Understand how callback methods of CacheWriterAdapter work

Question

Spring Boot Version - 1.5.2,

Gemfire version - 8.2.6 (Overriding the managed version 8.2.2),

RegionType - PARTITION_REDUNDANT,

Proxy - ClientRegionShortcut.PROXY,

Database - Cassandra

We are extending CacheWriterAdapter and overriding beforeCreate(), beforeUpdate(), beforeDestroy(). We are connecting to remote gemfire server using JAVA.

@Bean(name = GemfireConstants.DEFAULT_GEMFIRE_CACHE_NAME)
ClientCache gemfireCache(@Qualifier("gemfireProperties") Properties gemfireProperties,
        @Value("${gemfire.locator1:localhost}") String locatorHost,
        @Value("${gemfire.port1:10334}") int locatorPort) {

    ClientCache gemfireCache = new ClientCacheFactory(gemfireProperties).addPoolLocator(locatorHost, locatorPort)
            .setPdxSerializer(pdxSerializer()).setPdxReadSerialized(false).create();

    return gemfireCache;
}

but for HTTP GET, PUT and POST every time beforeCreate() is invoked. However for HTTP DELETE beforeDestroy() is invoked. We also tried printing the boolean values from com/gemstone/gemfire/cache/Operation and detailed analysis is at the bottom. We want to understand

why beforeUpdate is never invoked
why isGet, isContanisKey is false for HTTP GET operation when data is present in gemfire cache
Why isCreate is false for HTTP POST operation
Why isUpdate is false for hTTP PUT operation
Why old value is not fetched for HTTP PUT operation

Scenario -1 Gemfire - No records

Cassandra - Record available

Test Case - HTTP GET service called using existing data which is available in Cassandra not in Gemfire

Result - Cache Loader is invoked first and then CacheWriterAdapter's beforeCreate() invoked with operation as Local_LOAD_CREATE

getNewValue- Object fetched

getOldValue- null

IsLoad-true

IsLocalLoad-true

IsLocal-false

isGetEntry-false

isSearchOrLoad-true

isUpdate-false

isCreate-true

isDestroy-false

isGet-false

isGetEntry-false

isContainsKey-false

isContainsValue-false

isContainsValueForKey-false

Scenario -2

Gemfire - Record Available

Cassandra - Record available

Test Case - HTTP GET service called using existing data which is available in both Cassandra and Gemfire

Result - CacheWriterAdapter's beforeCreate() invoked with operation as Local_LOAD_CREATE

getNewValue- Object fetched

getOldValue- null

IsLoad--true

IsLocalLoad-true

IsLocal-false

isGetEntry-false

isSearchOrLoad-true

isUpdate-false

isCreate-true

isDestroy-false

isGet-false

isGetEntry-false

isContainsKey-false

isContainsValue-false

isContainsValueForKey-false

Scenario -3

Gemfire - No Record Available

Cassandra - No Record available

Test Case - HTTP PostOperation called using new set of data which is not present in Cassandra and Gemfire

Result - CacheWriterAdapter's beforeCreate() invoked with operation as CREATE

getNewValue- Object fetched

getOldValue- null

IsLoad--false

IsLocalLoad-false

IsLocal-false

isGetEntry-false

isNetLoad-false

isSearchOrLoad-false

isUpdate-false

isCreate-true

isDestroy-false

isGet-false

isGetEntry-false

isContainsKey-false

isContainsValue-false

isContainsValueForKey-false

isInvalidate-false

Scenario -4

Gemfire - Record Available

Cassandra - Record available

Application - HTTP PutOperation called using existing data which is available in Cassandra and Gemfire

Result - CacheWriterAdapter's beforeCreate() invoked with operation as CREATE

getNewValue- Object fetched

getOldValue- null

IsLoad--false

IsLocalLoad-false

IsLocal-false

isGetEntry-false

isNetLoad-false

isSearchOrLoad-false

isUpdate-false

isCreate-true

isDestroy-false

isGet-false

isGetEntry-false

isContainsKey-false

isContainsValue-false

isContainsValueForKey-false

isInvalidate-false

Scenario -5

Gemfire - Record Available

Cassandra - Record available

Application - HTTP DeleteOperation called using existing IMEI which is available in Cassandra and Gemfire

Result - CacheWriterAdapter's beforeDestroy() invoked with operation as DESTROY.

getNewValue- Object fetched

getOldValue- null

IsLoad--false

IsLocalLoad-false

IsLocal-false

isGetEntry-false

isNetLoad-false

isSearchOrLoad-false

isUpdate-false

isCreate-false

isDestroy-true

isGet-false

isGetEntry-false

isContainsKey-false

isContainsValue-false

isContainsValueForKey-false

isInvalidate-false

Is this the correct behavior?

Understand how callback methods of CacheWriterAdapter work

0 Answers0