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/*
* Copyright (c) 2010-2015 Pivotal Software, Inc. 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. You
* may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License 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. See accompanying
* LICENSE file.
*/
package com.gemstone.gemfire.cache.query;
import java.util.*;
import com.gemstone.gemfire.cache.*;
import com.gemstone.gemfire.cache.query.internal.Undefined;
/**
* Interface for the query service, which is used for instantiating queries,
* creating and destroying indexes, creating CQs and operating on CQs.
*
* Creating an index on an employee's age using QueryService in region "employeeRegion",
* QueryService queryService = cache.getQueryService();
* queryService.createIndex ("SampleIndex", //IndexName
* "e.age" //indexExpression
* "/employeeRegion e", //regionPath
* );
*
* The CQs work on the server regions, the client can use the CQ methods supported
* in this class to create/operate CQs on the server. The CQ obtains the Server
* connection from the corresponding local region on the client.
* The implementation of this interface is obtained from the Cache
* using {@link Cache#getQueryService}.
*
*
* @author Eric Zoerner
* @since 4.0
*/
public interface QueryService {
/** The undefined constant */
public static final Object UNDEFINED = new Undefined();
/**
* Constructs a new Query object.
*
* @param queryString the String that is the query program
* @return The new Query object.
* @throws QueryInvalidException if the syntax of the queryString is invalid.
* @see Query
*/
public Query newQuery(String queryString);
/**
* Create a hash index that can be used when executing equal and not equal
* queries. Hash index is not supported with asynchronous index maintenance.
* Hash index is also not supported with a from clause with multiple iterators.
* Queries on numeric types must match the indexed value. For Example:
* For a float field the query should be specified as floatField = 1.0f
*
* @param indexName the name of this index.
* @param indexedExpression refers to the field of the region values that
* are referenced by the regionPath.
* @param regionPath that resolves to region values or nested
* collections of region values which will correspond to the
* FROM clause in a query. Check following examples.
* The regionPath is restricted to only one expression
*
* Example:
* Query1: "Select * from /portfolio p where p.mktValue = 25.00"
* For index on mktValue field:
* indexExpression: "p.mktValue"
* regionPath: "/portfolio p"
*
* @return the newly created Index
* @throws QueryInvalidException if the argument query language strings have
* invalid syntax
* @throws IndexInvalidException if the arguments do not correctly specify an
* index
* @throws IndexNameConflictException if an index with this name already
* exists
* @throws IndexExistsException if an index with these parameters already
* exists with a different name
* @throws RegionNotFoundException if the region referred to in the fromClause
* doesn't exist
* @throws UnsupportedOperationException If Index is being created on a region
* which does not support indexes.
*
*/
public Index createHashIndex(String indexName, String indexedExpression,
String regionPath) throws IndexInvalidException,
IndexNameConflictException, IndexExistsException,
RegionNotFoundException, UnsupportedOperationException;
/**
* Create a hash index that can be used when executing equal and not equal
* queries. Hash index is not supported with asynchronous index maintenance.
* Hash index is also not supported with a from clause with multiple iterators.
* Queries on numeric types must match the indexed value. For Example:
* For a float field the query should be specified as floatField = 1.0f
*
* @param indexName the name of this index.
* @param indexedExpression refers to the field of the region values that
* are referenced by the regionPath.
* @param regionPath that resolves to region values or nested
* collections of region values which will correspond to the
* FROM clause in a query.
* The regionPath must include exactly one region
* The regionPath is restricted to only one expression
* @param imports string containing imports (in the query language syntax,
* each import statement separated by a semicolon), provides packages
* and classes used in variable typing in the Indexed and FROM
* expressions. The use is the same as for the FROM clause in
* querying.
*
* Example:
* Query1: "Select * from /portfolio p where p.mktValue = 25.00"
* For index on mktValue field:
* indexExpression: "p.mktValue"
* regionPath: "/portfolio p"
*
* @return the newly created Index
* @throws QueryInvalidException if the argument query language strings have
* invalid syntax
* @throws IndexInvalidException if the arguments do not correctly specify an
* index
* @throws IndexNameConflictException if an index with this name already
* exists
* @throws IndexExistsException if an index with these parameters already
* exists with a different name
* @throws RegionNotFoundException if the region referred to in the fromClause
* doesn't exist
* @throws UnsupportedOperationException If Index is being created on a region
* which overflows to disk
*/
public Index createHashIndex(String indexName, String indexedExpression,
String regionPath, String imports) throws IndexInvalidException,
IndexNameConflictException, IndexExistsException,
RegionNotFoundException, UnsupportedOperationException;
/**
*
* @deprecated As of 6.6.2, use
* {@link #createIndex(String, String, String)} and
* {@link #createKeyIndex(String, String, String)} instead.
