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/*
* Copyright 2014-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
package com.amazonaws.services.dynamodbv2.document;
import java.util.List;
import java.util.Map;
import org.apache.http.annotation.ThreadSafe;
import com.amazonaws.annotation.Beta;
import com.amazonaws.services.dynamodbv2.AmazonDynamoDB;
import com.amazonaws.services.dynamodbv2.document.api.QueryApi;
import com.amazonaws.services.dynamodbv2.document.api.ScanApi;
import com.amazonaws.services.dynamodbv2.document.internal.IndexQueryImpl;
import com.amazonaws.services.dynamodbv2.document.internal.IndexScanImpl;
import com.amazonaws.services.dynamodbv2.document.internal.ScanImpl;
import com.amazonaws.services.dynamodbv2.document.spec.QuerySpec;
import com.amazonaws.services.dynamodbv2.document.spec.ScanSpec;
import com.amazonaws.services.dynamodbv2.document.spec.UpdateTableSpec;
import com.amazonaws.services.dynamodbv2.model.DeleteGlobalSecondaryIndexAction;
import com.amazonaws.services.dynamodbv2.model.GlobalSecondaryIndexDescription;
import com.amazonaws.services.dynamodbv2.model.GlobalSecondaryIndexUpdate;
import com.amazonaws.services.dynamodbv2.model.IndexStatus;
import com.amazonaws.services.dynamodbv2.model.ProvisionedThroughput;
import com.amazonaws.services.dynamodbv2.model.ResourceNotFoundException;
import com.amazonaws.services.dynamodbv2.model.TableDescription;
import com.amazonaws.services.dynamodbv2.model.UpdateGlobalSecondaryIndexAction;
import com.amazonaws.services.dynamodbv2.xspec.QueryExpressionSpec;
import com.amazonaws.services.dynamodbv2.xspec.ScanExpressionSpec;
/**
* Represents a secondary index on a DynamoDB table. This covers
* both GSI (Global Secondary Index) and LSI (Local Secondary Index). Instance
* of this class can be obtained via {@link Table#getIndex(String)}.
*/
@ThreadSafe
public class Index implements QueryApi, ScanApi {
private static final long SLEEP_TIME_MILLIS = 5000;
private final Table table;
private final String indexName;
private final QueryApi queryDelegate;
private final ScanImpl scanDelegate;
Index(AmazonDynamoDB client, String indexName, Table table) {
if (client == null)
throw new IllegalArgumentException("client must be specified");
if (indexName == null || indexName.trim().length() == 0)
throw new IllegalArgumentException("index name must not be null or empty");
if (table == null)
throw new IllegalArgumentException("table must be specified");
this.table = table;
this.indexName = indexName;
this.queryDelegate = new IndexQueryImpl(client, this);
this.scanDelegate = new IndexScanImpl(client, this);
}
/**
* Returns the owning table.
*/
public final Table getTable() {
return table;
}
/**
* @return the name of this index
*/
public final String getIndexName() {
return indexName;
}
@Override
public ItemCollection query(KeyAttribute hashKey,
RangeKeyCondition rangeKeyCondition) {
return queryDelegate.query(hashKey, rangeKeyCondition);
}
@Override
public ItemCollection query(KeyAttribute hashKey,
RangeKeyCondition rangeKeyCondition, QueryFilter... queryFilters) {
return queryDelegate.query(hashKey, rangeKeyCondition, queryFilters);
}
@Override
public ItemCollection query(KeyAttribute hashKey,
RangeKeyCondition rangeKeyCondition, String filterExpression,
Map nameMap, Map valueMap) {
return queryDelegate.query(hashKey, rangeKeyCondition,
filterExpression, nameMap, valueMap);
}
@Override
public ItemCollection query(KeyAttribute hashKey,
RangeKeyCondition rangeKeyCondition, String projectionExpression,
String filterExpression, Map nameMap,
Map valueMap) {
return queryDelegate.query(hashKey, rangeKeyCondition,
projectionExpression, filterExpression, nameMap, valueMap);
}
@Beta
public ItemCollection query(KeyAttribute hashKey,
RangeKeyCondition rangeKeyCondition, QueryExpressionSpec queryExpressions) {
