[
https://issues.apache.org/jira/browse/SLING-8104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16694497#comment-16694497
]
ASF GitHub Bot commented on SLING-8104:
---------------------------------------
bosschaert closed pull request #9: SLING-8104 Avoid magic when merging features
URL: https://github.com/apache/sling-org-apache-sling-feature/pull/9
This is a PR merged from a forked repository.
As GitHub hides the original diff on merge, it is displayed below for
the sake of provenance:
As this is a foreign pull request (from a fork), the diff is supplied
below (as it won't show otherwise due to GitHub magic):
diff --git a/src/main/java/org/apache/sling/feature/builder/BuilderContext.java
b/src/main/java/org/apache/sling/feature/builder/BuilderContext.java
index 1dd100c..61acba5 100644
--- a/src/main/java/org/apache/sling/feature/builder/BuilderContext.java
+++ b/src/main/java/org/apache/sling/feature/builder/BuilderContext.java
@@ -29,10 +29,6 @@
*/
public class BuilderContext {
- enum ArtifactMergeAlgorithm {
- LATEST, HIGHEST
- }
-
/** The required feature provider */
private final FeatureProvider provider;
@@ -42,10 +38,10 @@
private final Map<String, Map<String,String>> extensionConfiguration = new
HashMap<>();
private final List<MergeHandler> mergeExtensions = new ArrayList<>();
private final List<PostProcessHandler> postProcessExtensions = new
ArrayList<>();
+ private final List<String> artifactsOverrides = new ArrayList<>();
private final Map<String,String> variables = new HashMap<>();
private final Map<String,String> frameworkProperties = new HashMap<>();
- private ArtifactMergeAlgorithm merge = ArtifactMergeAlgorithm.HIGHEST;
/**
* Create a new context
@@ -72,27 +68,38 @@ public BuilderContext setArtifactProvider(final
ArtifactProvider ap) {
}
/**
- * Add overwrites for the variables
+ * Add overrides for the variables
*
- * @param vars The overwrites
+ * @param vars The overrides
* @return The builder context
*/
- public BuilderContext addVariablesOverwrites(final Map<String,String>
vars) {
+ public BuilderContext addVariablesOverrides(final Map<String,String> vars)
{
this.variables.putAll(vars);
return this;
}
/**
- * Add overwrites for the framework properties
+ * Add overrides for the framework properties
*
- * @param props The overwrites
+ * @param props The overrides
* @return The builder context
*/
- public BuilderContext addFrameworkPropertiesOverwrites(final
Map<String,String> props) {
+ public BuilderContext addFrameworkPropertiesOverrides(final
Map<String,String> props) {
this.frameworkProperties.putAll(props);
return this;
}
+ /**
+ * Add overrides for artifact clashes
+ *
+ * @param overrides The overrides
+ * @return The builder context
+ */
+ public BuilderContext addArtifactsOverrides(final List<String> overrides) {
+ this.artifactsOverrides.addAll(overrides);
+ return this;
+ }
+
/**
* Add merge extensions
*
@@ -115,17 +122,6 @@ public BuilderContext addPostProcessExtensions(final
PostProcessHandler... exten
return this;
}
- /**
- * Set the merge algorithm
- *
- * @param alg The algorithm
- * @return The builder context
- */
- public BuilderContext setMergeAlgorithm(final ArtifactMergeAlgorithm alg) {
- this.merge = alg;
- return this;
- }
-
/**
* Set a handler configuration
*
@@ -152,11 +148,15 @@ ArtifactProvider getArtifactProvider() {
return this.artifactProvider;
}
- Map<String,String> getVariablesOverwrites() {
- return this.variables;
+ List<String> getArtifactOverrides() {
+ return this.artifactsOverrides;
+ }
+
+ Map<String,String> getVariablesOverrides() {
+ return this.variables;
}
- Map<String,String> getFrameworkPropertiesOverwrites() {
+ Map<String,String> getFrameworkPropertiesOverrides() {
return this.frameworkProperties;
}
@@ -168,10 +168,6 @@ FeatureProvider getFeatureProvider() {
return this.provider;
}
- ArtifactMergeAlgorithm getMergeAlgorithm() {
- return this.merge;
- }
-
/**
* Get the list of merge extensions
* @return The list of merge extensions
@@ -196,11 +192,11 @@ ArtifactMergeAlgorithm getMergeAlgorithm() {
BuilderContext clone(final FeatureProvider featureProvider) {
final BuilderContext ctx = new BuilderContext(featureProvider);
ctx.setArtifactProvider(this.artifactProvider);
+ ctx.artifactsOverrides.addAll(this.artifactsOverrides);
ctx.variables.putAll(this.variables);
ctx.frameworkProperties.putAll(this.frameworkProperties);
ctx.mergeExtensions.addAll(mergeExtensions);
ctx.postProcessExtensions.addAll(postProcessExtensions);
- ctx.merge = this.merge;
return ctx;
}
}
diff --git a/src/main/java/org/apache/sling/feature/builder/BuilderUtil.java
b/src/main/java/org/apache/sling/feature/builder/BuilderUtil.java
index 4dd5b82..6399487 100644
--- a/src/main/java/org/apache/sling/feature/builder/BuilderUtil.java
+++ b/src/main/java/org/apache/sling/feature/builder/BuilderUtil.java
@@ -16,9 +16,22 @@
*/
package org.apache.sling.feature.builder;
+import org.apache.sling.feature.Artifact;
+import org.apache.sling.feature.Bundles;
+import org.apache.sling.feature.Configuration;
+import org.apache.sling.feature.Configurations;
+import org.apache.sling.feature.Extension;
+import org.apache.sling.feature.Feature;
+import org.apache.sling.feature.FeatureConstants;
+import org.osgi.framework.Version;
+import org.osgi.resource.Capability;
+import org.osgi.resource.Requirement;
+
import java.io.StringReader;
import java.io.StringWriter;
import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
@@ -35,21 +48,11 @@
import javax.json.JsonValue.ValueType;
import javax.json.JsonWriter;
-import org.apache.sling.feature.Artifact;
-import org.apache.sling.feature.Bundles;
-import org.apache.sling.feature.Configuration;
-import org.apache.sling.feature.Configurations;
-import org.apache.sling.feature.Extension;
-import org.apache.sling.feature.Feature;
-import org.apache.sling.feature.FeatureConstants;
-import org.apache.sling.feature.builder.BuilderContext.ArtifactMergeAlgorithm;
-import org.osgi.resource.Capability;
-import org.osgi.resource.Requirement;
-
/**
* Utility methods for the builders
*/
class BuilderUtil {
+ static final String CATCHALL_OVERRIDE = "*:*:";
static boolean contains(String key, Iterable<Map.Entry<String, String>>
iterable) {
if (iterable != null) {
@@ -73,7 +76,7 @@ static String get(String key, Iterable<Map.Entry<String,
String>> iterable) {
return null;
}
- private static void mergeWithContextOverwrite(String type,
Map<String,String> target, Map<String,String> source,
Iterable<Map.Entry<String,String>> context) {
+ private static void mergeWithContextOverride(String type,
Map<String,String> target, Map<String,String> source,
Iterable<Map.Entry<String,String>> context) {
Map<String,String> result = new HashMap<>();
for (Map.Entry<String, String> entry : target.entrySet()) {
result.put(entry.getKey(), contains(entry.getKey(), context) ?
