Issue #10437 - Unify Deployer ContextProvider #12583

joakime · 2024-11-26T21:48:34Z

A single scanner for all Environments.
Environment attributes are how the environment specific deployment configuration is controlled.
Existing properties behaviors maintained.

Currently a WIP (needs more testing and documentation)

…ify-deploy

...-core/jetty-deploy/src/main/java/org/eclipse/jetty/deploy/providers/ScanningAppProvider.java

jetty-core/jetty-deploy/src/main/java/org/eclipse/jetty/deploy/providers/ContextProvider.java

jetty-core/jetty-deploy/src/main/config/etc/jetty-deploy.xml

...loy/src/test/java/org/eclipse/jetty/deploy/providers/ContextProviderDeferredStartupTest.java

...ploy/src/test/java/org/eclipse/jetty/deploy/providers/ContextProviderRuntimeUpdatesTest.java

...etty-deploy/src/test/java/org/eclipse/jetty/deploy/providers/ContextProviderStartupTest.java

jetty-core/jetty-server/src/main/java/org/eclipse/jetty/server/Deployable.java

jetty-ee10/jetty-ee10-webapp/src/main/java/org/eclipse/jetty/ee10/webapp/WebAppContext.java

jetty-core/jetty-deploy/src/main/java/org/eclipse/jetty/deploy/providers/ContextProvider.java

jetty-core/jetty-deploy/src/main/config/etc/jetty-deployment-manager.xml

jetty-core/jetty-deploy/src/main/config/modules/deployment-manager.mod

sbordet · 2024-12-10T12:06:13Z

I'd like to see:

alphabetical sort of scanned files
DeploymentManager does not need to know AppProviders. It's AppProviders that call the DeploymentManager to deploy Apps. AppProviders can just be added as beans to DeploymentManager
Documentation
ContextProvider renamed to something more telling. DeploymentScanningAppProvider? The word "Context" has no meaning in this class, and it is lost in the current class name that it is a ScanningAppProvider.

jetty-core/jetty-deploy/src/main/java/org/eclipse/jetty/deploy/providers/ContextProvider.java

...-core/jetty-deploy/src/main/java/org/eclipse/jetty/deploy/providers/ScanningAppProvider.java

…ify-deploy

…ehaviors. + A DeploymentUnit is all the paths for a specific basename that are being tracked for deployment reasons. + New DeploymentUnitsTest test cases + A new ContextProvider.getMainDeploymentPath for defining the main path deployment heuristics for a unit

…ify-deploy

bogus review

joakime · 2025-01-16T00:15:06Z

Not ready yet, more changes coming (based on conversation from @sbordet )

janbartel · 2025-01-17T00:20:17Z

jetty-core/jetty-deploy/src/main/java/org/eclipse/jetty/deploy/providers/Unit.java

+ * A Unit of deployment, a basename and all the associated
+ * paths that belong to that basename, along with state.
+ */
+public class Unit


I think that Unit should be promoted to a top level class, and App demoted to an implementation detail. The Unit class better captures what we're dealing with - a possible collection of files and/or directories that taken all together represent a deployable. The App is really just a subset of that information.

Unit is a component of a disk based, hot deployment based, disk scanning, local system only approach for deployment. (our ScanningAppProvider abstract and ContextProvider implementation).

Not all users of DeploymentManager or all implementations of AppProvider even use the local disk as a source for their applications. Many come from external sources, some come from build plugins, some come as a result of an action from some other trigger.

Making Unit the top level is the wrong approach.

Can you clarify succinctly the difference between App and Unit using language like "A Unit is a ....", "An App is a ..."? Looking at the code App has Path references and so does Unit, so in that sense they both refer to resources that can be disk based resources, so that can't be the difference.

janbartel · 2025-01-17T00:26:35Z

jetty-core/jetty-deploy/src/main/java/org/eclipse/jetty/deploy/AppProvider.java

     * @return The name of the {@link org.eclipse.jetty.util.component.Environment} this provider is for.
+     * @deprecated not used by all AppProviders, no generic replacement provided.


