Java tutorial
/* 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. */ package com.activiti.service.activiti; import java.text.MessageFormat; import org.apache.commons.lang3.StringUtils; import org.apache.http.HttpStatus; import org.apache.http.client.methods.HttpDelete; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.methods.HttpPost; import org.apache.http.client.methods.HttpPut; import org.apache.http.client.utils.URIBuilder; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import com.activiti.domain.ServerConfig; import com.activiti.service.activiti.exception.ActivitiServiceException; import com.fasterxml.jackson.databind.JsonNode; import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.node.ArrayNode; import com.fasterxml.jackson.databind.node.ObjectNode; /** * Service for invoking Activiti REST services. */ @Service public class TaskService { public static final String HISTORIC_TASK_LIST_URL = "history/historic-task-instances"; public static final String HISTORIC_TASK_QUERY_URL = "query/historic-task-instances"; public static final String HISTORIC_TASK_URL = "history/historic-task-instances/{0}"; public static final String RUNTIME_TASK_URL = "runtime/tasks/{0}"; public static final String HISTORIC_VARIABLE_INSTANCE_LIST_URL = "history/historic-variable-instances"; public static final String HISTORIC_TASK_IDENTITY_LINK_LIST_URL = "history/historic-task-instances/{0}/identitylinks"; public static final String[] TASK_FILTERS = new String[] { "taskNameLike", "taskAssigneeLike", "taskOwner", "finished", "dueDateAfter", "dueDateBefore", "taskCompletedAfter", "taskCompletedBefore", "taskCreatedAfter", "taskCreatedBefore", "parentTaskId", "processInstanceId" }; private static final String DEFAULT_SUBTASK_RESULT_SIZE = "1024"; private static final String DEFAULT_VARIABLE_RESULT_SIZE = "1024"; @Autowired protected ActivitiClientService clientUtil; @Autowired protected ObjectMapper objectMapper; public JsonNode listTasks(ServerConfig serverConfig, ObjectNode bodyNode) { JsonNode resultNode = null; try { URIBuilder builder = clientUtil.createUriBuilder(HISTORIC_TASK_QUERY_URL); String uri = clientUtil.getUriWithPagingAndOrderParameters(builder, bodyNode); HttpPost post = clientUtil.createPost(uri, serverConfig); post.setEntity(clientUtil.createStringEntity(bodyNode.toString())); resultNode = clientUtil.executeRequest(post, serverConfig); } catch (Exception e) { throw new ActivitiServiceException(e.getMessage(), e); } return resultNode; } public JsonNode getTask(ServerConfig serverConfig, String taskId, boolean runtime) { if (taskId == null) { throw new IllegalArgumentException("Task id is required"); } URIBuilder builder = null; if (runtime) { builder = clientUtil.createUriBuilder(MessageFormat.format(RUNTIME_TASK_URL, taskId)); } else { builder = clientUtil.createUriBuilder(MessageFormat.format(HISTORIC_TASK_URL, taskId)); } HttpGet get = new HttpGet(clientUtil.getServerUrl(serverConfig, builder)); return clientUtil.executeRequest(get, serverConfig); } /** * @return true, if the task was deleted. False, if deleting the task failed. */ public void deleteTask(ServerConfig serverConfig, String taskId) { if (taskId == null) { throw new IllegalArgumentException("Task id is required"); } JsonNode taskNode = getTask(serverConfig, taskId, false); if (taskNode.has("endTime")) { JsonNode endTimeNode = taskNode.get("endTime"); if (endTimeNode != null && !endTimeNode.isNull() && StringUtils.isNotEmpty(endTimeNode.asText())) { // Completed task URIBuilder builder = clientUtil.createUriBuilder(MessageFormat.format(HISTORIC_TASK_URL, taskId)); HttpDelete delete = new HttpDelete(clientUtil.getServerUrl(serverConfig, builder)); clientUtil.executeRequestNoResponseBody(delete, serverConfig, HttpStatus.SC_NO_CONTENT); } else { // Not completed task URIBuilder builder = clientUtil .createUriBuilder(MessageFormat.format(RUNTIME_TASK_URL, taskId) + "?cascadeHistory=true"); HttpDelete delete = new HttpDelete(clientUtil.getServerUrl(serverConfig, builder)); clientUtil.executeRequestNoResponseBody(delete, serverConfig, HttpStatus.SC_NO_CONTENT); } } } public void executeTaskAction(ServerConfig serverConfig, String taskId, JsonNode actionRequest) { if (taskId == null) { throw new IllegalArgumentException("Task id is required"); } URIBuilder builder = clientUtil.createUriBuilder(MessageFormat.format(RUNTIME_TASK_URL, taskId)); HttpPost post = clientUtil.createPost(builder, serverConfig); post.setEntity(clientUtil.createStringEntity(actionRequest)); clientUtil.executeRequestNoResponseBody(post, serverConfig, HttpStatus.SC_OK); } public void updateTask(ServerConfig serverConfig, String taskId, JsonNode actionRequest) { if (taskId == null) { throw new IllegalArgumentException("Task id is required"); } URIBuilder builder = clientUtil.createUriBuilder(MessageFormat.format(RUNTIME_TASK_URL, taskId)); HttpPut put = clientUtil.createPut(builder, serverConfig); put.setEntity(clientUtil.createStringEntity(actionRequest)); clientUtil.executeRequestNoResponseBody(put, serverConfig, HttpStatus.SC_OK); } public JsonNode getSubTasks(ServerConfig serverConfig, String taskId) { URIBuilder builder = clientUtil.createUriBuilder(HISTORIC_TASK_LIST_URL); builder.addParameter("parentTaskId", taskId); builder.addParameter("size", DEFAULT_SUBTASK_RESULT_SIZE); HttpGet get = new HttpGet(clientUtil.getServerUrl(serverConfig, builder)); return clientUtil.executeRequest(get, serverConfig); } public JsonNode getVariables(ServerConfig serverConfig, String taskId) { URIBuilder builder = clientUtil.createUriBuilder(HISTORIC_VARIABLE_INSTANCE_LIST_URL); builder.addParameter("taskId", taskId); builder.addParameter("size", DEFAULT_VARIABLE_RESULT_SIZE); builder.addParameter("sort", "variableName"); HttpGet get = new HttpGet(clientUtil.getServerUrl(serverConfig, builder)); return clientUtil.executeRequest(get, serverConfig); } public JsonNode getIdentityLinks(ServerConfig serverConfig, String taskId) { URIBuilder builder = clientUtil .createUriBuilder(MessageFormat.format(HISTORIC_TASK_IDENTITY_LINK_LIST_URL, taskId)); HttpGet get = new HttpGet(clientUtil.getServerUrl(serverConfig, builder)); return clientUtil.executeRequest(get, serverConfig); } }