zeebe入门课程22-Java使用4 完整测试例子

其他 2019-05-12 19:38:19 阅读次数: 0
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Deploy a Workflow

  1. 首先启动Zeebe broker。默认访问地址是，localhost:26500 (default)

示例代码如下：

/*
 * Copyright © 2017 camunda services GmbH ([email protected])
 *
 * 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 io.zeebe.example.workflow;

import io.zeebe.client.ZeebeClient;
import io.zeebe.client.ZeebeClientBuilder;
import io.zeebe.client.api.events.DeploymentEvent;

public class WorkflowDeployer {

  public static void main(final String[] args) {
    final String broker = "localhost:26500";

    final ZeebeClientBuilder clientBuilder =
        ZeebeClient.newClientBuilder().brokerContactPoint(broker);

    try (ZeebeClient client = clientBuilder.build()) {

      final DeploymentEvent deploymentEvent =
          client.newDeployCommand().addResourceFromClasspath("demoProcess.bpmn").send().join();

      System.out.println("Deployment created with key: " + deploymentEvent.getKey());
    }
  }
}

BPMN流程文件如下：

<?xml version="1.0" encoding="UTF-8"?>
<bpmn:definitions xmlns:bpmn="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:di="http://www.omg.org/spec/DD/20100524/DI" xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" xmlns:camunda="http://camunda.org/schema/1.0/bpmn" xmlns:zeebe="http://camunda.org/schema/zeebe/1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" id="Definitions_1" targetNamespace="http://bpmn.io/schema/bpmn" exporter="Camunda Modeler" exporterVersion="1.5.0-nightly">
  <bpmn:process id="demoProcess" isExecutable="true">
    <bpmn:startEvent id="start" name="start">
      <bpmn:outgoing>SequenceFlow_1sz6737</bpmn:outgoing>
    </bpmn:startEvent>
    <bpmn:sequenceFlow id="SequenceFlow_1sz6737" sourceRef="start" targetRef="taskA" />
    <bpmn:sequenceFlow id="SequenceFlow_06ytcxw" sourceRef="taskA" targetRef="taskB" />
    <bpmn:sequenceFlow id="SequenceFlow_1oh45y7" sourceRef="taskB" targetRef="taskC" />
    <bpmn:endEvent id="end" name="end">
      <bpmn:incoming>SequenceFlow_148rk2p</bpmn:incoming>
    </bpmn:endEvent>
    <bpmn:sequenceFlow id="SequenceFlow_148rk2p" sourceRef="taskC" targetRef="end" />
    <bpmn:serviceTask id="taskA" name="task A">
      <bpmn:extensionElements>
        <zeebe:taskDefinition type="foo" />
      </bpmn:extensionElements>
      <bpmn:incoming>SequenceFlow_1sz6737</bpmn:incoming>
      <bpmn:outgoing>SequenceFlow_06ytcxw</bpmn:outgoing>
    </bpmn:serviceTask>
    <bpmn:serviceTask id="taskB" name="task B">
      <bpmn:extensionElements>
        <zeebe:taskDefinition type="bar" />
      </bpmn:extensionElements>
      <bpmn:incoming>SequenceFlow_06ytcxw</bpmn:incoming>
      <bpmn:outgoing>SequenceFlow_1oh45y7</bpmn:outgoing>
    </bpmn:serviceTask>
    <bpmn:serviceTask id="taskC" name="task C">
      <bpmn:extensionElements>
        <zeebe:taskDefinition type="foo" />