I think this interface is not named exactly accurately, and the class javadoc is misleading. According to its api, it isn't creating or providing any App instances to the DeploymentManager at all. Looking at it's api, it's function is really to create a ContextHandler instance - after some other class passes in an already created instance of App.

Unit a way that ScanningAppProvider tracks its collection of Path objects to an App via it's basename. (as long as the basename exists, this Unit exist)

App the fundamental unit used to track the App through the deployment lifecycle. (created as part of new deployment, used as reference for moving through lifecycle: undeploy/remove steps)

ContextHandler the feature of the Jetty Server that represents the instantiated and live App

While all of these seem like the same "thing" to track as a single place, it is really 3 levels of abstraction, each with its own life cycle. The Unit has the longest lifecycle, followed by App with a shorter lifecycle, and finally ContextHandler with the shortest (from the point of view of a deployment manager).

A Unit exists for as long as there are Paths with a basename being tracked. (only lives in ScanningAppProvider)
An App only exists if there is an AppProvider that creates it. (note that ScanningAppProvider can have a Unit with no App if there is no main deployment path present for that Unit)
A ContextHandler only exists if there is a need for it in the lifecycle binding. (If a step in the lifecycle needs a ContextHandler then that's when it gets created or accessed. Our standard lifecycle bindings will use the ContextHandler for deploy/start/stop/undeploy, but not the other bindings)

The ContextHandler can even change as the App moves through the registered lifecycle bindings.
For example, a custom binding could wrap the ContextHandler to add an auditing layer.

The lifecycle relationships are such that neither an App nor a ContextHandler (in the sense of deployer) can exist without a Unit. Sure, ContextHandler and App have their own lifecycles, but they ultimately depend on the existence or otherwise of the Unit.

ContextHandlerFactory would be a better name for this interface

Another feature of Unit is that it represents a group of paths that influence the deployment process.

One aspect not made clear is that the environment configuration files (webapps/<env>.xml, webapps/<env>-<name>.xml, webapps/<env>.properties, and webapps/<env>-<name>.properties) are also considered a Unit (with basename <env>) that is tracked by the Scanner. (this is a feature that's been in Jetty 12.0.x since its inception). If one of those files in the unit are changed, then that triggers all associated Apps on that environment to also hot-redeploy.

janbartel · 2025-01-18T00:05:01Z

jetty-core/jetty-deploy/src/main/java/org/eclipse/jetty/deploy/providers/Unit.java

+ * A Unit of deployment, a basename and all the associated
+ * paths that belong to that basename, along with state.
+ */
+public class Unit


Can you clarify succinctly the difference between App and Unit using language like "A Unit is a ....", "An App is a ..."? Looking at the code App has Path references and so does Unit, so in that sense they both refer to resources that can be disk based resources, so that can't be the difference.

janbartel · 2025-01-18T00:06:48Z

jetty-core/jetty-deploy/src/main/java/org/eclipse/jetty/deploy/providers/Unit.java

+        return app;
+    }
+
+    public void setApp(App app)


Creating the App instance external to this class loses the relationship between the set of resources that this Unit is holding, one of which must be used by the App. Having this setter means that the App can have been created using any old path, not necessarily one of the resources associated with this Unit.

That is 100% correct.

A custom AppProvider doesn't have to have the concept of Path (main or otherwise) or anything like that.
This Unit class wouldn't be used in that scenario.

janbartel · 2025-01-18T00:09:17Z

...-core/jetty-deploy/src/main/java/org/eclipse/jetty/deploy/providers/ScanningAppProvider.java

-     * {@link org.eclipse.jetty.util.resource.ResourceFactory#newResource(String)}
-     * @return The App object for this particular context definition file.
+     * @param path The file that the main point of deployment (eg: a context XML, a WAR file, a directory, etc)
+     * @return The App object for this particular context.
     */
    protected App createApp(Path path)


If the Unit produced the App then that would better control that the path must be one of those known about by the Unit. In fact, you should probably be able to navigate from an App to the parent Unit also.

Not all Unit instances have App. (re: Environment Config files are grouped into a Unit by its environment name, and trigger synthetic Changes to all registered App that are managed by ContextProvider and being tracked by our Unit).

App instances from other (custom) AppProviders do not have a Unit and are not seen by our ContextProvider.

