/*
* JBoss, Home of Professional Open Source.
* Copyright 2015, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.wildfly.extension.batch.jberet.deployment;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import java.util.function.Supplier;
import javax.batch.runtime.JobExecution;
import javax.batch.runtime.JobInstance;
import org.jboss.as.controller.PathAddress;
import org.jboss.as.controller.PathElement;
import org.jboss.as.controller.registry.PlaceholderResource;
import org.jboss.as.controller.registry.PlaceholderResource.PlaceholderResourceEntry;
import org.jboss.as.controller.registry.Resource;
import org.jboss.dmr.ModelNode;
import org.wildfly.extension.batch.jberet._private.BatchLogger;
/**
* Represents a dynamic resource for batch {@link javax.batch.runtime.JobExecution job executions}.
*
* @author <a href="mailto:jperkins@redhat.com">James R. Perkins</a>
*/
public class BatchJobExecutionResource implements Resource {
private final Resource delegate;
private final WildFlyJobOperator jobOperator;
private final String jobName;
// Should be guarded by it's instance
private final Set<String> children = new LinkedHashSet<>();
BatchJobExecutionResource(final WildFlyJobOperator jobOperator, final String jobName) {
this(Factory.create(true), jobOperator, jobName);
}
private BatchJobExecutionResource(final Resource delegate, final WildFlyJobOperator jobOperator, final String jobName) {
this.delegate = delegate;
this.jobOperator = jobOperator;
this.jobName = jobName;
}
@Override
public ModelNode getModel() {
return delegate.getModel();
}
@Override
public void writeModel(final ModelNode newModel) {
delegate.writeModel(newModel);
}
@Override
public boolean isModelDefined() {
return delegate.isModelDefined();
}
@Override
public boolean hasChild(final PathElement element) {
if (BatchJobExecutionResourceDefinition.EXECUTION.equals(element.getKey())) {
return hasJobExecution(element.getValue());
}
return delegate.hasChild(element);
}
@Override
public Resource getChild(final PathElement element) {
if (BatchJobExecutionResourceDefinition.EXECUTION.equals(element.getKey())) {
if (hasJobExecution(element.getValue())) {
return PlaceholderResource.INSTANCE;
}
return null;
}
return delegate.getChild(element);
}
@Override
public Resource requireChild(final PathElement element) {
if (BatchJobExecutionResourceDefinition.EXECUTION.equals(element.getKey())) {
if (hasJobExecution(element.getValue())) {
return PlaceholderResource.INSTANCE;
}
throw new NoSuchResourceException(element);
}
return delegate.requireChild(element);
}
@Override
public boolean hasChildren(final String childType) {
if (BatchJobExecutionResourceDefinition.EXECUTION.equals(childType)) {
return !getChildrenNames(BatchJobExecutionResourceDefinition.EXECUTION).isEmpty();
}
return delegate.hasChildren(childType);
}
@Override
public Resource navigate(final PathAddress address) {
if (address.size() > 0 && BatchJobExecutionResourceDefinition.EXECUTION.equals(address.getElement(0).getKey())) {
if (address.size() > 1) {
throw new NoSuchResourceException(address.getElement(1));
}
return PlaceholderResource.INSTANCE;
}
return delegate.navigate(address);
}
@Override
public Set<String> getChildTypes() {
final Set<String> result = new LinkedHashSet<>(delegate.getChildTypes());
result.add(BatchJobExecutionResourceDefinition.EXECUTION);
return result;
}
@Override
public Set<String> getChildrenNames(final String childType) {
if (BatchJobExecutionResourceDefinition.EXECUTION.equals(childType)) {
synchronized (children) {
refreshChildren();
return new LinkedHashSet<>(children);
}
}
return delegate.getChildrenNames(childType);
}
@Override
public Set<ResourceEntry> getChildren(final String childType) {
if (BatchJobExecutionResourceDefinition.EXECUTION.equals(childType)) {
final Set<String> names = getChildrenNames(childType);
final Set<ResourceEntry> result = new LinkedHashSet<>(names.size());
for (String name : names) {
result.add(new PlaceholderResourceEntry(BatchJobExecutionResourceDefinition.EXECUTION, name));
}
return result;
}
return delegate.getChildren(childType);
}
@Override
public void registerChild(final PathElement address, final Resource resource) {
final String type = address.getKey();
if (BatchJobExecutionResourceDefinition.EXECUTION.equals(type)) {
throw BatchLogger.LOGGER.cannotRemoveResourceOfType(type);
}
delegate.registerChild(address, resource);
}
@Override
public void registerChild(PathElement address, int index, Resource resource) {
throw BatchLogger.LOGGER.indexedChildResourceRegistrationNotAvailable(address);
}
@Override
public Resource removeChild(final PathElement address) {
final String type = address.getKey();
if (BatchJobExecutionResourceDefinition.EXECUTION.equals(type)) {
throw BatchLogger.LOGGER.cannotRemoveResourceOfType(type);
}
return delegate.removeChild(address);
}
@Override
public Set<String> getOrderedChildTypes() {
return Collections.emptySet();
}
@Override
public boolean isRuntime() {
return delegate.isRuntime();
}
@Override
public boolean isProxy() {
return delegate.isProxy();
}
@Override
public Resource clone() {
return new BatchJobExecutionResource(delegate.clone(), jobOperator, jobName);
}
private boolean hasJobExecution(final String executionName) {
synchronized (children) {
if (children.contains(executionName)) {
return true;
}
// Load a cache of the names
refreshChildren();
return children.contains(executionName);
}
}
/**
* Note the access to the {@link #children} is <strong>not</strong> guarded here and needs to be externally
* guarded.
*/
private void refreshChildren() {
final List<JobExecution> executions = new ArrayList<>();
// Casting to (Supplier<List<JobInstance>>) is done here on purpose as a workaround for a bug in 1.8.0_45
final List<JobInstance> instances = jobOperator.allowMissingJob((Supplier<List<JobInstance>>)() -> jobOperator.getJobInstances(jobName, 0, jobOperator.getJobInstanceCount(jobName))
, Collections.emptyList());
for (JobInstance instance : instances) {
executions.addAll(jobOperator.getJobExecutions(instance));
}
for (JobExecution execution : executions) {
final String name = Long.toString(execution.getExecutionId());
if (!children.contains(name)) {
children.add(name);
}
}
}
}