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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 com.gemstone.gemfire.cache.Region;
import com.gemstone.gemfire.cache.execute.Function;
import com.gemstone.gemfire.cache.execute.FunctionContext;
import com.gemstone.gemfire.cache.execute.FunctionService;
import com.gemstone.gemfire.cache.execute.RegionFunctionContext;
/**
* Interface for query objects. Supports execution of queries with optional
* parameters.
*
* @author Eric Zoerner
* @since 4.0
*/
public interface Query {
/**
* Return the original query string that was specified in the constructor.
* @return the original query string
*/
public String getQueryString();
/**
* Executes this query and returns an object that represent its
* result. If the query resolves to a primitive type, an instance
* of the corresponding wrapper type ({@link java.lang.Integer},
* etc.) is returned. If the query resolves to more than one
* object, a {@link SelectResults} is returned.
*
* Query execution can potentially take a long time depending on
* data size and query complexity. The system property
* "gemfire.Cache.MAX_QUERY_EXECUTION_TIME" can be set to define the
* maximum time allowed for a query to complete its execution. If query
* execution time exceeds "gemfire.Cache.MAX_QUERY_EXECUTION_TIME",
* then the query is canceled and QueryExecutionTimeoutException is
* thrown back to the caller, if the execution is local to the VM.
* If the canceled query was initiated by a GemFire client, then a
* QueryException is thrown on the client with its cause set to
* QueryExecutionTimeoutException. This timeout does not account for
* the time taken to construct the results after execution completes
* and the results returned to the caller.
*
* @return The object that represents the result of the query. Note that if
* a query is just a select statement then it will return a result
* that is an instance of {@link SelectResults}. However, since a query is not
* necessarily just a select statement, the return type of this
* method is Object.
* For example, the query (select distinct * from /rgn).size
* returns an instance of java.lang.Integer.
*
* @throws FunctionDomainException
* A function was applied to a parameter that is improper
* for that function. For example, the ELEMENT function
* was applied to a collection of more than one element
* @throws TypeMismatchException
* If a bound parameter is not of the expected type.
* @throws NameResolutionException
* If a name in the query cannot be resolved.
* @throws IllegalArgumentException
* The number of bound parameters does not match the number
* of placeholders
* @throws IllegalStateException
* If the query is not permitted on this type of region
* @throws QueryExecutionTimeoutException
* If the query gets canceled due to setting system variable
* "gemfire.Cache.MAX_QUERY_EXECUTION_TIME". This is a thrown when
* query is executed on the local regions (embedded mode).
* @throws QueryInvocationTargetException
* If the data referenced in from clause is not available for
* querying.
* @throws QueryExecutionLowMemoryException
* If the query gets canceled due to low memory conditions and
* the resource manager critical heap percentage has been set
*/
public Object execute()
throws FunctionDomainException, TypeMismatchException, NameResolutionException,
QueryInvocationTargetException;
/**
* Executes this query with the given parameters and returns an
* object that represent its result. If the query resolves to a
* primitive type, an instance of the corresponding wrapper type
* ({@link java.lang.Integer}, etc.) is returned. If the query
* resolves to more than one object, a {@link SelectResults} is
* returned.
*
* Query execution can potentially take a long time depending on
* data size and query complexity. The system property
* "gemfire.Cache.MAX_QUERY_EXECUTION_TIME" can be set to define the
* maximum time allowed for a query to complete its execution. If query
* execution time exceeds "gemfire.Cache.MAX_QUERY_EXECUTION_TIME",
* then the query is canceled and QueryExecutionTimeoutException is
* thrown back to the caller, if the execution is local to the VM.
* If the canceled query was initiated by a GemFire client, then a
* QueryException is thrown on the client with its cause set to
* QueryExecutionTimeoutException. This timeout does not account for
* the time taken to construct the results after execution completes
* and the results returned to the caller.
* @param params
* Values that are bound to parameters (such as
* $1) in this query.
