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[apex] New Rule: Queueable Should Attach Finalizer (#5303)

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Merge pull request #5303 from mitchspano:Require_Finalizer
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Andreas Dangel 2024-11-17 15:46:05 +01:00
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1
.all-contributorsrc
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@ -7517,6 +7517,7 @@
"avatar_url": "https://avatars.githubusercontent.com/u/18402464?v=4",
"profile": "https://github.com/mitchspano",
"contributions": [
"code",
"bug"
]
},

9
docs/pages/release_notes.md
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@ -14,10 +14,18 @@ This is a {{ site.pmd.release_type }} release.
### 🚀 New and noteworthy
### 🌟 New and changed rules
#### New Rules
* The new Apex rule {% rule apex/bestpractices/QueueableWithoutFinalizer %} detects when the Queueable interface
is used but a Finalizer is not attached. Without attaching a Finalizer, there is no way of designing error
recovery actions should the Queueable action fail.
### 🐛 Fixed Issues
* ant
* [#1860](https://github.com/pmd/pmd/issues/1860): \[ant] Reflective access warnings on java > 9 and java < 17
* apex
* [#5302](https://github.com/pmd/pmd/issues/5302): \[apex] New Rule: Queueable Should Attach Finalizer
* [#5333](https://github.com/pmd/pmd/issues/5333): \[apex] Token recognition errors for string containing unicode escape sequence
* html
* [#5322](https://github.com/pmd/pmd/issues/5322): \[html] CPD throws exception on when HTML file is missing closing tag
@ -42,6 +50,7 @@ This is a {{ site.pmd.release_type }} release.
### ✨ External Contributions
* [#5284](https://github.com/pmd/pmd/pull/5284): \[apex] Use case-insensitive input stream to avoid choking on Unicode escape sequences - [Willem A. Hajenius](https://github.com/wahajenius) (@wahajenius)
* [#5303](https://github.com/pmd/pmd/pull/5303): \[apex] New Rule: Queueable Should Attach Finalizer - [Mitch Spano](https://github.com/mitchspano) (@mitchspano)
{% endtocmaker %}

92
pmd-apex/src/main/java/net/sourceforge/pmd/lang/apex/rule/bestpractices/QueueableWithoutFinalizerRule.java Normal file
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@ -0,0 +1,92 @@
/*
* BSD-style license; for more info see http://pmd.sourceforge.net/license.html
*/
package net.sourceforge.pmd.lang.apex.rule.bestpractices;
import java.util.List;
import org.checkerframework.checker.nullness.qual.NonNull;
import net.sourceforge.pmd.lang.apex.ast.ASTMethod;
import net.sourceforge.pmd.lang.apex.ast.ASTMethodCallExpression;
import net.sourceforge.pmd.lang.apex.ast.ASTParameter;
import net.sourceforge.pmd.lang.apex.ast.ASTUserClass;
import net.sourceforge.pmd.lang.apex.rule.AbstractApexRule;
import net.sourceforge.pmd.lang.rule.RuleTargetSelector;
/**
* Scans classes which implement the `Queueable` interface. If the `public void
* execute(QueueableContext context)` method does not call the
* `System.attachFinalizer(Finalizer f)` method, then a violation will be added
* to the `execute` method.
*
* @author mitchspano
*/
public class QueueableWithoutFinalizerRule extends AbstractApexRule {
private static final String EXECUTE = "execute";
private static final String QUEUEABLE = "queueable";
private static final String QUEUEABLE_CONTEXT = "queueablecontext";
private static final String SYSTEM_ATTACH_FINALIZER = "system.attachfinalizer";
@Override
protected @NonNull RuleTargetSelector buildTargetSelector() {
return RuleTargetSelector.forTypes(ASTUserClass.class);
}
/**
* If the class implements the `Queueable` interface and the
* `execute(QueueableContext context)` does not call the
* `System.attachFinalizer(Finalizer f)` method, then add a violation.
*/
@Override
public Object visit(ASTUserClass theClass, Object data) {
if (!implementsTheQueueableInterface(theClass)) {
return data;
}
for (ASTMethod theMethod : theClass.descendants(ASTMethod.class).toList()) {
if (isTheExecuteMethodOfTheQueueableInterface(theMethod)
&& !callsTheSystemAttachFinalizerMethod(theMethod)) {
asCtx(data).addViolation(theMethod);
}
}
return data;
}
/** Determines if the class implements the Queueable interface. */
private boolean implementsTheQueueableInterface(ASTUserClass theClass) {
for (String interfaceName : theClass.getInterfaceNames()) {
if (QUEUEABLE.equalsIgnoreCase(interfaceName)) {
return true;
}
}
return false;
}
/**
* Determines if the method is the `execute(QueueableContext context)`
* method. Parameter count is checked to account for method overloading.
*/
private boolean isTheExecuteMethodOfTheQueueableInterface(ASTMethod theMethod) {
if (!EXECUTE.equalsIgnoreCase(theMethod.getCanonicalName())) {
return false;
}
List<ASTParameter> parameters = theMethod.descendants(ASTParameter.class).toList();
return parameters.size() == 1 && QUEUEABLE_CONTEXT.equalsIgnoreCase(parameters.get(0).getType());
}
/**
* Determines if the method calls the `System.attachFinalizer(Finalizer f)`
* method.
*/
private boolean callsTheSystemAttachFinalizerMethod(ASTMethod theMethod) {
for (ASTMethodCallExpression methodCallExpression : theMethod.descendants(ASTMethodCallExpression.class)
.toList()) {
if (SYSTEM_ATTACH_FINALIZER.equalsIgnoreCase(methodCallExpression.getFullMethodName())) {
return true;
}
}
return false;
}
}

