false; |
| private volatile Date lastUpdated = new Date(); |
| private volatile int percentComplete; |
| private volatile String failureReason; |
| private volatile boolean cancelled; |
| private volatile T results; |
| private volatile Runnable cancelCallback; |
| |
| private int currentStepIndex = 0; |
| |
| public StandardAsynchronousWebRequest(final String requestId, final R request, final String componentId, final NiFiUser user, final List<UpdateStep> updateSteps) { |
| this.id = requestId; |
| this.componentId = componentId; |
| this.user = user; |
| this.updateSteps = updateSteps; |
| this.request = request; |
| } |
| |
| public synchronized UpdateStep getCurrentStep() { |
| return (updateSteps == null || updateSteps.size() <= currentStepIndex) ? null : updateSteps.get(currentStepIndex); |
| } |
| |
| public R getRequest() { |
| return request; |
| } |
| |
| public String getRequestId() { |
| return id; |
| } |
| |
| @Override |
| public boolean isComplete() { |
| return complete; |
| } |
| |
| @Override |
| public String getComponentId() { |
| return componentId; |
| } |
| |
| @Override |
| public void setCancelCallback(final Runnable runnable) { |
| this.cancelCallback = runnable; |
| } |
| |
| @Override |
| public void markStepComplete() { |
| markStepComplete(this.results); |
| } |
| |
| @Override |
| public synchronized void markStepComplete(final T results) { |
| if (isCancelled() || isComplete()) { |
| return; |
| } |
| |
| final UpdateStep currentStep = getCurrentStep(); |
| if (currentStep != null) { |
| currentStep.markCompleted(); |
| } |
| |
| currentStepIndex++; |
| this.complete = currentStepIndex >= updateSteps.size(); |
| this.results = results; |
| this.lastUpdated = new Date(); |
| this.percentComplete = currentStepIndex * 100 / updateSteps.size(); |
| } |
| |
| @Override |
| public synchronized String getState() { |
| if (isComplete()) { |
| return "Complete"; |
| } |
| |
| String failureReason = getFailureReason(); |
| if (failureReason != null) { |
| return "Failed: " + failureReason; |
| } |
| |
| return getCurrentStep().getDescription(); |
| } |
| |
| @Override |
| public Date getLastUpdated() { |
| return lastUpdated; |
| } |
| |
| @Override |
| public List<UpdateStep> getUpdateSteps() { |
| return Collections.unmodifiableList(updateSteps); |
| } |
| |
| @Override |
| public int getPercentComplete() { |
| return percentComplete; |
| } |
| |
| @Override |
| public NiFiUser getUser() { |
| return user; |
| } |
| |
| @Override |
| public synchronized void fail(final String explanation) { |
| this.failureReason = Objects.requireNonNull(explanation); |
| this.complete = true; |
| this.results = null; |
| this.lastUpdated = new Date(); |
| |
| getCurrentStep().fail(explanation); |
| } |
| |
| @Override |
| public synchronized String getFailureReason() { |
| return failureReason; |
| } |
| |
| @Override |
| public T getResults() { |
| return results; |
| } |
| |
| @Override |
| public void cancel() { |
| this.cancelled = true; |
| percentComplete = 100; |
| fail("Request cancelled by user"); |
| |
| if (cancelCallback != null) { |
| cancelCallback.run(); |
| } |
| } |
| |
| @Override |
| public boolean isCancelled() { |
| return cancelled; |
| } |
| } |