*
* Create an index that can be used when executing queries.
*
* @param indexName the name of this index, used for statistics collection and
* to identify this index for later access
* @param indexType the type of index. The indexType must be either
* IndexType.FUNCTIONAL or IndexType.PRIMARY_KEY.
* @param indexedExpression refers to the elements of the collection (or
* collection of structs) that are referenced in the fromClause.
* This expression is used to optimize the comparison of the same
* path found in a query's WHERE clause when used to compare against
* a constant expression.
* For example, an index with indexedExpression "mktValue" might
* be used for a query with a WHERE clause of "mktValue > 25.00".
* The exact use and specification of the indexedExpression varies
* depending on the indexType.
* Query parameters and region paths are not allowed in the
* indexedExpression (e.g. $1).
* @param fromClause expression, that resolves to a collection or list of
* collections which will correspond to the FROM clause or part of a
* FROM clause in a SELECT statement. The FROM clause must include
* exactly one region, but may include multiple FROM expressions as
* required to drill down into nested region contents.
* The collections that the FROM expressions evaluate to must be
* dependent on one and only one entry in the referenced region
* (otherwise the index could not be maintained on single entry
* updates). References to query parameters are not allowed.
* For primary key indexes, the fromClause must be just one collection
* which must be a region path only.
* @return the newly created Index
* @throws QueryInvalidException if the argument query language strings have
* invalid syntax
* @throws IndexInvalidException if the arguments do not correctly specify an
* index
* @throws IndexNameConflictException if an index with this name already
* exists
* @throws IndexExistsException if an index with these parameters already
* exists with a different name
* @throws RegionNotFoundException if the region referred to in the fromClause
* doesn't exist
* @throws UnsupportedOperationException If Index is being created on a region which
* overflows to disk
*
*/
@Deprecated
public Index createIndex(String indexName, IndexType indexType,
String indexedExpression, String fromClause)
throws IndexInvalidException, IndexNameConflictException,
IndexExistsException, RegionNotFoundException, UnsupportedOperationException;
/**
* @deprecated As of 6.6.2, use
* {@link #createIndex(String, String, String, String)} and
* {@link #createKeyIndex(String, String, String)} instead.
*
* Create an index that can be used when executing queries.
*
* @param indexName the name of this index, used for statistics collection and
* to identify this index for later access
* @param indexType the type of index. The indexType must be either
* IndexType.FUNCTIONAL or IndexType.PRIMARY_KEY.
* @param indexedExpression refers to the elements of the collection (or
* collection of structs) that are referenced in the fromClause.
* This expression is used to optimize the comparison of the same
* path found in a query's WHERE clause when used to compare against
* a constant expression.
* For example, an index with indexedExpression "mktValue" might
* be used for a query with a WHERE clause of "mktValue > 25.00".
* The exact use and specification of the indexedExpression varies
* depending on the indexType.
* Query parameters and region paths are not allowed in the
* indexedExpression (e.g. $1).
* @param fromClause expression, that resolves to a collection or list of
* collections which will correspond to the FROM clause or part of a
* FROM clause in a SELECT statement. The FROM clause must include
* exactly one region, but may include multiple FROM expressions as
* required to drill down into nested region contents.
* The collections that the FROM expressions evaluate to must be
* dependent on one and only one entry in the referenced region
* (otherwise the index could not be maintained on single entry
* updates). References to query parameters are not allowed.
* For primary key indexes, the fromClause must be just one collection
* which must be a region path only.
* @param imports string containing imports (in the query language syntax,
* each import statement separated by a semicolon), provides packages
* and classes used in variable typing in the Indexed and FROM
* expressions.
* The use is the same as for the FROM clause in querying.
* @return the newly created Index
* @throws QueryInvalidException if the argument query language strings have
* invalid syntax
* @throws IndexInvalidException if the arguments do not correctly specify an
* index
* @throws IndexNameConflictException if an index with this name already
* exists
* @throws IndexExistsException if an index with these parameters already
* exists with a different name
* @throws RegionNotFoundException if the region referred to in the fromClause
* doesn't exist
* @throws UnsupportedOperationException If Index is being created on a region which
* overflows to disk
*/
@Deprecated
public Index createIndex(String indexName, IndexType indexType,
String indexedExpression, String fromClause, String imports)
throws IndexInvalidException, IndexNameConflictException,
IndexExistsException, RegionNotFoundException, UnsupportedOperationException;
/**
* Create an index that can be used when executing queries.