return queryDelegate.query(hashKey, rangeKeyCondition,
queryExpressions.getProjectionExpression(),
queryExpressions.getFilterExpression(),
queryExpressions.getNameMap(), queryExpressions.getValueMap());
}
@Override
public ItemCollection query(QuerySpec spec) {
return queryDelegate.query(spec);
}
@Override
public ItemCollection query(
String hashKeyName, Object hashKeyValue) {
return queryDelegate.query(hashKeyName, hashKeyValue);
}
@Override
public ItemCollection query(String hashKeyName,
Object hashKeyValue, RangeKeyCondition rangeKeyCondition) {
return queryDelegate.query(hashKeyName, hashKeyValue, rangeKeyCondition);
}
@Override
public ItemCollection query(String hashKeyName,
Object hashKeyValue, RangeKeyCondition rangeKeyCondition,
QueryFilter... queryFilters) {
return queryDelegate.query(hashKeyName, hashKeyValue,
rangeKeyCondition, queryFilters);
}
@Override
public ItemCollection query(String hashKeyName,
Object hashKeyValue, RangeKeyCondition rangeKeyCondition,
String filterExpression, Map nameMap,
Map valueMap) {
return queryDelegate.query(hashKeyName, hashKeyValue,
rangeKeyCondition, filterExpression, nameMap, valueMap);
}
@Override
public ItemCollection query(String hashKeyName,
Object hashKeyValue, RangeKeyCondition rangeKeyCondition,
String filterExpression, String projectionExpression,
Map nameMap, Map valueMap) {
return queryDelegate.query(hashKeyName, hashKeyValue,
rangeKeyCondition, filterExpression, projectionExpression,
nameMap, valueMap);
}
@Override
public ItemCollection query(KeyAttribute hashKey) {
return queryDelegate.query(hashKey);
}
/**
* Updates the provisioned throughput for this global secondary index (GSI).
* Setting the throughput for an index helps you manage performance and is
* part of the provisioned throughput feature of DynamoDB.
*
* The provisioned throughput values can be upgraded or downgraded based on
* the maximums and minimums listed in the Limits section in the Amazon DynamoDB Developer Guide.
*
* This index must be a global secondary index and in the
* ACTIVE state for this operation to succeed. Updating a GSI
* is an asynchronous operation; while executing the operation, the index is
* in the UPDATING state. While the index is in the
* UPDATING state, the index still has the provisioned
* throughput from before the call. The new provisioned throughput setting
* is in effect only when the index returns to the ACTIVE state
* after the update is complete.
*
* @param provisionedThroughput
* target provisioned throughput
*
* @return the updated table description returned from DynamoDB.
*/
public TableDescription updateGSI(
ProvisionedThroughput provisionedThroughput) {
return table.updateTable(new UpdateTableSpec()
.withGlobalSecondaryIndexUpdates(
new GlobalSecondaryIndexUpdate().withUpdate(
new UpdateGlobalSecondaryIndexAction()
.withIndexName(indexName)
.withProvisionedThroughput(provisionedThroughput))));
}
/**
* Deletes this global secondary index (GSI) from the DynamoDB table.
* Involves network calls.
*
* This index must be a global secondary index and in the
* ACTIVE state for this operation to succeed. Deleting a GSI
* is an asynchronous operation; while executing the operation, the index is
* in the DELETING state.
*
* @return the updated table description returned from DynamoDB.
*/
public TableDescription deleteGSI() {
return table.updateTable(new UpdateTableSpec()
.withGlobalSecondaryIndexUpdates(
new GlobalSecondaryIndexUpdate().withDelete(
new DeleteGlobalSecondaryIndexAction()
.withIndexName(indexName))));
}
/**
* A convenient blocking call that can be used, typically during index
* creation, to wait for the index to become active by polling the table
* every 5 seconds.
*
* Currently online index creation is only supported for Global Secondary
* Index (GSI). Calling this method on a Local Secondary Index (LSI) would
* result in IllegalArgumentException.