      </bpmn:extensionElements>
      <bpmn:incoming>SequenceFlow_1oh45y7</bpmn:incoming>
      <bpmn:outgoing>SequenceFlow_148rk2p</bpmn:outgoing>
    </bpmn:serviceTask>
  </bpmn:process>
  <bpmndi:BPMNDiagram id="BPMNDiagram_1">
    <bpmndi:BPMNPlane id="BPMNPlane_1" bpmnElement="demoProcess">
      <bpmndi:BPMNShape id="_BPMNShape_StartEvent_2" bpmnElement="start">
        <dc:Bounds x="173" y="102" width="36" height="36" />
        <bpmndi:BPMNLabel>
          <dc:Bounds x="180" y="138" width="22" height="12" />
        </bpmndi:BPMNLabel>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge id="SequenceFlow_1sz6737_di" bpmnElement="SequenceFlow_1sz6737">
        <di:waypoint xsi:type="dc:Point" x="209" y="120" />
        <di:waypoint xsi:type="dc:Point" x="310" y="120" />
        <bpmndi:BPMNLabel>
          <dc:Bounds x="260" y="105" width="0" height="0" />
        </bpmndi:BPMNLabel>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge id="SequenceFlow_06ytcxw_di" bpmnElement="SequenceFlow_06ytcxw">
        <di:waypoint xsi:type="dc:Point" x="410" y="120" />
        <di:waypoint xsi:type="dc:Point" x="502" y="120" />
        <bpmndi:BPMNLabel>
          <dc:Bounds x="456" y="105" width="0" height="0" />
        </bpmndi:BPMNLabel>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge id="SequenceFlow_1oh45y7_di" bpmnElement="SequenceFlow_1oh45y7">
        <di:waypoint xsi:type="dc:Point" x="602" y="120" />
        <di:waypoint xsi:type="dc:Point" x="694" y="120" />
        <bpmndi:BPMNLabel>
          <dc:Bounds x="648" y="105" width="0" height="0" />
        </bpmndi:BPMNLabel>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNShape id="EndEvent_0gbv3sc_di" bpmnElement="end">
        <dc:Bounds x="867" y="102" width="36" height="36" />
        <bpmndi:BPMNLabel>
          <dc:Bounds x="876" y="138" width="18" height="12" />
        </bpmndi:BPMNLabel>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge id="SequenceFlow_148rk2p_di" bpmnElement="SequenceFlow_148rk2p">
        <di:waypoint xsi:type="dc:Point" x="794" y="120" />
        <di:waypoint xsi:type="dc:Point" x="867" y="120" />
        <bpmndi:BPMNLabel>
          <dc:Bounds x="831" y="105" width="0" height="0" />
        </bpmndi:BPMNLabel>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNShape id="ServiceTask_09m0goq_di" bpmnElement="taskA">
        <dc:Bounds x="310" y="80" width="100" height="80" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape id="ServiceTask_0sryj72_di" bpmnElement="taskB">
        <dc:Bounds x="502" y="80" width="100" height="80" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape id="ServiceTask_1xu4l3g_di" bpmnElement="taskC">
        <dc:Bounds x="694" y="80" width="100" height="80" />
      </bpmndi:BPMNShape>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
</bpmn:definitions>