*
* @param indexName the name of this index.
* @param indexedExpression refers to the field of the region values that
* are referenced by the regionPath.
* @param regionPath that resolves to region values or nested
* collections of region values which will correspond to the
* FROM clause in a query. Check following examples.
* The regionPath must include exactly one region, but may include
* multiple expressions as required to drill down into nested
* region contents.
*
* Example:
* Query1: "Select * from /portfolio p where p.mktValue > 25.00"
* For index on mktValue field:
* indexExpression: "p.mktValue"
* regionPath: "/portfolio p"
*
* Query2: "Select * from /portfolio p, p.positions.values pos where pos.secId ='VMWARE'"
* For index on secId field:
* indexExpression: "pos.secId"
* regionPath: "/portfolio p, p.positions.values pos"
* @return the newly created Index
* @throws QueryInvalidException if the argument query language strings have
* invalid syntax
* @throws IndexInvalidException if the arguments do not correctly specify an
* index
* @throws IndexNameConflictException if an index with this name already
* exists
* @throws IndexExistsException if an index with these parameters already
* exists with a different name
* @throws RegionNotFoundException if the region referred to in the fromClause
* doesn't exist
* @throws UnsupportedOperationException If Index is being created on a region
* which does not support indexes.
*
*/
public Index createIndex(String indexName, String indexedExpression,
String regionPath) throws IndexInvalidException,
IndexNameConflictException, IndexExistsException,
RegionNotFoundException, UnsupportedOperationException;
/**
* Create an index that can be used when executing queries.
*
* @param indexName the name of this index.
* @param indexedExpression refers to the field of the region values that
* are referenced by the regionPath.
* @param regionPath that resolves to region values or nested
* collections of region values which will correspond to the
* FROM clause in a query.
* The regionPath must include exactly one region, but may include
* multiple expressions as required to drill down into nested
* region contents. Check following examples.
* @param imports string containing imports (in the query language syntax,
* each import statement separated by a semicolon), provides packages
* and classes used in variable typing in the Indexed and FROM
* expressions. The use is the same as for the FROM clause in
* querying.
*
* Example:
* Query1: "Select * from /portfolio p where p.mktValue > 25.00"
* For index on mktValue field:
* indexExpression: "p.mktValue"
* regionPath: "/portfolio p"
*
* Query2: "Select * from /portfolio p, p.positions.values pos where pos.secId ='VMWARE'"
* For index on secId field:
* indexExpression: "pos.secId"
* regionPath: "/portfolio p, p.positions.values pos TYPE Position"
* imports: "package.Position"
* @return the newly created Index
* @throws QueryInvalidException if the argument query language strings have
* invalid syntax
* @throws IndexInvalidException if the arguments do not correctly specify an
* index
* @throws IndexNameConflictException if an index with this name already
* exists
* @throws IndexExistsException if an index with these parameters already
* exists with a different name
* @throws RegionNotFoundException if the region referred to in the fromClause
* doesn't exist
* @throws UnsupportedOperationException If Index is being created on a region
* which overflows to disk
*/
public Index createIndex(String indexName, String indexedExpression,
String regionPath, String imports) throws IndexInvalidException,
IndexNameConflictException, IndexExistsException,
RegionNotFoundException, UnsupportedOperationException;
/**
* Create a key index that can be used when executing queries. The key index
* expression indicates query engine to use region key as index for query
* evaluation. They are used to make use of the implicit hash index
* supported with GemFire regions.
*
* @param indexName the name of this index.
* @param indexedExpression refers to the keys of the region that
* is referenced by the regionPath.
* For example, an index with indexedExpression "ID" might
* be used for a query with a WHERE clause of "ID > 10", In this case
* the ID value is evaluated using region keys.
* @param regionPath that resolves to the region which will
* correspond to the FROM clause in a query.
* The regionPath must include exactly one region.
