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Custom Object Sync

Module used for importing/syncing CustomObject into a commercetools project. It also provides utilities for correlating a custom object to a given custom object draft based on the comparison of a CustomObject against a CustomObjectDraft.

Usage

Prerequisites

ProjectApiRoot

Use the ClientConfigurationUtils which apply the best practices for ProjectApiRoot creation. To create ClientCredentials which are required for creating a client please use the ClientCredentialsBuilder provided in java-sdk-v2 Client OAUTH2 package If you have custom requirements for the client creation, have a look into the Important Usage Tips.

final ClientCredentials clientCredentials =
        new ClientCredentialsBuilder()
        .withClientId("client-id")
        .withClientSecret("client-secret")
        .withScopes("scopes")
        .build();
final ProjectApiRoot apiRoot = ClientConfigurationUtils.createClient("project-key", clientCredentials, "auth-url", "api-url");

Required Fields

The following fields are required to be set in, otherwise, they won't be matched by sync:

Draft Required Fields Note
CustomObjectDraft key Also, the custom objects in the target project are expected to have the key fields set.
CustomObjectDraft container Also, the custom objects in the target project are expected to have the container fields set.

SyncOptions

After the projectApiRoot is set up, a CustomObjectSyncOptions should be built as follows:

// instantiating a CustomObjectSyncOptions
final CustomObjectSyncOptions customObjectSyncOptions = CustomObjectSyncOptionsBuilder.of(projectApiRoot).build();

SyncOptions is an object which provides a place for users to add certain configurations to customize the sync process. Available configurations:

errorCallback

A callback that is called whenever an error event occurs during the sync process. Each resource executes its own error-callback. When the sync process of a particular resource runs successfully, it is not triggered. It contains the following context about the error-event:

  • sync exception
  • custom object draft from the source
  • custom object of the target project (only provided if an existing custom object could be found)
  • a fake list of update actions, as custom objects API does not provide update actions. NoopResourceUpdateAction.java
 final Logger logger = LoggerFactory.getLogger(CustomObjectSync.class);
 final CustomObjectSyncOptions customObjectSyncOptions = CustomObjectSyncOptionsBuilder
         .of(projectApiRoot)
         .errorCallback((syncException, draft, customObject, updateActions) -> 
            logger.error(new SyncException("My customized message"), syncException)).build();
warningCallback

A callback is called whenever a warning event occurs during the sync process. Each resource executes its own warning-callback. When the sync process of a particular resource runs successfully, it is not triggered. It contains the following context about the warning message:

  • sync exception
  • custom object draft from the source
  • custom object of the target project (only provided if an existing custom object could be found)
 final Logger logger = LoggerFactory.getLogger(CustomObjectSync.class);
 final CustomObjectSyncOptions customObjectSyncOptions = CustomObjectSyncOptionsBuilder
         .of(projectApiRoot)
         .warningCallback((syncException, draft, customObject) -> 
            logger.warn(new SyncException("My customized message"), syncException)).build();
beforeUpdateCallback

In theory, CustomObjectSyncOptions provides callback before update operation. User can customize their own callback and inject into sync options. However, in the actual case, beforeUpdateCallbackis not triggered in the custom object sync process. When the new custom object draft has the same key and container as an existing custom object but different in custom object values, the sync process automatically performs the create/update operation. The value of a corresponding custom object in the target project is overwritten. This approach is different from other resources and no update action is involved.

Also see the API documentation of Create-or-update-customobject

beforeCreateCallback

During the sync process, if a custom object draft should be created, this callback can be used to intercept the create request just before it is sent to the commercetools platform. It contains the following information :

  • custom object draft that should be created

Please refer to example in product sync document.

batchSize

A number that could be used to set the batch size with which custom objects are fetched and processed, as custom objects are obtained from the target project on the commercetools platform in batches for better performance. The algorithm accumulates up to batchSize resources from the input list, then fetches the corresponding custom objects from the target project on the commecetools platform in a single request. Playing with this option can slightly improve or reduce processing speed. If it is not set, the default batch size is 50 for custom object sync.

final CustomObjectSyncOptions customObjectSyncOptions = 
         CustomObjectSyncOptionsBuilder.of(projectApiRoot).batchSize(30).build();
cacheSize

In the service classes of the commercetools-sync-java library, we have implemented an in-memory LRU cache to store a map used for the reference resolution of the library. The cache reduces the reference resolution based calls to the commercetools API as the required fields of a resource will be fetched only one time. These cached fields then might be used by another resource referencing the already resolved resource instead of fetching from commercetools API. It turns out, having the in-memory LRU cache will improve the overall performance of the sync library and commercetools API. which will improve the overall performance of the sync and commercetools API.

