Example usage for com.amazonaws.services.dynamodbv2.document Expected Expected

Introduction

In this page you can find the example usage for com.amazonaws.services.dynamodbv2.document Expected Expected.

Prototype

public Expected(String attrName) 

Source Link

Usage

From source file:com.clicktravel.infrastructure.persistence.aws.dynamodb.DynamoDocumentStoreTemplate.java

License:Apache License

@Override
public <T extends Item> T update(final T item,
        final PersistenceExceptionHandler<?>... persistenceExceptionHandlers) {
    final ItemConfiguration itemConfiguration = getItemConfiguration(item.getClass());
    if (item.getVersion() == null) {
        return create(item);
    }/* w  w  w .  java 2 s.  c  o m*/

    final Expected expectedCondition = new Expected(VERSION_ATTRIBUTE).eq(item.getVersion());
    final Long newVersion = item.getVersion() + 1l;
    item.setVersion(newVersion);

    final String tableName = databaseSchemaHolder.schemaName() + "." + itemConfiguration.tableName();
    final String itemJson = itemToString(item);
    final PrimaryKey primaryKey = new PrimaryKey();
    final ItemId itemId = itemConfiguration.getItemId(item);
    final PrimaryKeyDefinition primaryKeyDefinition = itemConfiguration.primaryKeyDefinition();
    primaryKey.addComponent(primaryKeyDefinition.propertyName(), itemId.value());
    if (primaryKeyDefinition instanceof CompoundPrimaryKeyDefinition) {
        primaryKey.addComponent(((CompoundPrimaryKeyDefinition) primaryKeyDefinition).supportingPropertyName(),
                itemId.supportingValue());
    }
    final Table table = dynamoDBClient.getTable(tableName);
    final com.amazonaws.services.dynamodbv2.document.Item previousAwsItem = table.getItem(primaryKey);
    final String previousItemJson = previousAwsItem.toJSON();

    final String mergedJson = mergeJSONObjects(itemJson, previousItemJson);
    final com.amazonaws.services.dynamodbv2.document.Item awsItem = com.amazonaws.services.dynamodbv2.document.Item
            .fromJSON(mergedJson);
    final PutItemSpec putItemSpec = new PutItemSpec().withItem(awsItem).withExpected(expectedCondition);
    try {
        table.putItem(putItemSpec);
    } catch (final ConditionalCheckFailedException e) {
        throw new OptimisticLockException("Conflicting write detected while updating item");
    }
    return item;
}

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From source file:org.springframework.integration.aws.metadata.DynamoDbMetaDataStore.java

License:Apache License

@Override
public String putIfAbsent(String key, String value) {
    Assert.hasText(key, "'key' must not be empty.");
    Assert.hasText(value, "'value' must not be empty.");

    awaitForActive();//from  w w  w  . j  ava  2 s .  c  o m

    try {
        this.table.updateItem(new UpdateItemSpec().withPrimaryKey(KEY, key)
                .withAttributeUpdate(new AttributeUpdate(VALUE).put(value))
                .withExpected(new Expected(KEY).notExist()));

        return null;
    } catch (ConditionalCheckFailedException e) {
        return get(key);
    }
}

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From source file:org.springframework.integration.aws.metadata.DynamoDbMetaDataStore.java

License:Apache License

@Override
public boolean replace(String key, String oldValue, String newValue) {
    Assert.hasText(key, "'key' must not be empty.");
    Assert.hasText(oldValue, "'value' must not be empty.");
    Assert.hasText(newValue, "'newValue' must not be empty.");

    awaitForActive();//  ww w .j  a  v  a  2s.c o  m

    try {
        return this.table.updateItem(new UpdateItemSpec().withPrimaryKey(KEY, key)
                .withAttributeUpdate(new AttributeUpdate(VALUE).put(newValue))
                .withExpected(new Expected(VALUE).eq(oldValue)).withReturnValues(ReturnValue.UPDATED_NEW))
                .getItem() != null;
    } catch (ConditionalCheckFailedException e) {
        return false;
    }
}

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From source file:tr.com.serkanozal.samba.cache.impl.SambaGlobalCache.java

License:Open Source License

@Override
public boolean replace(String key, Object oldValue, Object newValue) {
    boolean replaced = false;
    if (oldValue == null && newValue != null) {
        byte[] newData = serialize(newValue);
        Item item = new Item().withPrimaryKey("id", key).withBinary("data", newData).with("source", UUID);
        try {//from  ww w. j a v a 2s  .  co  m
            DYNAMO_DB_TABLE.putItem(item, new Expected("id").notExist());
            replaced = true;
        } catch (ConditionalCheckFailedException e) {
        }
    } else if (oldValue != null && newValue == null) {
        byte[] oldData = serialize(oldValue);
        try {
            DYNAMO_DB_TABLE.deleteItem("id", key, new Expected("data").eq(oldData));
            replaced = true;
        } catch (ConditionalCheckFailedException e) {
        }
    } else if (oldValue != null && newValue != null) {
        byte[] oldData = serialize(oldValue);
        byte[] newData = serialize(newValue);
        Item item = new Item().withPrimaryKey("id", key).withBinary("data", newData).with("source", UUID);
        try {
            DYNAMO_DB_TABLE.putItem(item, new Expected("data").eq(oldData));
            replaced = true;
        } catch (ConditionalCheckFailedException e) {
        }
    }
    if (replaced && LOGGER.isDebugEnabled()) {
        LOGGER.debug(String.format("Old value %s has been replaced with new value %s " + "assigned to key %s",
                oldValue, newValue, key));
    }
    return replaced;
}

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