get(entry.getKey(), context) : entry.getValue());
@@ -88,7 +91,7 @@ private static void mergeWithContextOverwrite(String type,
Map<String,String> ta
String targetValue = target.get(entry.getKey());
if (targetValue != null) {
if (!value.equals(targetValue)) {
- throw new
IllegalStateException(String.format("Can't merge %s '%s' defined twice (as '%s'
v.s. '%s') and not overwritten.", type, entry.getKey(), value, targetValue));
+ throw new
IllegalStateException(String.format("Can't merge %s '%s' defined twice (as '%s'
v.s. '%s') and not overridden.", type, entry.getKey(), value, targetValue));
}
}
else {
@@ -106,8 +109,8 @@ else if (!contains(entry.getKey(), target.entrySet())) {
// variables
static void mergeVariables(Map<String,String> target, Map<String,String>
source, BuilderContext context) {
- mergeWithContextOverwrite("Variable", target, source,
- (null != context) ?
context.getVariablesOverwrites().entrySet() : null);
+ mergeWithContextOverride("Variable", target, source,
+ (null != context) ? context.getVariablesOverrides().entrySet()
: null);
}
/**
@@ -115,32 +118,40 @@ static void mergeVariables(Map<String,String> target,
Map<String,String> source,
*
* @param target The target bundles
* @param source The source bundles
- * @param originatingFeature Optional, if set origin will be recorded
+ * @param sourceFeature Optional, if set origin will be recorded
* @param artifactMergeAlg Algorithm used to merge the artifacts
*/
static void mergeBundles(final Bundles target,
final Bundles source,
- final Feature originatingFeature,
- final ArtifactMergeAlgorithm artifactMergeAlg) {
+ final Feature sourceFeature,
+ final List<String> artifactOverrides) {
for(final Map.Entry<Integer, List<Artifact>> entry :
source.getBundlesByStartOrder().entrySet()) {
for(final Artifact a : entry.getValue()) {
- // version handling - use provided algorithm
- boolean replace = true;
- if (artifactMergeAlg == ArtifactMergeAlgorithm.HIGHEST) {
- final Artifact existing = target.getSame(a.getId());
- if ( existing != null &&
existing.getId().getOSGiVersion().compareTo(a.getId().getOSGiVersion()) > 0 ) {
- replace = false;
+ Artifact existing = target.getSame(a.getId());
+ List<Artifact> selectedArtifacts = null;
+ if (existing != null) {
+ if (sourceFeature.getId().toMvnId().equals(
+
existing.getMetadata().get(FeatureConstants.ARTIFACT_ATTR_ORIGINAL_FEATURE))) {
+ // If the source artifact came from the same feature,
keep them side-by-side
+ selectedArtifacts = Arrays.asList(existing, a);
+ } else {
+ selectedArtifacts = selectArtifactOverride(existing,
a, artifactOverrides);
+ while(target.removeSame(existing.getId())) {
+ // Keep executing removeSame() which ignores the
version until last one was removed
+ }
}
+ } else {
+ selectedArtifacts = Collections.singletonList(a);
}
- if ( replace ) {
- target.removeSame(a.getId());
+
+ for (Artifact sa : selectedArtifacts) {
// create a copy to detach artifact from source
- final Artifact cp = a.copy(a.getId());
+ final Artifact cp = sa.copy(sa.getId());
// Record the original feature of the bundle
- if (originatingFeature != null
- &&
a.getMetadata().get(FeatureConstants.ARTIFACT_ATTR_ORIGINAL_FEATURE) == null) {
+ if (sourceFeature != null && source.contains(sa)
+ &&
sa.getMetadata().get(FeatureConstants.ARTIFACT_ATTR_ORIGINAL_FEATURE) == null) {
cp.getMetadata().put(FeatureConstants.ARTIFACT_ATTR_ORIGINAL_FEATURE,
- originatingFeature.getId().toMvnId());
+ sourceFeature.getId().toMvnId());
}
target.add(cp);
}
@@ -148,6 +159,51 @@ static void mergeBundles(final Bundles target,
}
}
+ static List<Artifact> selectArtifactOverride(Artifact a1, Artifact a2,
List<String> artifactOverrides) {
+ if (a1.getId().equals(a2.getId())) {
+ // They're the same so return one of them
+ return Collections.singletonList(a2);
+ }
+
+ String a1gid = a1.getId().getGroupId();
+ String a1aid = a1.getId().getArtifactId();
+ String a2gid = a2.getId().getGroupId();
+ String a2aid = a2.getId().getArtifactId();
+
+ if (!a1gid.equals(a2gid))
+ throw new IllegalStateException("Artifacts must have the same
group ID: " + a1 + " and " + a2);
+ if (!a1aid.equals(a2aid))
+ throw new IllegalStateException("Artifacts must have the same
artifact ID: " + a1 + " and " + a2);
+
+ String prefix = a1gid + ":" + a1aid + ":";
+ for (String o : artifactOverrides) {
+ if (o.startsWith(prefix) || o.startsWith(CATCHALL_OVERRIDE)) {
+ int idx = o.lastIndexOf(':');
+ if (idx <= 0 || o.length() <= idx)
+ continue;
+
+ String rule = o.substring(idx+1).trim();
+
+ if ("ALL".equals(rule)) {
+ return Arrays.asList(a1, a2);
+ } else if ("HIGHEST".equals(rule)) {
+ Version a1v = a1.getId().getOSGiVersion();
+ Version a2v = a2.getId().getOSGiVersion();
+ return a1v.compareTo(a2v) > 0 ?