创建流程实例

/*
 * Copyright © 2017 camunda services GmbH ([email protected])
 *
 * 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 io.zeebe.example.workflow;

import io.zeebe.client.ZeebeClient;
import io.zeebe.client.ZeebeClientBuilder;
import io.zeebe.client.api.events.WorkflowInstanceEvent;

public class WorkflowInstanceCreator {

  public static void main(final String[] args) {
    final String broker = "127.0.0.1:26500";

    final String bpmnProcessId = "demoProcess";

    final ZeebeClientBuilder builder = ZeebeClient.newClientBuilder().brokerContactPoint(broker);

    try (ZeebeClient client = builder.build()) {

      System.out.println("Creating workflow instance");

      final WorkflowInstanceEvent workflowInstanceEvent =
          client
              .newCreateInstanceCommand()
              .bpmnProcessId(bpmnProcessId)
              .latestVersion()
              .send()
              .join();

      System.out.println(
          "Workflow instance created with key: " + workflowInstanceEvent.getWorkflowInstanceKey());
    }
  }
}


/*
 * Copyright © 2017 camunda services GmbH ([email protected])
 *
 * 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 io.zeebe.example.workflow;

import io.zeebe.client.ZeebeClient;
import io.zeebe.client.ZeebeClientBuilder;
import io.zeebe.client.api.ZeebeFuture;
import io.zeebe.client.api.events.WorkflowInstanceEvent;

public class NonBlockingWorkflowInstanceCreator {
  public static void main(final String[] args) {
    final String broker = "127.0.0.1:26500";
    final int numberOfInstances = 100_000;
    final String bpmnProcessId = "demoProcess";

    final ZeebeClientBuilder builder = ZeebeClient.newClientBuilder().brokerContactPoint(broker);

    try (ZeebeClient client = builder.build()) {
      System.out.println("Creating " + numberOfInstances + " workflow instances");

      final long startTime = System.currentTimeMillis();

      long instancesCreating = 0;

      while (instancesCreating < numberOfInstances) {
        // this is non-blocking/async => returns a future
        final ZeebeFuture<WorkflowInstanceEvent> future =
            client.newCreateInstanceCommand().bpmnProcessId(bpmnProcessId).latestVersion().send();

        // could put the future somewhere and eventually wait for its completion

        instancesCreating++;
      }

      // creating one more instance; joining on this future ensures
      // that all the other create commands were handled
      client.newCreateInstanceCommand().bpmnProcessId(bpmnProcessId).latestVersion().send().join();

      System.out.println("Took: " + (System.currentTimeMillis() - startTime));
    }
  }
}

Request all Workflows

/*
 * Copyright © 2017 camunda services GmbH ([email protected])
 *
 * 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 io.zeebe.example.workflow;

import io.zeebe.client.ZeebeClient;
import io.zeebe.client.ZeebeClientBuilder;
import io.zeebe.client.api.commands.WorkflowResource;
import io.zeebe.client.api.commands.Workflows;

public class DeploymentViewer {

  public static void main(final String[] args) {

    final String broker = "localhost:26500";

    final ZeebeClientBuilder clientBuilder =
        ZeebeClient.newClientBuilder().brokerContactPoint(broker);

    try (ZeebeClient client = clientBuilder.build()) {

      final Workflows workflows = client.newWorkflowRequest().send().join();

      System.out.println("Printing all deployed workflows:");

      workflows
          .getWorkflows()
          .forEach(
              wf -> {
                System.out.println("Workflow resource for " + wf + ":");

                final WorkflowResource resource =
                    client.newResourceRequest().workflowKey(wf.getWorkflowKey()).send().join();

                System.out.println(resource);
              });

      System.out.println("Done");
    }
  }
}

开启定时器

/*
 * Copyright © 2017 camunda services GmbH ([email protected])
 *
 * 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 io.zeebe.example.job;

import io.zeebe.client.ZeebeClient;
import io.zeebe.client.ZeebeClientBuilder;
import io.zeebe.client.api.clients.JobClient;
import io.zeebe.client.api.response.ActivatedJob;
import io.zeebe.client.api.subscription.JobHandler;
import io.zeebe.client.api.subscription.JobWorker;
import java.time.Duration;
import java.util.Scanner;

public class JobWorkerCreator {
  public static void main(final String[] args) {
    final String broker = "127.0.0.1:26500";

    final String jobType = "foo";

    final ZeebeClientBuilder builder = ZeebeClient.newClientBuilder().brokerContactPoint(broker);

    try (ZeebeClient client = builder.build()) {

      System.out.println("Opening job worker.");

      final JobWorker workerRegistration =
          client
              .newWorker()
              .jobType(jobType)
              .handler(new ExampleJobHandler())
              .timeout(Duration.ofSeconds(10))
              .open();

      System.out.println("Job worker opened and receiving jobs.");