*
* @return The object that represents the result of the query. Note that if
* a query is just a select statement then it will return a result
* that is an instance of {@link SelectResults}. However, since a query is not
* necessarily just a select statement, the return type of this
* method is Object.
* For example, the query (select distinct * from /rgn).size
* returns an instance of java.lang.Integer.
*
* @throws FunctionDomainException
* A function was applied to a parameter that is improper
* for that function. For example, the ELEMENT function
* was applied to a collection of more than one element
* @throws TypeMismatchException
* If a bound parameter is not of the expected type.
* @throws NameResolutionException
* If a name in the query cannot be resolved.
* @throws IllegalArgumentException
* The number of bound parameters does not match the number
* of placeholders
* @throws IllegalStateException
* If the query is not permitted on this type of region
* @throws QueryExecutionTimeoutException
* If the query gets canceled due to setting system variable
* "gemfire.Cache.MAX_QUERY_EXECUTION_TIME". This is a thrown when
* query is executed on the local regions (embedded mode).
* @throws QueryInvocationTargetException
* If the data referenced in from clause is not available for
* querying.
* @throws QueryExecutionLowMemoryException
* If the query gets canceled due to low memory conditions and
* the resource manager critical heap percentage has been set
*
*/
public Object execute(Object[] params)
throws FunctionDomainException, TypeMismatchException, NameResolutionException,
QueryInvocationTargetException;
/**
* Executes this query on the partitioned data-store associated with the given
* RegionFunctionContext and returns an object that represents its result. An
* Exception is thrown when data-set associated with the {@link RegionFunctionContext}
* gets moved or destroyed from the local node.
*
* The RegionFunctionContext defines the execution context of a data dependent
* {@link Function}. And is obtained when the function is executed using
* {@link FunctionService#onRegion(Region)}, the
* {@link Function#execute(FunctionContext) FunctionContext}
*
* E.g.: // Function service execute() method:
*
* public void execute(FunctionContext context) {
* RegionFunctionContext regionContext = (RegionFunctionContext)context;
* Query query = cache.getQueryService().newQuery("Select * from /MyRegion");
* SelectResults results = (SelectResults)query.execute(regionContext);
* }
*
* Using this method a join query query can be executed between two co-located
* PartitionRegion data-set referenced through {@link RegionFunctionContext}.
*
* This method should NOT be used for multiple partitioned regions based join
* queries. We support equi-join queries only on co-located PartitionedRegions
* if the the co-located columns ACTUALLY EXIST IN WHERE CLAUSE and in case of
* multi-column partitioning , should have "AND" clause.
*
* E.g.: // Equi-join query:
*
* Select * from /partitionRegion1 p1, /PartitionRegion2 p2 where
* p1.field = p2.field [AND .....]
*
* @since 6.2.2
* @param context RegionFunctionContext which will target the query on subset
* of data if executed on PartitionedRegion.
*
* @return The object that represents the result of the query. Note that if a
* query is just a select statement then it will return a result that
* is an instance of {@link SelectResults}. However, since a query is
* not necessarily just a select statement, the return type of this
* method is Object. For example, the query
* (select distinct * from /rgn).size returns an
* instance of java.lang.Integer.
*
* @throws FunctionDomainException A function was applied to a parameter that
* is improper for that function. For example, the ELEMENT function
* was applied to a collection of more than one element
* @throws TypeMismatchException If a bound parameter is not of the expected
* type.
* @throws NameResolutionException If a name in the query cannot be resolved.
* @throws IllegalArgumentException The number of bound parameters does not
* match the number of place holders
* @throws IllegalStateException If the query is not permitted on this type of
* region
* @throws QueryExecutionTimeoutException If the query gets canceled due to
* setting system variable "gemfire.Cache.MAX_QUERY_EXECUTION_TIME".
* This is a thrown when query is executed on the local regions
* (embedded mode).
* @throws QueryInvocationTargetException
* If the data referenced in from clause is not available for
* querying.