Collections.singletonList(a1) : Collections.singletonList(a2);
+ } else if ("LATEST".equals(rule)) {
+ return Collections.singletonList(a2);
+ } else if (a1.getId().getVersion().equals(rule)) {
+ return Collections.singletonList(a1);
+ } else if (a2.getId().getVersion().equals(rule)) {
+ return Collections.singletonList(a2);
+ }
+ throw new IllegalStateException("Override rule " + o + " not
applicable to artifacts " + a1 + " and " + a2);
+ }
+ }
+ throw new IllegalStateException("Artifact override rule required to
select between these two artifacts " +
+ a1 + " and " + a2);
+ }
+
// configurations - merge / override
static void mergeConfigurations(final Configurations target, final
Configurations source, final Feature origin) {
for(final Configuration cfg : source) {
@@ -181,8 +237,8 @@ static void mergeConfigurations(final Configurations
target, final Configuration
// framework properties (add/merge)
static void mergeFrameworkProperties(final Map<String,String> target,
final Map<String,String> source, BuilderContext context) {
- mergeWithContextOverwrite("Property", target, source,
- context != null ?
context.getFrameworkPropertiesOverwrites().entrySet() : null);
+ mergeWithContextOverride("Property", target, source,
+ context != null ?
context.getFrameworkPropertiesOverrides().entrySet() : null);
}
// requirements (add)
@@ -208,13 +264,13 @@ static void mergeCapabilities(final List<Capability>
target, final List<Capabili
*
* @param target The target extension
* @param source The source extension
- * @param originatingFeature Optional, if set origin will be recorded for
- * artifacts
+ * @param originatingFeature Optional, if set origin will be recorded for
artifacts
* @param artifactMergeAlg The merge algorithm for artifacts
*/
static void mergeExtensions(final Extension target,
- final Extension source, final Feature originatingFeature,
- final ArtifactMergeAlgorithm artifactMergeAlg) {
+ final Extension source,
+ final Feature sourceFeature,
+ final List<String> artifactOverrides) {
switch ( target.getType() ) {
case TEXT : // simply append
target.setText(target.getText() + "\n" + source.getText());
@@ -254,25 +310,32 @@ static void mergeExtensions(final Extension target,
break;
case ARTIFACTS:
- for (final Artifact a : source.getArtifacts()) {
- // use artifactMergeAlg
- boolean replace = true;
- if (artifactMergeAlg == ArtifactMergeAlgorithm.HIGHEST) {
- final Artifact existing =
target.getArtifacts().getSame(a.getId());
- if (existing != null
- &&
existing.getId().getOSGiVersion().compareTo(a.getId().getOSGiVersion()) > 0) {
- replace = false;
+ for(final Artifact a : source.getArtifacts()) {
+ Artifact existing = target.getArtifacts().getSame(a.getId());
+ List<Artifact> selectedArtifacts = null;
+ if (existing != null) {
+ if (sourceFeature.getId().toMvnId().equals(
+
existing.getMetadata().get(FeatureConstants.ARTIFACT_ATTR_ORIGINAL_FEATURE))) {
+ // If the source artifact came from the same feature,
keep them side-by-side
+ selectedArtifacts = Arrays.asList(existing, a);
+ } else {
+ selectedArtifacts = selectArtifactOverride(existing,
a, artifactOverrides);
+
while(target.getArtifacts().removeSame(existing.getId())) {
+ // Keep executing removeSame() which ignores the
version until last one was removed
+ }
}
+ } else {
+ selectedArtifacts = Collections.singletonList(a);
}
- if (replace) {
- target.getArtifacts().removeSame(a.getId());
+
+ for (Artifact sa : selectedArtifacts) {
// create a copy to detach artifact from source
- final Artifact cp = a.copy(a.getId());
- // Record the original feature of the artifact
- if (originatingFeature != null
- &&
a.getMetadata().get(FeatureConstants.ARTIFACT_ATTR_ORIGINAL_FEATURE) == null) {
+ final Artifact cp = sa.copy(sa.getId());
+ // Record the original feature of the bundle
+ if (sourceFeature != null &&
source.getArtifacts().contains(sa)
+ &&
sa.getMetadata().get(FeatureConstants.ARTIFACT_ATTR_ORIGINAL_FEATURE) == null) {
cp.getMetadata().put(FeatureConstants.ARTIFACT_ATTR_ORIGINAL_FEATURE,
- originatingFeature.getId().toMvnId());
+ sourceFeature.getId().toMvnId());
}
target.getArtifacts().add(cp);
}
@@ -284,7 +347,8 @@ static void mergeExtensions(final Extension target,
// extensions (add/merge)
static void mergeExtensions(final Feature target,
final Feature source,
- final ArtifactMergeAlgorithm artifactMergeAlg, final
BuilderContext context, final boolean recordOrigin) {
+ final BuilderContext context,
+ final List<String> artifactOverrides) {
for(final Extension ext : source.getExtensions()) {
boolean found = false;
@@ -306,7 +370,7 @@ static void mergeExtensions(final Feature target,
}
if ( !handled ) {
// default merge
- mergeExtensions(current, ext, recordOrigin ? source :
null, artifactMergeAlg);
+ mergeExtensions(current, ext, source,
artifactOverrides);
}
}
}
diff --git a/src/main/java/org/apache/sling/feature/builder/FeatureBuilder.java
b/src/main/java/org/apache/sling/feature/builder/FeatureBuilder.java
index f844443..f079b19 100644
--- a/src/main/java/org/apache/sling/feature/builder/FeatureBuilder.java
+++ b/src/main/java/org/apache/sling/feature/builder/FeatureBuilder.java