      // call workerRegistration.close() to close it

      // run until System.in receives exit command
      waitUntilSystemInput("exit");
    }
  }

  private static class ExampleJobHandler implements JobHandler {
    @Override
    public void handle(final JobClient client, final ActivatedJob job) {
      // here: business logic that is executed with every job
      System.out.println(
          String.format(
              "[type: %s, key: %s, lockExpirationTime: %s]\n[headers: %s]\n[variables: %s]\n===",
              job.getType(),
              job.getKey(),
              job.getDeadline().toString(),
              job.getHeaders(),
              job.getVariables()));

      client.newCompleteCommand(job.getKey()).send().join();
    }
  }

  private static void waitUntilSystemInput(final String exitCode) {
    try (Scanner scanner = new Scanner(System.in)) {
      while (scanner.hasNextLine()) {
        final String nextLine = scanner.nextLine();
        if (nextLine.contains(exitCode)) {
          return;
        }
      }
    }
  }
}

Handle variables as POJO

/*
 * Copyright © 2017 camunda services GmbH ([email protected])
 *
 * 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 io.zeebe.example.data;

import io.zeebe.client.ZeebeClient;
import io.zeebe.client.ZeebeClientBuilder;
import io.zeebe.client.api.clients.JobClient;
import io.zeebe.client.api.response.ActivatedJob;
import io.zeebe.client.api.subscription.JobHandler;
import java.util.Scanner;

public class HandleVariablesAsPojo {
  public static void main(final String[] args) {
    final String broker = "127.0.0.1:26500";

    final ZeebeClientBuilder builder = ZeebeClient.newClientBuilder().brokerContactPoint(broker);

    try (ZeebeClient client = builder.build()) {
      final Order order = new Order();
      order.setOrderId(31243);

      client
          .newCreateInstanceCommand()
          .bpmnProcessId("demoProcess")
          .latestVersion()
          .variables(order)
          .send()
          .join();

      client.newWorker().jobType("foo").handler(new DemoJobHandler()).open();

      // run until System.in receives exit command
      waitUntilSystemInput("exit");
    }
  }

  private static class DemoJobHandler implements JobHandler {
    @Override
    public void handle(final JobClient client, final ActivatedJob job) {
      // read the variables of the job
      final Order order = job.getVariablesAsType(Order.class);
      System.out.println("new job with orderId: " + order.getOrderId());

      // update the variables and complete the job
      order.setTotalPrice(46.50);

      client.newCompleteCommand(job.getKey()).variables(order).send();
    }
  }

  public static class Order {
    private long orderId;
    private double totalPrice;

    public long getOrderId() {
      return orderId;
    }

    public void setOrderId(final long orderId) {
      this.orderId = orderId;
    }

    public double getTotalPrice() {
      return totalPrice;
    }

    public void setTotalPrice(final double totalPrice) {
      this.totalPrice = totalPrice;
    }
  }

  private static void waitUntilSystemInput(final String exitCode) {
    try (Scanner scanner = new Scanner(System.in)) {
      while (scanner.hasNextLine()) {
        final String nextLine = scanner.nextLine();
        if (nextLine.contains(exitCode)) {
          return;
        }
      }
    }
  }
}

Request Cluster Topology

/*
 * Copyright © 2017 camunda services GmbH ([email protected])
 *
 * 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 io.zeebe.example.cluster;

import io.zeebe.client.ZeebeClient;
import io.zeebe.client.ZeebeClientBuilder;
import io.zeebe.client.api.commands.Topology;

public class TopologyViewer {

  public static void main(final String[] args) {
    final String broker = "127.0.0.1:26500";

    final ZeebeClientBuilder builder = ZeebeClient.newClientBuilder().brokerContactPoint(broker);

    try (ZeebeClient client = builder.build()) {
      System.out.println("Requesting topology with initial contact point " + broker);

      final Topology topology = client.newTopologyRequest().send().join();

      System.out.println("Topology:");
      topology
          .getBrokers()
          .forEach(
              b -> {
                System.out.println("    " + b.getAddress());
                b.getPartitions()
                    .forEach(
                        p ->
                            System.out.println(
                                "      " + p.getPartitionId() + " - " + p.getRole()));
              });

      System.out.println("Done.");
    }
  }
}

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