* @throws QueryExecutionLowMemoryException
* If the query gets canceled due to low memory conditions and
* the resource manager critical heap percentage has been set
*/
public Object execute(RegionFunctionContext context)
throws FunctionDomainException, TypeMismatchException, NameResolutionException,
QueryInvocationTargetException;
/**
* Executes this query on the partitioned data-store associated with the given
* RegionFunctionContext and parameters and returns an object that represents
* its result. An Exception is thrown if data moving across nodes (Like,
* partitioned data-store rebalancing) coincides with data to be queried.
*
* The RegionFunctionContext defines the execution context of a data dependent
* {@link Function}. And is obtained when the function is executed using
* {@link FunctionService#onRegion(Region)}, the
* {@link Function#execute(FunctionContext) FunctionContext}
*
* E.g.: // Function service execute() method:
*
* public void execute(FunctionContext context) {
* RegionFunctionContext regionContext = (RegionFunctionContext)context;
* Query query = cache.getQueryService().newQuery("Select * from /MyRegion");
* SelectResults results = (SelectResults)query.execute(regionContext);
* }
*
* Using this method a join query query can be executed between two co-located
* PartitionRegion data-set referenced through {@link RegionFunctionContext}.
*
* This method should NOT be used for multiple partitioned regions based join
* queries. We support equi-join queries only on co-located PartitionedRegions
* if the the co-located columns ACTUALLY EXIST IN WHERE CLAUSE and in case of
* multi-column partitioning , should have "AND" clause.
*
* E.g.: // Equi-join query:
*
* Select * from /partitionRegion1 p1, /PartitionRegion2 p2 where
* p1.field = p2.field [AND .....]
*
* @since 6.2.2
* @param context RegionFunctionContext which will target the query on subset
* of data if executed on PartitionedRegion.
* @param params Values that are bound to parameters (such as $1)
* in this query.
*
* @return The object that represents the result of the query. Note that if a
* query is just a select statement then it will return a result that
* is an instance of {@link SelectResults}. However, since a query is
* not necessarily just a select statement, the return type of this
* method is Object. For example, the query
* (select distinct * from /rgn).size returns an
* instance of java.lang.Integer.
*
* @throws FunctionDomainException A function was applied to a parameter that
* is improper for that function. For example, the ELEMENT function
* was applied to a collection of more than one element
* @throws TypeMismatchException If a bound parameter is not of the expected
* type.
* @throws NameResolutionException If a name in the query cannot be resolved.
* @throws IllegalArgumentException The number of bound parameters does not
* match the number of place holders
* @throws IllegalStateException If the query is not permitted on this type of
* region
* @throws QueryExecutionTimeoutException If the query gets canceled due to
* setting system variable "gemfire.Cache.MAX_QUERY_EXECUTION_TIME".
* This is a thrown when query is executed on the local regions
* (embedded mode).
* @throws QueryInvocationTargetException
* If the data referenced in from clause is not available for
* querying.
* @throws QueryExecutionLowMemoryException
* If the query gets canceled due to low memory conditions and
* the resource manager critical heap percentage has been set
*/
public Object execute(RegionFunctionContext context, Object[] params)
throws FunctionDomainException, TypeMismatchException, NameResolutionException,
QueryInvocationTargetException;
/**
* Compiles this Query to achieve higher performance
* execution.
*
* @throws TypeMismatchException
* If the compile-time type of a name, parameter, or
* expression is not the expected type
* @throws QueryInvalidException
* The syntax of the query string is not correct
* @deprecated as of 6.5
*/
@Deprecated
public void compile()
throws TypeMismatchException, NameResolutionException;
/**
* Return whether this query has been compiled into VM bytecodes.
* @return true if this query has been compiled into bytecodes
* @deprecated as of 6.5
*/
@Deprecated
public boolean isCompiled();
/**
* Get statistics information for this query.
*/
public QueryStatistics getStatistics();
}