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ServiceTaskTransformer.java
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ServiceTaskTransformer.java
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/*
* Zeebe Broker Core
* Copyright © 2017 camunda services GmbH (info@camunda.com)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package io.zeebe.broker.workflow.model.transformation.transformer;
import static io.zeebe.broker.Broker.LOG;
import static io.zeebe.util.buffer.BufferUtil.wrapString;
import io.zeebe.broker.workflow.model.BpmnStep;
import io.zeebe.broker.workflow.model.element.ExecutableServiceTask;
import io.zeebe.broker.workflow.model.element.ExecutableWorkflow;
import io.zeebe.broker.workflow.model.transformation.ModelElementTransformer;
import io.zeebe.broker.workflow.model.transformation.TransformContext;
import io.zeebe.model.bpmn.instance.ServiceTask;
import io.zeebe.model.bpmn.instance.zeebe.ZeebeHeader;
import io.zeebe.model.bpmn.instance.zeebe.ZeebeTaskDefinition;
import io.zeebe.model.bpmn.instance.zeebe.ZeebeTaskHeaders;
import io.zeebe.msgpack.spec.MsgPackWriter;
import io.zeebe.protocol.intent.WorkflowInstanceIntent;
import java.util.List;
import java.util.stream.Collectors;
import org.agrona.DirectBuffer;
import org.agrona.ExpandableArrayBuffer;
import org.agrona.MutableDirectBuffer;
import org.agrona.concurrent.UnsafeBuffer;
public class ServiceTaskTransformer implements ModelElementTransformer<ServiceTask> {
private static final int INITIAL_SIZE_KEY_VALUE_PAIR = 128;
private final MsgPackWriter msgPackWriter = new MsgPackWriter();
@Override
public Class<ServiceTask> getType() {
return ServiceTask.class;
}
@Override
public void transform(ServiceTask element, TransformContext context) {
final ExecutableWorkflow workflow = context.getCurrentWorkflow();
final ExecutableServiceTask serviceTask =
workflow.getElementById(element.getId(), ExecutableServiceTask.class);
transformTaskDefinition(element, serviceTask);
transformTaskHeaders(element, serviceTask);
bindLifecycle(serviceTask);
}
private void bindLifecycle(final ExecutableServiceTask serviceTask) {
serviceTask.bindLifecycleState(WorkflowInstanceIntent.ELEMENT_ACTIVATED, BpmnStep.CREATE_JOB);
serviceTask.bindLifecycleState(
WorkflowInstanceIntent.ELEMENT_TERMINATING, BpmnStep.TERMINATE_JOB_TASK);
}
private void transformTaskDefinition(
ServiceTask element, final ExecutableServiceTask serviceTask) {
final ZeebeTaskDefinition taskDefinition =
element.getSingleExtensionElement(ZeebeTaskDefinition.class);
serviceTask.setType(taskDefinition.getType());
serviceTask.setRetries(taskDefinition.getRetries());
}
private void transformTaskHeaders(ServiceTask element, final ExecutableServiceTask serviceTask) {
final ZeebeTaskHeaders taskHeaders = element.getSingleExtensionElement(ZeebeTaskHeaders.class);
if (taskHeaders != null) {
final List<ZeebeHeader> validHeaders =
taskHeaders
.getHeaders()
.stream()
.filter(this::isValidHeader)
.collect(Collectors.toList());
if (validHeaders.size() < taskHeaders.getHeaders().size()) {
LOG.warn(
"Ignoring invalid headers for task '{}'. Must have non-empty key and value.",
element.getName());
}
if (!validHeaders.isEmpty()) {
final DirectBuffer encodedHeaders = encode(validHeaders);
serviceTask.setEncodedHeaders(encodedHeaders);
}
}
}
private DirectBuffer encode(List<ZeebeHeader> taskHeaders) {
final MutableDirectBuffer buffer = new UnsafeBuffer(0, 0);
final ExpandableArrayBuffer expandableBuffer =
new ExpandableArrayBuffer(INITIAL_SIZE_KEY_VALUE_PAIR * taskHeaders.size());
msgPackWriter.wrap(expandableBuffer, 0);
msgPackWriter.writeMapHeader(taskHeaders.size());
taskHeaders.forEach(
h -> {
if (isValidHeader(h)) {
final DirectBuffer key = wrapString(h.getKey());
msgPackWriter.writeString(key);
final DirectBuffer value = wrapString(h.getValue());
msgPackWriter.writeString(value);
}
});
buffer.wrap(expandableBuffer.byteArray(), 0, msgPackWriter.getOffset());
return buffer;
}
private boolean isValidHeader(ZeebeHeader header) {
return header != null
&& header.getValue() != null
&& !header.getValue().isEmpty()
&& header.getKey() != null
&& !header.getKey().isEmpty();
}
}