*
* @return the table description when the index has become active
*
* @throws IllegalArgumentException if the table is being deleted, or if
* the GSI is not being created or updated, or if the GSI doesn't exist
* @throws ResourceNotFoundException if the table doesn't exist
*/
public TableDescription waitForActive() throws InterruptedException {
final Table table = getTable();
final String tableName = table.getTableName();
final String indexName = getIndexName();
retry: for (;;) {
TableDescription desc = table.waitForActive();
final List list = desc.getGlobalSecondaryIndexes();
if (list != null) {
for (GlobalSecondaryIndexDescription d: list) {
if (d.getIndexName().equals(indexName)) {
final String status = d.getIndexStatus();
switch(IndexStatus.fromValue(status)) {
case ACTIVE:
return desc;
case CREATING:
case UPDATING:
Thread.sleep(SLEEP_TIME_MILLIS);
continue retry;
default:
throw new IllegalArgumentException(
"Global Secondary Index "
+ indexName
+ " is not being created or updated (with status="
+ status + ")");
}
}
}
}
throw new IllegalArgumentException("Global Secondary Index "
+ indexName + " does not exist in Table " + tableName + ")");
}
}
/**
* A convenient blocking call that can be used, typically during index
* deletion on an active table, to wait for the index to become deleted by
* polling the table every 5 seconds.
*
* Currently online index deletion is only supported for Global Secondary
* Index (GSI). The behavior of calling this method on a Local Secondary
* Index (LSI) would result in returning the latest table description.
*
* @return the table description if this GSI has been deleted; or null if
* the underlying table has been deleted.
*
* @throws IllegalArgumentException if the table is being deleted, or if the
* GSI is not being deleted.
* @throws ResourceNotFoundException if the table doesn't exist
*/
public TableDescription waitForDelete() throws InterruptedException {
final String indexName = getIndexName();
retry: for (;;) {
final TableDescription desc = getTable().waitForActive();
List list = desc.getGlobalSecondaryIndexes();
if (list != null) {
for (GlobalSecondaryIndexDescription d: list) {
if (d.getIndexName().equals(indexName)) {
final String status = d.getIndexStatus();
if (IndexStatus.fromValue(status) == IndexStatus.DELETING) {
Thread.sleep(SLEEP_TIME_MILLIS);
continue retry;
}
throw new IllegalArgumentException(
"Global Secondary Index " + indexName
+ " is not being deleted (with status=" + status + ")");
}
}
}
return desc;
}
}
/**
* A convenient blocking call that can be used to wait on an index until it
* has either become active or deleted (ie no longer exists) by polling the
* table every 5 seconds.
*
* Currently online index creation/deletion is only supported for Global
* Secondary Index (GSI). The behavior of calling this method on a Local
* Secondary Index (LSI) would result in returning the latest table
* description.
*
* @return the table description when the index has become either active
* or deleted
*
* @throws IllegalArgumentException if the table is being deleted
* @throws ResourceNotFoundException if the table doesn't exist
*/
public TableDescription waitForActiveOrDelete() throws InterruptedException {
final Table table = getTable();
final String indexName = getIndexName();
retry: for (;;) {
TableDescription desc = table.waitForActive();
List list = desc.getGlobalSecondaryIndexes();
if (list != null) {
for (GlobalSecondaryIndexDescription d: desc.getGlobalSecondaryIndexes()) {
if (d.getIndexName().equals(indexName)) {
final String status = d.getIndexStatus();
if (IndexStatus.fromValue(status) == IndexStatus.ACTIVE)
return desc;
Thread.sleep(SLEEP_TIME_MILLIS);
continue retry;
}
}
}
return desc;
}
}
@Override
public ItemCollection scan(ScanFilter... scanFilters) {
return scanDelegate.scan(scanFilters);
}
@Override
public ItemCollection scan(String filterExpression,
Map nameMap, Map valueMap) {
return scanDelegate.scan(filterExpression, nameMap, valueMap);
}
@Override
public ItemCollection scan(String filterExpression,
String projectionExpression, Map nameMap,
Map valueMap) {
return scanDelegate.scan(filterExpression, projectionExpression, nameMap, valueMap);
}
@Beta
public ItemCollection scan(ScanExpressionSpec xspec) {
return scanDelegate.scan(xspec.getFilterExpression(),
xspec.getProjectionExpression(),
xspec.getNameMap(),
xspec.getValueMap());
}
@Override
public ItemCollection scan(ScanSpec params) {
return scanDelegate.scan(params);
}
}