*
* Example:
* Query1: "Select * from /portfolio p where p.ID = 10"
* indexExpression: "p.ID"
* regionPath: "/portfolio p"
*
* @return the newly created Index
* @throws QueryInvalidException if the argument query language strings have
* invalid syntax
* @throws IndexInvalidException if the arguments do not correctly specify an
* index
* @throws IndexNameConflictException if an index with this name already
* exists
* @throws IndexExistsException if an index with these parameters already
* exists with a different name
* @throws RegionNotFoundException if the region referred to in the fromClause
* doesn't exist
* @throws UnsupportedOperationException If Index is being created on a region
* which overflows to disk
*/
public Index createKeyIndex(String indexName, String indexedExpression,
String regionPath) throws IndexInvalidException,
IndexNameConflictException, IndexExistsException,
RegionNotFoundException, UnsupportedOperationException;
/**
* Get the Index from the specified Region with the specified name.
*
* @param region the Region for the requested index
* @return the index of the region with this name, or null if there isn't one
*/
public Index getIndex(Region region, String indexName);
/**
* Get a collection of all the indexes in the Cache.
*
* @return the collection of all indexes in this Cache
*/
public Collection getIndexes();
/**
* Get a collection of all the indexes on the specified Region
*
* @param region the region for the requested indexes
* @return the collection of indexes on the specified region
*/
public Collection getIndexes(Region region);
/**
*
* @deprecated As of 6.6.2, use {@link #getIndexes(Region)} only.
*
* Get a collection of all the indexes on the specified Region of
* the specified index type.
*
* @param region the region for the requested indexes
* @param indexType the type of indexes to get. Currently must be
* Indexable.FUNCTIONAL
* @return the collection of indexes for the specified region and type
*/
@Deprecated
public Collection getIndexes(Region region, IndexType indexType);
/**
* Remove the specified index.
*
* @param index the Index to remove
*/
public void removeIndex(Index index);
/**
* Remove all the indexes from this cache.
*/
public void removeIndexes();
/**
* Remove all the indexes on the specified Region
*
* @param region the Region to remove all indexes from
*/
public void removeIndexes(Region region);
// CQ Service related APIs.
/**
* Constructs a new continuous query, represented by an instance of
* CqQuery. The CqQuery is not executed until the execute method
* is invoked on the CqQuery.
* @since 5.5
* @param queryString the OQL query
* @param cqAttr the CqAttributes
* @return the newly created CqQuery object
* @throws IllegalArgumentException if queryString or cqAttr is null.
* @throws IllegalStateException if this method is called from a cache
* server.
* @throws QueryInvalidException if there is a syntax error in the query.
* @throws CqException if failed to create CQ.
* E.g.: Query string should refer to only one region.
* Joins are not supported.
* The query must be a SELECT statement.
* DISTINCT queries are not supported.
* Projections are not supported.
* Only one iterator in the FROM clause is supported, and it must be a region path.
* Bind parameters in the query are not yet supported.
*/
public CqQuery newCq(String queryString, CqAttributes cqAttr)
throws QueryInvalidException, CqException;
/**
* Constructs a new continuous query, represented by an instance of
* CqQuery. The CqQuery is not executed until the execute method
* is invoked on the CqQuery.
*
* @since 5.5
* @param queryString the OQL query
* @param cqAttr the CqAttributes
* @param isDurable true if the CQ is durable
* @return the newly created CqQuery object
* @throws IllegalArgumentException if queryString or cqAttr is null.
* @throws IllegalStateException if this method is called from a cache
* server.
* @throws QueryInvalidException if there is a syntax error in the query.
* @throws CqException if failed to create CQ.
* E.g.: Query string should refer to only one region.
* Joins are not supported.
* The query must be a SELECT statement.
* DISTINCT queries are not supported.
* Projections are not supported.
* Only one iterator in the FROM clause is supported, and it must be a region path.
* Bind parameters in the query are not yet supported.
*/
public CqQuery newCq(String queryString, CqAttributes cqAttr, boolean isDurable)
throws QueryInvalidException, CqException;
/**
* Constructs a new named continuous query, represented by an instance of
* CqQuery. The CqQuery is not executed until the execute method
* is invoked on the CqQuery. The name of the query will be used
* to identify this query in statistics archival.
*
* @since 5.5
* @param name the String name for this query
* @param queryString the OQL query
* @param cqAttr the CqAttributes
* @return the newly created CqQuery object
* @throws CqExistsException if a CQ by this name already exists on this
* client
* @throws IllegalArgumentException if queryString or cqAttr is null.
* @throws IllegalStateException if this method is called from a cache
* server.
* @throws QueryInvalidException if there is a syntax error in the query.
* @throws CqException if failed to create cq.
* E.g.: Query string should refer to only one region.
* Joins are not supported.