@@ -16,16 +16,6 @@
*/
package org.apache.sling.feature.builder;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.HashSet;
-import java.util.Iterator;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
-
import org.apache.sling.feature.Artifact;
import org.apache.sling.feature.ArtifactId;
import org.apache.sling.feature.Configuration;
@@ -36,6 +26,17 @@
import org.apache.sling.feature.Include;
import org.osgi.framework.Version;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Dictionary;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
public abstract class FeatureBuilder {
/** Pattern for using variables. */
@@ -195,7 +196,7 @@ public static Feature assemble(
}
usedFeatures.add(assembled.getId());
- merge(target, assembled, context, context.getMergeAlgorithm(),
true);
+ merge(target, assembled, context, context.getArtifactOverrides());
}
// append feature list in extension
@@ -323,10 +324,14 @@ private static Feature internalAssemble(final
List<String> processedFeatures,
// process include instructions
processInclude(includedFeature, i);
- // and now merge
- merge(result, includedFeature, context,
BuilderContext.ArtifactMergeAlgorithm.LATEST, true);
+ // and now merge the included feature into the result. No
overrides should be needed since the result is empty before
+ merge(result, includedFeature, context, Collections.emptyList());
+
+ // and merge the current feature over the included feature into
the result
+ merge(result, feature, context,
Collections.singletonList("*:*:LATEST"));
- merge(result, feature, context,
BuilderContext.ArtifactMergeAlgorithm.LATEST, false);
+ // set the origin of the artifacts and configurations included and
part of the resulting feature back to null
+ resetOrigins(result, includedFeature);
}
result.setAssembled(true);
@@ -339,18 +344,14 @@ private static Feature internalAssemble(final
List<String> processedFeatures,
private static void merge(final Feature target,
final Feature source,
final BuilderContext context,
- final BuilderContext.ArtifactMergeAlgorithm mergeAlg, final
boolean recordOrigin) {
+ final List<String> artifactOverrides) {
BuilderUtil.mergeVariables(target.getVariables(),
source.getVariables(), context);
- BuilderUtil.mergeBundles(target.getBundles(), source.getBundles(),
recordOrigin ? source : null, mergeAlg);
- BuilderUtil.mergeConfigurations(target.getConfigurations(),
source.getConfigurations(),
- recordOrigin ? source : null);
+ BuilderUtil.mergeBundles(target.getBundles(), source.getBundles(),
source, artifactOverrides);
+ BuilderUtil.mergeConfigurations(target.getConfigurations(),
source.getConfigurations(), source);
BuilderUtil.mergeFrameworkProperties(target.getFrameworkProperties(),
source.getFrameworkProperties(), context);
BuilderUtil.mergeRequirements(target.getRequirements(),
source.getRequirements());
BuilderUtil.mergeCapabilities(target.getCapabilities(),
source.getCapabilities());
- BuilderUtil.mergeExtensions(target,
- source,
- mergeAlg,
- context, recordOrigin);
+ BuilderUtil.mergeExtensions(target, source, context,
artifactOverrides);
}
/**
@@ -466,4 +467,34 @@ private static void processInclude(final Feature feature,
final Include include)
}
}
}
+
+ // Set the origin of elements coming from an included feature to the
target feature
+ private static void resetOrigins(Feature feature, Feature includedFeature)
{
+ String currentID = feature.getId().toMvnId();
+ String includedID = includedFeature.getId().toMvnId();
+
+ // As the feature is a prototype, set the origins to the target where
it's going to
+ for (Artifact a : feature.getBundles()) {
+ Map<String, String> md = a.getMetadata();
+ if
(currentID.equals(md.get(FeatureConstants.ARTIFACT_ATTR_ORIGINAL_FEATURE))
+ ||
includedID.equals(md.get(FeatureConstants.ARTIFACT_ATTR_ORIGINAL_FEATURE)))
+ md.remove(FeatureConstants.ARTIFACT_ATTR_ORIGINAL_FEATURE);
+ }
+ for (Configuration c : feature.getConfigurations()) {
+ Dictionary<String, Object> props = c.getProperties();
+ if
(currentID.equals(props.get(Configuration.PROP_ORIGINAL__FEATURE))
+ ||
includedID.equals(props.get(Configuration.PROP_ORIGINAL__FEATURE)))
+ props.remove(Configuration.PROP_ORIGINAL__FEATURE);
+ }
+ for (Extension e : feature.getExtensions()) {
+ if (ExtensionType.ARTIFACTS == e.getType()) {
+ for (Artifact a : e.getArtifacts()) {
+ Map<String, String> md = a.getMetadata();
+ if
(currentID.equals(md.get(FeatureConstants.ARTIFACT_ATTR_ORIGINAL_FEATURE))
+ ||
includedID.equals(md.get(FeatureConstants.ARTIFACT_ATTR_ORIGINAL_FEATURE)))
+
md.remove(FeatureConstants.ARTIFACT_ATTR_ORIGINAL_FEATURE);
+ }
+ }
+ }
+ }
}
diff --git
a/src/test/java/org/apache/sling/feature/builder/BuilderUtilTest.java
b/src/test/java/org/apache/sling/feature/builder/BuilderUtilTest.java
index 5fd187d..23f3338 100644
--- a/src/test/java/org/apache/sling/feature/builder/BuilderUtilTest.java
+++ b/src/test/java/org/apache/sling/feature/builder/BuilderUtilTest.java
@@ -22,7 +22,6 @@
import org.apache.sling.feature.Extension;
import org.apache.sling.feature.ExtensionType;
import org.apache.sling.feature.Feature;
-import org.apache.sling.feature.builder.BuilderContext.ArtifactMergeAlgorithm;
