com.datastax.driver.core.querybuilder.Using Java Examples

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Example #1
Source File: ScopedCacheSerializationImpl.java    From usergrid with Apache License 2.0 4 votes vote down vote up 
private V writeValueCQL(CacheScope scope, K key, V value, Integer ttl) {

        Preconditions.checkNotNull( scope, "scope is required");
        Preconditions.checkNotNull( key, "key is required" );
        Preconditions.checkNotNull( value, "value is required");
        Preconditions.checkNotNull( ttl, "ttl is required");


        final String rowKeyString = scope.getApplication().getUuid().toString();
        final int bucket = BUCKET_LOCATOR.getCurrentBucket(rowKeyString);

        // determine column name based on K key to string
        final String columnName = key.toString();

        // serialize cache item
        byte[] cacheBytes;
        try {
            cacheBytes = MAPPER.writeValueAsBytes(value);
        } catch (JsonProcessingException jpe) {
            throw new RuntimeException("Unable to serialize cache value", jpe);
        }

        final Using timeToLive = QueryBuilder.ttl(ttl);


        // convert to ByteBuffer for the blob DataType in Cassandra
        final ByteBuffer bb = ByteBuffer.allocate(cacheBytes.length);
        bb.put(cacheBytes);
        bb.flip();

        final Statement cacheEntry = QueryBuilder.insertInto(SCOPED_CACHE_TABLE)
            .using(timeToLive)
            .value("key", getPartitionKey(scope, rowKeyString, bucket))
            .value("column1", DataType.text().serialize(columnName, ProtocolVersion.NEWEST_SUPPORTED))
            .value("value", bb);


        session.execute(cacheEntry);

        logger.debug("Wrote cache item to scope {}\n   key/value types {}/{}\n   key:value: {}:{}",
            scope.getApplication().getUuid(),
            key.getClass().getSimpleName(),
            value.getClass().getSimpleName(),
            key,
            value);

        return value;

    }