52
pmd-apex/src/main/resources/category/apex/bestpractices.xml
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@ -285,4 +285,56 @@ Detects when a local variable is declared and/or assigned but not used.
</example>
</rule>
<rule name="QueueableWithoutFinalizer"
since="7.8.0"
language="apex"
message="This Queueable doesn't attach a Finalizer"
class="net.sourceforge.pmd.lang.apex.rule.bestpractices.QueueableWithoutFinalizerRule"
externalInfoUrl="${pmd.website.baseurl}/pmd_rules_apex_bestpractices.html#queueablewithoutfinalizer">
<description>
Detects when the Queueable interface is used but a Finalizer is not attached.
It is best practice to call the `System.attachFinalizer(Finalizer f)` method within the `execute` method of a class which implements the `Queueable` interface.
Without attaching a Finalizer, there is no way of designing error recovery actions should the Queueable action fail.
</description>
<priority>5</priority>
<example>
<![CDATA[
// Incorrect code, does not attach a finalizer.
public class UserUpdater implements Queueable {
public List<User> usersToUpdate;
public UserUpdater(List<User> usersToUpdate) {
this.usersToUpdate = usersToUpdate;
}
public void execute(QueueableContext context) { // no Finalizer is attached
update usersToUpdate;
}
}
// Proper code, attaches a finalizer.
public class UserUpdater implements Queueable, Finalizer {
public List<User> usersToUpdate;
public UserUpdater(List<User> usersToUpdate) {
this.usersToUpdate = usersToUpdate;
}
public void execute(QueueableContext context) {
System.attachFinalizer(this);
update usersToUpdate;
}
public void execute(FinalizerContext ctx) {
if (ctx.getResult() == ParentJobResult.SUCCESS) {
// Handle success
} else {
// Handle failure
}
}
}
]]>
</example>
</rule>
</ruleset>

1
pmd-apex/src/main/resources/rulesets/apex/quickstart.xml
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@ -209,6 +209,7 @@
<priority>3</priority>
</rule>
<!-- <rule ref="category/apex/bestpractices.xml/UnusedLocalVariable"/> -->
<!-- <rule ref="category/apex/bestpractices.xml/QueueableWithoutFinalizer"/> -->
<!-- <rule ref="category/apex/errorprone.xml/OverrideBothEqualsAndHashcode" /> -->
<!-- <rule ref="category/apex/errorprone.xml/InaccessibleAuraEnabledGetter" /> -->

11
pmd-apex/src/test/java/net/sourceforge/pmd/lang/apex/rule/bestpractices/QueueableWithoutFinalizerTest.java Normal file
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@ -0,0 +1,11 @@
/*
* BSD-style license; for more info see http://pmd.sourceforge.net/license.html
*/
package net.sourceforge.pmd.lang.apex.rule.bestpractices;
import net.sourceforge.pmd.test.PmdRuleTst;
class QueueableWithoutFinalizerTest extends PmdRuleTst {
// no additional unit tests
}

51
pmd-apex/src/test/resources/net/sourceforge/pmd/lang/apex/rule/bestpractices/xml/QueueableWithoutFinalizer.xml Normal file
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@ -0,0 +1,51 @@
<?xml version="1.0" encoding="UTF-8"?>
<test-data
xmlns="http://pmd.sourceforge.net/rule-tests"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://pmd.sourceforge.net/rule-tests http://pmd.sourceforge.net/rule-tests_1_0_0.xsd">
<test-code>
<description>[apex] Queueable Without Finalizer - positive test case #5302</description>
<expected-problems>1</expected-problems>
<expected-linenumbers>8</expected-linenumbers>
<code><![CDATA[
public class UserUpdater implements Queueable {
public List<User> usersToUpdate;
public UserUpdater(List<User> usersToUpdate) {
this.usersToUpdate = usersToUpdate;
}
public void execute(QueueableContext context) {
update usersToUpdate;
}
}
]]></code>
</test-code>
<test-code>
<description>[apex] Queueable Without Finalizer - negative test case #5302</description>
<expected-problems>0</expected-problems>
<code><![CDATA[
public class UserUpdater implements Queueable, Finalizer {
public List<User> usersToUpdate;
public UserUpdater(List<User> usersToUpdate) {
this.usersToUpdate = usersToUpdate;
}
public void execute(QueueableContext context) {
System.attachFinalizer(this);
update usersToUpdate;
}
public void execute(FinalizerContext ctx) {
if (ctx.getResult() == ParentJobResult.SUCCESS) {
// Handle success
} else {
// Handle failure
}
}
}
]]></code>
</test-code>
</test-data>