import org.junit.Test;
import org.mockito.Mockito;
@@ -30,6 +29,7 @@
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.Arrays;
+import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
@@ -105,7 +105,8 @@ private int assertContains(final List<Map.Entry<Integer,
Artifact>> bundles,
final Feature orgFeat = new Feature(new ArtifactId("gid", "aid",
"123", null, null));
- BuilderUtil.mergeBundles(target, source, orgFeat,
ArtifactMergeAlgorithm.HIGHEST);
+ List<String> overrides = Arrays.asList("g:a:HIGHEST", "g:b:HIGHEST");
+ BuilderUtil.mergeBundles(target, source, orgFeat, overrides);
final List<Map.Entry<Integer, Artifact>> result = getBundles(target);
assertEquals(3, result.size());
@@ -133,7 +134,8 @@ private int assertContains(final List<Map.Entry<Integer,
Artifact>> bundles,
final Feature orgFeat = new Feature(new ArtifactId("gid", "aid",
"123", null, null));
- BuilderUtil.mergeBundles(target, source, orgFeat,
ArtifactMergeAlgorithm.LATEST);
+ List<String> overrides = Arrays.asList("g:a:LATEST", "g:b:LATEST");
+ BuilderUtil.mergeBundles(target, source, orgFeat, overrides);
final List<Map.Entry<Integer, Artifact>> result = getBundles(target);
assertEquals(3, result.size());
@@ -151,7 +153,8 @@ private int assertContains(final List<Map.Entry<Integer,
Artifact>> bundles,
source.add(createBundle("g/a/1.1", 2));
final Feature orgFeat = new Feature(new ArtifactId("gid", "aid",
"123", null, null));
- BuilderUtil.mergeBundles(target, source, orgFeat,
ArtifactMergeAlgorithm.LATEST);
+ List<String> overrides = Arrays.asList("g:a:LATEST", "g:b:LATEST");
+ BuilderUtil.mergeBundles(target, source, orgFeat, overrides);
final List<Map.Entry<Integer, Artifact>> result = getBundles(target);
assertEquals(1, result.size());
@@ -171,7 +174,7 @@ private int assertContains(final List<Map.Entry<Integer,
Artifact>> bundles,
source.add(createBundle("g/f/2.5", 3));
final Feature orgFeat = new Feature(new ArtifactId("gid", "aid",
"123", null, null));
- BuilderUtil.mergeBundles(target, source, orgFeat,
ArtifactMergeAlgorithm.LATEST);
+ BuilderUtil.mergeBundles(target, source, orgFeat, new ArrayList<>());
final List<Map.Entry<Integer, Artifact>> result = getBundles(target);
assertEquals(6, result.size());
@@ -191,11 +194,11 @@ private int assertContains(final List<Map.Entry<Integer,
Artifact>> bundles,
source.add(createBundle("g/b/1.0", 1));
final Feature orgFeat = new Feature(new ArtifactId("gid", "aid",
"123", "c1", "slingfeature"));
- BuilderUtil.mergeBundles(target, source, orgFeat,
ArtifactMergeAlgorithm.LATEST);
+ BuilderUtil.mergeBundles(target, source, orgFeat, new ArrayList<>());
final Bundles target2 = new Bundles();
final Feature orgFeat2 = new Feature(new ArtifactId("g", "a", "1",
null, null));
- BuilderUtil.mergeBundles(target2, target, orgFeat2,
ArtifactMergeAlgorithm.LATEST);
+ BuilderUtil.mergeBundles(target2, target, orgFeat2, new ArrayList<>());
List<Entry<Integer, Artifact>> result = getBundles(target2);
assertEquals(2, result.size());
@@ -214,7 +217,7 @@ private int assertContains(final List<Map.Entry<Integer,
Artifact>> bundles,
source.setJSON("[\"source1\",\"source2\"]");
- BuilderUtil.mergeExtensions(target, source, null,
ArtifactMergeAlgorithm.HIGHEST);
+ BuilderUtil.mergeExtensions(target, source, null, new ArrayList<>());
assertEquals(target.getJSON(),
"[\"target1\",\"target2\",\"source1\",\"source2\"]");
@@ -306,7 +309,7 @@ static void copyJsonObject(JsonObject obj, JsonGenerator
gen, String ... exclusi
Feature ft = new Feature(ArtifactId.fromMvnId("g:t:1"));
assertEquals("Precondition", 0, ft.getExtensions().size());
- BuilderUtil.mergeExtensions(ft, fs, ArtifactMergeAlgorithm.LATEST,
ctx, true);
+ BuilderUtil.mergeExtensions(ft, fs, ctx, new ArrayList<>());
assertEquals(1, ft.getExtensions().size());
Extension actual = ft.getExtensions().get(0);
@@ -330,7 +333,7 @@ static void copyJsonObject(JsonObject obj, JsonGenerator
gen, String ... exclusi
ft.getExtensions().add(et);
assertEquals("Precondition", 1, ft.getExtensions().size());
- BuilderUtil.mergeExtensions(ft, fs, ArtifactMergeAlgorithm.LATEST,
ctx, true);
+ BuilderUtil.mergeExtensions(ft, fs, ctx, new ArrayList<>());
assertEquals(1, ft.getExtensions().size());
Extension actual = ft.getExtensions().get(0);
@@ -357,7 +360,7 @@ static void copyJsonObject(JsonObject obj, JsonGenerator
gen, String ... exclusi
Feature ft = new Feature(ArtifactId.fromMvnId("g:t:1"));
assertEquals("Precondition", 0, ft.getExtensions().size());
- BuilderUtil.mergeExtensions(ft, fs, ArtifactMergeAlgorithm.LATEST,
ctx, true);
+ BuilderUtil.mergeExtensions(ft, fs, ctx, new ArrayList<>());
assertEquals(1, ft.getExtensions().size());
Extension actual = ft.getExtensions().get(0);
@@ -382,7 +385,7 @@ static void copyJsonObject(JsonObject obj, JsonGenerator
gen, String ... exclusi
ft.getExtensions().add(et);
assertEquals("Precondition", 1, ft.getExtensions().size());
- BuilderUtil.mergeExtensions(ft, fs, ArtifactMergeAlgorithm.LATEST,
ctx, true);
+ BuilderUtil.mergeExtensions(ft, fs, ctx, new ArrayList<>());
assertEquals(1, ft.getExtensions().size());
Extension actual = ft.getExtensions().get(0);