* The query must be a SELECT statement.
* DISTINCT queries are not supported.
* Projections are not supported.
* Only one iterator in the FROM clause is supported, and it must be a region path.
* Bind parameters in the query are not yet supported.
*
*/
public CqQuery newCq(String name, String queryString, CqAttributes cqAttr)
throws QueryInvalidException, CqExistsException, CqException;
/**
* Constructs a new named continuous query, represented by an instance of
* CqQuery. The CqQuery is not executed until the execute method
* is invoked on the CqQuery. The name of the query will be used
* to identify this query in statistics archival.
*
* @since 5.5
* @param name the String name for this query
* @param queryString the OQL query
* @param cqAttr the CqAttributes
* @param isDurable true if the CQ is durable
* @return the newly created CqQuery object
* @throws CqExistsException if a CQ by this name already exists on this
* client
* @throws IllegalArgumentException if queryString or cqAttr is null.
* @throws IllegalStateException if this method is called from a cache
* server.
* @throws QueryInvalidException if there is a syntax error in the query.
* @throws CqException if failed to create cq.
* E.g.: Query string should refer to only one region.
* Joins are not supported.
* The query must be a SELECT statement.
* DISTINCT queries are not supported.
* Projections are not supported.
* Only one iterator in the FROM clause is supported, and it must be a region path.
* Bind parameters in the query are not yet supported.
*
*/
public CqQuery newCq(String name, String queryString, CqAttributes cqAttr, boolean isDurable)
throws QueryInvalidException, CqExistsException, CqException;
/**
* Unregister all Continuous Queries.
* All artifacts and resources associated with the CQs are released.
* Any attempt to access closed CqQuery objects will result in the
* CqClosedException being thrown to the caller.
*
* @since 5.5
*/
public void closeCqs();
/**
* Retrieve all registered Continuous Queries.
* This is a collection of CqQuery objects.
*
* @since 5.5
* @return CqQuery[] list of registered CQs,
* null if there are no CQs.
*/
public CqQuery[] getCqs();
/**
* Retrieves all the registered Continuous Queries for a given region.
* This is a collection of CqQuery objects.
*
* @since 5.5
* @return CqQuery[] list of registered CQs on the specified region,
* null if there are no CQs.
* @exception CqException
* if the region does not exist.
*/
public CqQuery[] getCqs(String regionName) throws CqException;
/**
* Retrieves the Continuous Query specified by the name.
*
* @since 5.5
* @param cqName - String, name of the CQ
* @return CqQuery object,
* null if no CqQuery object is found.
*/
public CqQuery getCq(String cqName);
/**
* Starts execution of all the registered continuous queries for this client.
* This is complementary to stopCqs.
* @see QueryService#stopCqs()
*
* @since 5.5
* @throws CqException if failure to execute CQ.
*/
public void executeCqs() throws CqException;
/**
* Stops execution of all the continuous queries for this client to become inactive.
* This is useful when client needs to control the incoming CQ messages during
* bulk region operations.
* @see QueryService#executeCqs()
*
* @since 5.5
* @throws CqException if failure to execute CQ.
*/
public void stopCqs() throws CqException;
/**
* Starts execution of all the continuous queries registered on the specified
* region for this client.
* This is complementary method to stopCQs().
* @see QueryService#stopCqs()
*
* @since 5.5
* @throws CqException if failure to stop CQs.
*/
public void executeCqs(String regionName) throws CqException;
/**
* Stops execution of all the continuous queries registered on the specified
* region for this client.
* This is useful when client needs to control the incoming CQ messages during
* bulk region operations.
* @see QueryService#executeCqs()
*
* @since 5.5
* @throws CqException if failure to execute CQs.
*/
public void stopCqs(String regionName) throws CqException;
/**
* Retrieves all the durable CQs registered by the client calling this method.
*
* @since 7.0
* @return List of names of registered durable CQs,
* empty list if no durable cqs.
*/
public List getAllDurableCqsFromServer() throws CqException;
/**
* Returns CqServiceStatistics object, which provides helper methods to
* get CQ service related statistics for this client.
* Specifically the following aggregate information on the client's CQs is collected:
* Number of CQs created (cumulative)
* Number of CQs active currently
* Number of CQs stopped or suspended currently
* Number of CQs closed (cumulative)
* Number of CQs active on a specified region currently
*
* @see CqServiceStatistics
*
* @since 5.5
* @return CqServiceStatistics
*
*/
public CqServiceStatistics getCqStatistics();
}