Only our ContextProvider needs to know the App for the Unit.
Keep in mind that Unit is just ours, not a general purpose API, like App is.

janbartel · 2025-01-18T00:15:42Z

jetty-core/jetty-deploy/src/main/java/org/eclipse/jetty/deploy/AppProvider.java

     * @return The name of the {@link org.eclipse.jetty.util.component.Environment} this provider is for.
+     * @deprecated not used by all AppProviders, no generic replacement provided.


The lifecycle relationships are such that neither an App nor a ContextHandler (in the sense of deployer) can exist without a Unit. Sure, ContextHandler and App have their own lifecycles, but they ultimately depend on the existence or otherwise of the Unit.

gregw · 2025-01-18T01:28:43Z

jetty-core/jetty-deploy/src/main/java/org/eclipse/jetty/deploy/providers/ContextProvider.java

+    {
+        // XML always win.
+        List<Path> xmls = unit.getPaths().keySet().stream()
+            .filter(FileID::isXml)


Need to filter out removed paths as well

This uses the new Unit.getLivePaths(), which filters out REMOVED state paths.

jetty-core/jetty-deploy/src/main/java/org/eclipse/jetty/deploy/providers/ContextProvider.java

gregw · 2025-01-18T01:30:21Z

jetty-core/jetty-deploy/src/main/java/org/eclipse/jetty/deploy/AppProvider.java

     * @return The name of the {@link org.eclipse.jetty.util.component.Environment} this provider is for.
+     * @deprecated not used by all AppProviders, no generic replacement provided.


ContextHandlerFactory would be a better name for this interface

gregw · 2025-01-18T01:37:20Z

jetty-core/jetty-deploy/src/main/java/org/eclipse/jetty/deploy/providers/ContextProvider.java

+     * @return the main deployable path
+     */
+    @Override
+    protected Path getMainDeploymentPath(Unit unit)


It is a bit strange that the logic that knows how to group different paths into a single unit is in the internal DeploymentUnits, whilst the logic to pick which of them is the main deployment path is here, in an entirely different place. Surely both bits of logic are related and should be in the same class

Picking the main path seems more like a ContextProvider concern.
The Unit and DeploymentUnits is go-between from the Scanner events to the ContextProvider.

gregw · 2025-01-18T01:39:07Z

jetty-core/jetty-deploy/src/main/java/org/eclipse/jetty/deploy/providers/ContextProvider.java

+        if (dirs.size() > 1)
+            throw new IllegalStateException("More than 1 Directory for deployable " + asStringList(dirs));
+
+        throw new IllegalStateException("Unable to determine main deployable for " + unit);


Is this really an ISE? If we have just created foo.d or foo.properties, then we don't have enough to deploy anything, but I don't think it is an exceptional condition. Perhaps a null return would be better, reflecting a unit that does not have a deployable path.

Good point.
We need a testcase for this scenario.

What would you expect the result to be?
Kind feels like a "core" deployment, not a servlet deployment.

gregw · 2025-01-18T01:50:19Z

jetty-core/jetty-deploy/src/main/java/org/eclipse/jetty/deploy/providers/Unit.java

+
+        // Calculate state of unit from Path states.
+        Unit.State ret = null;
+        for (Unit.State pathState : paths.values())


The algorithm here needs to be well documented in a comment so we can check if it is correct. A unit is:

REMOVED if it is empty or all its deployable paths (xml, war, directory) are REMOVED

CHANGED if it has at least one path that is not UNCHANGED. If that one path is ADDED, then it must have another path that is not ADDED

ADDED if it has one or more deployable paths that are ADDED and none that are not ADDED

Note the inclusion of the concept of a deployable path (xml, war, directory), as only changes to them may result in ADDED or REMOVED. However a change to a non deployable path (properties or .d) can result in a CHANGED.

I don't think the implementation is right (also I think my description above might need improvement as well).