@@ -393,6 +396,80 @@ static void copyJsonObject(JsonObject obj, JsonGenerator
gen, String ... exclusi
assertEquals(er.readObject(), ar.readObject());
}
+ @Test public void testSelectArtifactOverrideAll() {
+ Artifact a1 = new Artifact(ArtifactId.fromMvnId("gid:aid:1"));
+ Artifact a2 = new Artifact(ArtifactId.fromMvnId("gid:aid:2"));
+ List<String> overrides = Arrays.asList("gid:aid2:1", "gid:aid:ALL ");
+ assertEquals(Arrays.asList(a1, a2),
BuilderUtil.selectArtifactOverride(a1, a2, overrides));
+ }
+
+ @Test public void testSelectArtifactOverrideIdenticalNeedsNoRule() {
+ Artifact a1 = new Artifact(ArtifactId.fromMvnId("gid:aid:1"));
+ Artifact a2 = new Artifact(ArtifactId.fromMvnId("gid:aid:1"));
+ assertEquals(Collections.singletonList(a1),
BuilderUtil.selectArtifactOverride(a1, a2, Collections.emptyList()));
+ }
+
+ @Test public void testSelectArtifactOverride1() {
+ Artifact a1 = new Artifact(ArtifactId.fromMvnId("gid:aid:1"));
+ Artifact a2 = new Artifact(ArtifactId.fromMvnId("gid:aid:2"));
+ List<String> overrides = Collections.singletonList("gid:aid:1");
+ assertEquals(Collections.singletonList(a1),
BuilderUtil.selectArtifactOverride(a1, a2, overrides));
+ }
+
+ @Test public void testSelectArtifactOverride2() {
+ Artifact a1 = new Artifact(ArtifactId.fromMvnId("gid:aid:1"));
+ Artifact a2 = new Artifact(ArtifactId.fromMvnId("gid:aid:2"));
+ List<String> overrides = Collections.singletonList("gid:aid:2");
+ assertEquals(Collections.singletonList(a2),
BuilderUtil.selectArtifactOverride(a1, a2, overrides));
+ }
+
+ @Test(expected=IllegalStateException.class)
+ public void testSelectArtifactOverride3() {
+ Artifact a1 = new Artifact(ArtifactId.fromMvnId("gid:aid:1"));
+ Artifact a2 = new Artifact(ArtifactId.fromMvnId("gid:aid:2"));
+ List<String> overrides = Collections.singletonList("gid:aid:3");
+ BuilderUtil.selectArtifactOverride(a1, a2, overrides);
+ }
+
+ @Test(expected=IllegalStateException.class)
+ public void testSelectArtifactOverrideDifferentGroupID() {
+ Artifact a1 = new Artifact(ArtifactId.fromMvnId("aid:aid:1"));
+ Artifact a2 = new Artifact(ArtifactId.fromMvnId("gid:aid:2"));
+ List<String> overrides = Collections.singletonList("gid:aid:2");
+ BuilderUtil.selectArtifactOverride(a1, a2, overrides);
+ }
+
+ @Test(expected=IllegalStateException.class)
+ public void testSelectArtifactOverrideDifferentArtifactID() {
+ Artifact a1 = new Artifact(ArtifactId.fromMvnId("gid:gid:1"));
+ Artifact a2 = new Artifact(ArtifactId.fromMvnId("gid:aid:2"));
+ List<String> overrides = Collections.singletonList("gid:aid:2");
+ BuilderUtil.selectArtifactOverride(a1, a2, overrides);
+ }
+
+ @Test(expected=IllegalStateException.class)
+ public void testSelectArtifactOverrideDifferentNoRule() {
+ Artifact a1 = new Artifact(ArtifactId.fromMvnId("gid:aid:1"));
+ Artifact a2 = new Artifact(ArtifactId.fromMvnId("gid:aid:2"));
+ BuilderUtil.selectArtifactOverride(a1, a2, Collections.emptyList());
+ }
+
+ @Test public void testSelectArtifactOverrideHigest() {
+ Artifact a1 = new Artifact(ArtifactId.fromMvnId("gid:aid:1.1"));
+ Artifact a2 = new Artifact(ArtifactId.fromMvnId("gid:aid:2.0.1"));
+ List<String> overrides = Collections.singletonList("gid:aid:HIGHEST");
+ assertEquals(Collections.singletonList(a2),
BuilderUtil.selectArtifactOverride(a1, a2, overrides));
+ assertEquals(Collections.singletonList(a2),
BuilderUtil.selectArtifactOverride(a2, a1, overrides));
+ }
+
+ @Test public void testSelectArtifactOverrideLatest() {
+ Artifact a1 = new Artifact(ArtifactId.fromMvnId("gid:aid:1.1"));
+ Artifact a2 = new Artifact(ArtifactId.fromMvnId("gid:aid:2.0.1"));
+ List<String> overrides = Collections.singletonList("gid:aid:LATEST");
+ assertEquals(Collections.singletonList(a2),
BuilderUtil.selectArtifactOverride(a1, a2, overrides));
+ assertEquals(Collections.singletonList(a1),
BuilderUtil.selectArtifactOverride(a2, a1, overrides));
+ }
+
@SafeVarargs
public static Artifact createBundle(final String id, final int startOrder,
Map.Entry<String, String> ... metadata) {
final Artifact a = new Artifact(ArtifactId.parse(id));
diff --git
a/src/test/java/org/apache/sling/feature/builder/FeatureBuilderTest.java
b/src/test/java/org/apache/sling/feature/builder/FeatureBuilderTest.java
index 91c6235..b81a7f2 100644
--- a/src/test/java/org/apache/sling/feature/builder/FeatureBuilderTest.java
+++ b/src/test/java/org/apache/sling/feature/builder/FeatureBuilderTest.java
@@ -16,23 +16,6 @@
*/
package org.apache.sling.feature.builder;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertNull;
-import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
-
-import java.util.AbstractMap;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
-
import org.apache.felix.utils.resource.CapabilityImpl;
import org.apache.felix.utils.resource.RequirementImpl;
import org.apache.sling.feature.Artifact;
@@ -47,6 +30,22 @@
import org.osgi.resource.Capability;
import org.osgi.resource.Requirement;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
public class FeatureBuilderTest {
private static final Map<String, Feature> FEATURES = new HashMap<>();
@@ -71,6 +70,25 @@