Playing with this option can change the memory usage of the library. If it is not set, the default cache size is 10.000 for custom object sync.

final CustomObjectSyncOptions customObjectSyncOptions = 
         CustomObjectSyncOptionsBuilder.of(projectApiRoot).cacheSize(5000).build();

Running the sync

After all the aforementioned points in the previous section have been fulfilled, to run the sync:

// instantiating a CustomObjectSync
final CustomObjectSync customObjectSync = new CustomObjectSync(customObjectSyncOptions);

// execute the sync on your list of custom object drafts
CompletionStage<CustomObjectSyncStatistics> syncStatisticsStage = customObjectSync.sync(customObjectDrafts);

The result of completing the syncStatisticsStage in the previous code snippet contains a CustomObjectSyncStatistics which contains all the stats of the sync process; which includes a report message, the total number of updated, created, failed, processed custom objects and the processing time of the last sync batch in different time units and in a human-readable format.

final CustomObjectSyncStatistics stats = syncStatisticsStage.toCompletebleFuture().join();
stats.getReportMessage();
/*"Summary: 2000 custom objects were processed in total (1000 created, 995 updated, 5 failed to sync)."*/

Note The statistics object contains the processing time of the last batch only. This is due to two reasons:

  1. The sync processing time should not take into account the time between supplying batches to the sync.
  2. It is not known by the sync which batch is going to be the last one supplied.

More examples of how to use the sync

Make sure to read the Important Usage Tips for optimal performance.

Migration Guide

The custom-object-sync uses the JVM-SDK-V2, therefore ensure you Install JVM SDK module commercetools-sdk-java-api with any HTTP client module. The default one is commercetools-http-client.

 // Sample maven pom.xml
 <properties>
     <commercetools.version>LATEST</commercetools.version>
 </properties>

 <dependencies>
     <dependency>
       <groupId>com.commercetools.sdk</groupId>
       <artifactId>commercetools-http-client</artifactId>
       <version>${commercetools.version}</version>
     </dependency>
     <dependency>
       <groupId>com.commercetools.sdk</groupId>
       <artifactId>commercetools-sdk-java-api</artifactId>
       <version>${commercetools.version}</version>
     </dependency>
 </dependencies>

Client configuration and creation

For client creation use ClientConfigurationUtils which apply the best practices for ProjectApiRoot creation. If you have custom requirements for the client creation make sure to replace SphereClientFactory with ApiRootBuilder as described in this Migration Document.

Signature of CustomObjectSyncOptions

As models and update actions have changed in the JVM-SDK-V2 the signature of SyncOptions is different. It's constructor now takes a ProjectApiRoot as first argument. The callback functions are signed with CustomObjectDraft, CustomObject (without type parameter as in v1) from package com.commercetools.api.models.custom_object.* and NoopResourceUpdateAction which is a fake class representing resource without update actions like custom-object.

Note: Make sure beforeUpdateCallback isn't used as the sync will not trigger it in the process. Note: Further make sure on errorCallback to not operate onNoopResourceUpdateAction's actions field as it is null.

Build CustomObjectDraft (syncing from external project)

The custom-object-sync expects a list of CustomObjectDrafts to process. To sync your categories from anywhere (including other CTP project) into a commercetools platform project you have to convert your data into CTP compatible CategoryDraft type. This was done in previous version using DraftBuilders. The V2 SDK do not have inheritance for DraftBuilder classes but the differences are minor and you can replace it easily. Here's an example:

Note: In v1 the value in CustomObjectDraft is of generic type and custom-object-sync was expecting JsonNode as value. This changed in V2 SDK and the sync-library, and value field is of type Object now.

// CategoryDraft builder in v1 takes parameters 'container', 'key' and 'value'
final CustomObjectDraft cutomObjectDraft =
            CustomObjectDraft.ofUnversionedUpsert(
            "someContainer",
            "someKey",
            JsonNodeFactory.instance.objectNode().put("json-field", "json-value"));

// CustomObjectDraftBuilder in v2
final CustomObjectDraft newCustomObjectDraft =
        CustomObjectDraftBuilder.of()
            .container("someContainer")
            .key("someKey")
            .value("someValue")
            .build();

For more information, see the Guide to replace DraftBuilders.

Query for CustomObjects

If you need to query CustomObjects from a commercetools project instead of passing CustomObjectQuery<T>s to a sphereClient, create (and execute) requests directly from the apiRoot. Here's an example:

// SDK v1: CategoryQuery to fetch all categories
final CustomObjectQuery<JsonNode> query = CustomObjectQuery.ofJsonNode();

final PagedQueryResult<CustomObject<JsonNode>> pagedQueryResult = sphereClient.executeBlocking(query);

// SDK v2: Create and execute query to fetch all custom objects in one line
final CustomObjectPagedQueryResponse result = apiRoot.customObjects().get().executeBlocking().getBody();

Read more about querying resources.

JVM-SDK-V2 migration guide

On any other needs to migrate your project using jvm-sdk-v2 please refer to it's Migration Guide.