I added some new javadoc, and some tests of Unit.calcState(), and fixed the implementation some to address these concerns better.

https://github.com/jetty/jetty.project/blob/fix/12.1.x/unify-deploy/jetty-core/jetty-deploy/src/test/java/org/eclipse/jetty/deploy/providers/UnitTest.java

joakime added 8 commits November 22, 2024 15:01

Initial pass at implementation of EnvironmentContextProvider

8878567

Fixing javadoc errors

3a46e37

Moving things around

c5c07c2

Moving changes back into ContextProvider

e0bdeb3

Introducing ContextProvider.configureEnvironment(String name)

7588d5f

Fixing <env>[-zzz].properties sorting

42015b3

Allow an Environment to be removed (needed for testing with Environment)

f9c90ce

Fixing test cases

83fc5f1

joakime added Enhancement Bug For general bugs on Jetty side labels Nov 26, 2024

joakime requested a review from sbordet November 26, 2024 21:48

joakime self-assigned this Nov 26, 2024

joakime changed the base branch from jetty-12.0.x to jetty-12.1.x November 26, 2024 21:48

joakime linked an issue Nov 26, 2024 that may be closed by this pull request

Review DeploymentManager and ScanningAppProvider #10437

Open

joakime added 10 commits November 27, 2024 07:45

Merge remote-tracking branch 'origin/jetty-12.1.x' into fix/12.1.x/un…

a0c9058

…ify-deploy

Fix javadoc

249679f

Fix method names

bef04d9

Fixing Environment contextClass loading

add337a

Fixing test cases

2e9660d

Fixing quickstart XML references to provider

9bfab80

Merge remote-tracking branch 'origin/jetty-12.1.x' into fix/12.1.x/un…

2c651ea

…ify-deploy

Fixing quickstart XML

0e534f7

Fixing deploy containerScanJarPattern for ee9/ee8

43eb679

Merge remote-tracking branch 'origin/jetty-12.1.x' into fix/12.1.x/un…

c5a00b8

…ify-deploy

joakime marked this pull request as ready for review December 3, 2024 00:01

janbartel requested a review from gregw December 10, 2024 04:35

janbartel requested changes Dec 10, 2024

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sbordet requested changes Dec 10, 2024

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jetty-core/jetty-deploy/src/main/java/org/eclipse/jetty/deploy/providers/ContextProvider.java Show resolved Hide resolved

joakime added 2 commits December 20, 2024 15:10

Reworking deploy.createContextHandler to be easier to follow

ee18845

Fixing WebAppContext default-context-path mistake

e498f2c

gregw requested changes Dec 21, 2024

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joakime added 2 commits January 2, 2025 12:46

Merge remote-tracking branch 'origin/jetty-12.1.x' into fix/12.1.x/un…

2b0741b

…ify-deploy

Merge remote-tracking branch 'origin/jetty-12.1.x' into fix/12.1.x/un…

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joakime mentioned this pull request Jan 15, 2025

No hot deployment when replacing war-file #12543

Open

Merge remote-tracking branch 'origin/jetty-12.1.x' into fix/12.1.x/un…

4fd255b

…ify-deploy

joakime requested review from janbartel, firoj0, gregw and sbordet and removed request for firoj0 January 15, 2025 21:45

joakime marked this pull request as draft January 16, 2025 00:14

joakime added 4 commits January 16, 2025 14:02

Fix deprecation warnings

1ebdd10

Introduce ChangeSetListener in Scanner

d5def4c

Changes from review

54960bd

Changes from review

c16fdf7

janbartel requested changes Jan 17, 2025

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joakime added 2 commits January 17, 2025 14:53

Adding environment configuration hotreload ability

bc1b50f

Correct syntax

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janbartel reviewed Jan 18, 2025

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joakime added 2 commits January 20, 2025 15:59

Updating Unit.calcState javadoc and unit tests.

4d286d7

Use new Unit.getLivePaths() impl

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Issue #10437 - Unify Deployer ContextProvider #12583

Issue #10437 - Unify Deployer ContextProvider #12583

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		* @return The name of the {@link org.eclipse.jetty.util.component.Environment} this provider is for.
		* @deprecated not used by all AppProviders, no generic replacement provided.

Issue #10437 - Unify Deployer ContextProvider #12583

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Issue #10437 - Unify Deployer ContextProvider #12583

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sbordet commented Dec 10, 2024 •

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