FEATURES.put(f1.getId().toMvnId(), f1);
}
+ static {
+ final Feature f2 = new Feature(ArtifactId.parse("g/a/2"));
+
+ f2.getBundles().add(BuilderUtilTest.createBundle("group/testmulti/1",
4));
+ f2.getBundles().add(BuilderUtilTest.createBundle("group/testmulti/2",
8));
+
f2.getBundles().add(BuilderUtilTest.createBundle("group/someart/1.2.3", 4));
+
+ FEATURES.put(f2.getId().toMvnId(), f2);
+ }
+
+ static {
+ final Feature f2 = new Feature(ArtifactId.parse("g/a/3"));
+
+ f2.getBundles().add(BuilderUtilTest.createBundle("group/testmulti/2",
8));
+
f2.getBundles().add(BuilderUtilTest.createBundle("group/someart/1.2.3", 4));
+
+ FEATURES.put(f2.getId().toMvnId(), f2);
+ }
+
private final FeatureProvider provider = new FeatureProvider() {
@Override
@@ -276,16 +294,14 @@ private void equals(final Feature expected, final Feature
actuals) {
final Artifact a1 = new
Artifact(ArtifactId.parse("org.apache.sling/oak-server/1.0.0"));
a1.getMetadata().put(Artifact.KEY_START_ORDER, "1");
a1.getMetadata().put("hash", "4632463464363646436");
- a1.getMetadata().put("org-feature",
"org.apache.sling:test-feature:1.1");
base.getBundles().add(a1);
- Map.Entry<String, String> md = new AbstractMap.SimpleEntry<String,
String>("org-feature", "org.apache.sling:test-feature:1.1");
-
base.getBundles().add(BuilderUtilTest.createBundle("org.apache.sling/application-bundle/2.0.0",
1, md));
-
base.getBundles().add(BuilderUtilTest.createBundle("org.apache.sling/another-bundle/2.1.0",
1, md));
-
base.getBundles().add(BuilderUtilTest.createBundle("org.apache.sling/foo-xyz/1.2.3",
2, md));
-
base.getBundles().add(BuilderUtilTest.createBundle("group/testnewversion_low/1",
5, md));
-
base.getBundles().add(BuilderUtilTest.createBundle("group/testnewversion_high/5",
5, md));
-
base.getBundles().add(BuilderUtilTest.createBundle("group/testnewstartlevel/1",
10, md));
-
base.getBundles().add(BuilderUtilTest.createBundle("group/testnewstartlevelandversion/2",
10, md));
+
base.getBundles().add(BuilderUtilTest.createBundle("org.apache.sling/application-bundle/2.0.0",
1));
+
base.getBundles().add(BuilderUtilTest.createBundle("org.apache.sling/another-bundle/2.1.0",
1));
+
base.getBundles().add(BuilderUtilTest.createBundle("org.apache.sling/foo-xyz/1.2.3",
2));
+
base.getBundles().add(BuilderUtilTest.createBundle("group/testnewversion_low/1",
5));
+
base.getBundles().add(BuilderUtilTest.createBundle("group/testnewversion_high/5",
5));
+
base.getBundles().add(BuilderUtilTest.createBundle("group/testnewstartlevel/1",
10));
+
base.getBundles().add(BuilderUtilTest.createBundle("group/testnewstartlevelandversion/2",
10));
final Configuration co1 = new Configuration("my.pid");
co1.getProperties().put("foo", 5L);
@@ -304,11 +320,9 @@ private void equals(final Feature expected, final Feature
actuals) {
result.getVariables().put("varx", "myvalx");
result.setInclude(null);
result.getFrameworkProperties().put("bar", "X");
- Map.Entry<String, String> md2 = new AbstractMap.SimpleEntry<String,
String>("org-feature", "g:a:1");
-
result.getBundles().add(BuilderUtilTest.createBundle("org.apache.sling/foo-bar/4.5.6",
3, md2));
+
result.getBundles().add(BuilderUtilTest.createBundle("org.apache.sling/foo-bar/4.5.6",
3));
final Configuration co3 = new Configuration("org.apache.sling.foo");
co3.getProperties().put("prop", "value");
- co3.getProperties().put(Configuration.PROP_ORIGINAL__FEATURE,
i1.getId().toMvnId());
result.getConfigurations().add(co3);
// assemble
@@ -318,6 +332,103 @@ private void equals(final Feature expected, final Feature
actuals) {
equals(result, assembled);
}
+ @Test public void testSingleIncludeMultiVersion() {
+ Feature base = new Feature(ArtifactId.fromMvnId("g:tgtart:1"));
+ Include i1 = new Include(ArtifactId.fromMvnId("g:a:3"));
+ base.setInclude(i1);
+ base.getBundles().add(new Artifact(ArtifactId.fromMvnId("g:myart:1")));
+ base.getBundles().add(new
Artifact(ArtifactId.fromMvnId("group:testmulti:1")));
+ base.getBundles().add(new
Artifact(ArtifactId.fromMvnId("group:testmulti:3")));
+
+ BuilderContext builderContext = new BuilderContext(provider);
+ Feature assembled = FeatureBuilder.assemble(base, builderContext);
+
+ Feature result = new Feature(ArtifactId.parse("g:tgtart:1"));
+ Artifact b0 = new Artifact(ArtifactId.fromMvnId("g:myart:1"));
+ result.getBundles().add(b0);
+ Artifact b1 = new Artifact(ArtifactId.fromMvnId("group:testmulti:1"));
+ result.getBundles().add(b1);
+ Artifact b2 = new Artifact(ArtifactId.fromMvnId("group:testmulti:3"));
+ result.getBundles().add(b2);
+ Artifact b3 = new
Artifact(ArtifactId.fromMvnId("group:someart:1.2.3"));
+ b3.setStartOrder(4);
+ result.getBundles().add(b3);
+
+ equals(result, assembled);
+ }
+
+ @Test public void testSingleIncludeMultiVersion2() {
+ Feature base = new Feature(ArtifactId.fromMvnId("g:tgtart:1"));
+ Include i1 = new Include(ArtifactId.fromMvnId("g:a:2"));
+ base.setInclude(i1);
+ base.getBundles().add(new Artifact(ArtifactId.fromMvnId("g:myart:1")));
+
+ BuilderContext builderContext = new BuilderContext(provider);
+ Feature assembled = FeatureBuilder.assemble(base, builderContext);
+
+ Feature result = new Feature(ArtifactId.parse("g:tgtart:1"));
+ Artifact b0 = new Artifact(ArtifactId.fromMvnId("g:myart:1"));
+ result.getBundles().add(b0);
+ Artifact b1 = new Artifact(ArtifactId.fromMvnId("group:testmulti:1"));
+ b1.setStartOrder(4);
+ result.getBundles().add(b1);
+ Artifact b2 = new Artifact(ArtifactId.fromMvnId("group:testmulti:2"));
+ b2.setStartOrder(8);
+ result.getBundles().add(b2);
+ Artifact b3 = new
Artifact(ArtifactId.fromMvnId("group:someart:1.2.3"));
+ b3.setStartOrder(4);
+ result.getBundles().add(b3);
+
+ equals(result, assembled);
+ }
+
+ @Test public void testSingleIncludeMultiVersion3() {
+ Feature base = new Feature(ArtifactId.fromMvnId("g:tgtart:1"));
+ Include i1 = new Include(ArtifactId.fromMvnId("g:a:2"));
+ base.setInclude(i1);
+ base.getBundles().add(new Artifact(ArtifactId.fromMvnId("g:myart:1")));
+ base.getBundles().add(new
Artifact(ArtifactId.fromMvnId("group:testmulti:1")));
+
+ BuilderContext builderContext = new BuilderContext(provider);
+ Feature assembled = FeatureBuilder.assemble(base, builderContext);
+
+ Feature result = new Feature(ArtifactId.parse("g:tgtart:1"));
+ Artifact b0 = new Artifact(ArtifactId.fromMvnId("g:myart:1"));
+ result.getBundles().add(b0);
+ Artifact b1 = new Artifact(ArtifactId.fromMvnId("group:testmulti:1"));
+ result.getBundles().add(b1);
+ Artifact b3 = new
Artifact(ArtifactId.fromMvnId("group:someart:1.2.3"));
+ b3.setStartOrder(4);
+ result.getBundles().add(b3);
+
+ equals(result, assembled);
+ }
+
+ @Test public void testSingleIncludeMultiVersion4() {
+ Feature base = new Feature(ArtifactId.fromMvnId("g:tgtart:1"));
+ Include i1 = new Include(ArtifactId.fromMvnId("g:a:2"));
+ base.setInclude(i1);
+ base.getBundles().add(new Artifact(ArtifactId.fromMvnId("g:myart:1")));
+ base.getBundles().add(new
Artifact(ArtifactId.fromMvnId("group:testmulti:1")));
+ base.getBundles().add(new
Artifact(ArtifactId.fromMvnId("group:testmulti:3")));
+
+ BuilderContext builderContext = new BuilderContext(provider);
+ Feature assembled = FeatureBuilder.assemble(base, builderContext);
+
+ Feature result = new Feature(ArtifactId.parse("g:tgtart:1"));
+ Artifact b0 = new Artifact(ArtifactId.fromMvnId("g:myart:1"));
+ result.getBundles().add(b0);
+ Artifact b1 = new Artifact(ArtifactId.fromMvnId("group:testmulti:1"));
+ result.getBundles().add(b1);
+ Artifact b2 = new Artifact(ArtifactId.fromMvnId("group:testmulti:3"));
+ result.getBundles().add(b2);
+ Artifact b3 = new
Artifact(ArtifactId.fromMvnId("group:someart:1.2.3"));
+ b3.setStartOrder(4);
+ result.getBundles().add(b3);
+
+ equals(result, assembled);
+ }
+
@Test public void testDeduplicationInclude() throws Exception {
final ArtifactId idA = ArtifactId.fromMvnId("g:a:1.0.0");
final ArtifactId idB = ArtifactId.fromMvnId("g:b:1.0.0");
@@ -624,7 +735,7 @@ public Feature provide(ArtifactId id)
{
return null;
}
- }).addVariablesOverwrites(override), aFeature, bFeature);
+ }).addVariablesOverrides(override), aFeature, bFeature);
Map<String,String> vars = new HashMap<>();
vars.putAll(kvMapA);
@@ -645,7 +756,7 @@ public Feature provide(ArtifactId id)
{
return null;
}
- }).addVariablesOverwrites(override), aFeature, bFeature);
+ }).addVariablesOverrides(override), aFeature, bFeature);
fail("Excepted merge exception");
} catch (IllegalStateException expected) {}
@@ -658,7 +769,7 @@ public Feature provide(ArtifactId id)
{
return null;
}
- }).addVariablesOverwrites(override), aFeature, bFeature);
+ }).addVariablesOverrides(override), aFeature, bFeature);
vars = new HashMap<>();
vars.putAll(kvMapA);
@@ -677,7 +788,7 @@ public Feature provide(ArtifactId id)
{
return null;
}
- }).addVariablesOverwrites(override), aFeature, bFeature);
+ }).addVariablesOverrides(override), aFeature, bFeature);
vars.put("var2", null);
assertTrue(cFeature.getVariables().equals(vars));
----------------------------------------------------------------
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us...@infra.apache.org
> Avoid magic when merging features
> ---------------------------------
>
> Key: SLING-8104
> URL: https://issues.apache.org/jira/browse/SLING-8104
> Project: Sling
> Issue Type: Improvement
> Components: Feature Model
> Reporter: Carsten Ziegeler
> Assignee: David Bosschaert
> Priority: Blocker
> Fix For: slingfeature-maven-plugin 1.0.0, Feature Model 0.8.0
>
>
> Currently when features are merged a simple algorithm is applied which just
> picks the highest version based on the artifact version. However this version
> might not have no meaning at all and might not really reflect what has
> changed inside the bundle.
> Especially when there is a major version change, this approach seems to be
> clearly wrong
> But in the end, picking a single version is magic.
> While the problem could probably be solved by using something like a resolver
> and figure out if just one version is enough or if both versions are needed,
> without a resolver there is no way to figure this out.
> Therefore we should provide a similar way as we do for variables at the
> moment: if there is a clash the caller needs to provide context on what to
> choose.
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