com.tangosol.coherence.dslquery

Interface Statement

All Known Implementing Classes:

AbstractQueryPlusStatementBuilder.AbstractStatement, AbstractSnapshotStatement, AbstractStatement, ArchiveSnapshotStatementBuilder.ArchiveSnapshotStatement, BackupStatementBuilder.BackupStatement, CommandsStatementBuilder.CommandsQueryPlusStatement, CreateCacheStatementBuilder.CreateCacheStatement, CreateIndexStatementBuilder.CreateIndexStatement, CreateSnapshotStatementBuilder.CreateSnapshotStatement, DeleteStatementBuilder.DeleteStatement, DropCacheStatementBuilder.DropCacheStatement, DropIndexStatementBuilder.DropIndexStatement, ExtendedLanguageStatementBuilder.ExtendedLanguageQueryPlusStatement, ForceRecoveryStatementBuilder.ForceRecoveryStatement, HelpStatementBuilder.HelpQueryPlusStatement, InsertStatementBuilder.InsertStatement, ListArchiverStatementBuilder.ListArchiverStatement, ListServicesStatementBuilder.ListServicesStatement, ListSnapshotsStatementBuilder.ListSnapshotsStatement, QueryRecorderStatementBuilder.QueryRecorderStatement, RecoverSnapshotStatementBuilder.RecoverSnapshotStatement, RemoveSnapshotStatementBuilder.RemoveSnapshotStatement, RestoreStatementBuilder.RestoreStatement, ResumeServiceStatementBuilder.ResumeServiceStatement, RetrieveSnapshotStatementBuilder.RetrieveSnapshotStatement, SanityCheckStatementBuilder.SanityCheckQueryPlusStatement, SelectStatementBuilder.SelectStatement, ServicesStatementBuilder.ServicesQueryPlusStatement, SetTimeoutStatementBuilder.SetTimeoutStatement, SourceStatementBuilder.SourceStatement, SuspendServiceStatementBuilder.SuspendServiceStatement, TraceStatementBuilder.TraceQueryPlusStatement, TruncateCacheStatementBuilder.TruncateCacheStatement, UpdateStatementBuilder.UpdateStatement, ValidateSnapshotStatementBuilder.ValidateSnapshotStatement, WheneverStatementBuilder.WheneverQueryPlusStatement

public interface Statement

Implementations of this interface are able to execute CohQL statements, for example a Select, Update, a backup command etc.

Each execution is provided a context in which to execute the statement and is obliged to return a result to the caller. Ths allows the caller to invoke statement agnostic operations, which each implementation can specialize based on the format of the results.

Since:

Coherence 12.2.1

Author:

jk 2013.12.09

See Also:

StatementResult

Method Summary

Modifier and Type	Method and Description
StatementResult	execute(ExecutionContext ctx) Execute a CohQL query or command and return the relevant result.
String	getExecutionConfirmation(ExecutionContext ctx) Return a string that will be used as a question to confirm execution of a statement.
default boolean	isManagingTimeout() Obtain a flag indicating whether this Statement will manage its own timeout handling.
void	sanityCheck(ExecutionContext ctx) Perform sanity checks on the statement that will be executed.
void	showPlan(PrintWriter out) Output to the provided PrintWriter a human readable trace of the actions that will be taken by this statement if or when executed.

Method Detail

execute

StatementResult execute(ExecutionContext ctx)

Execute a CohQL query or command and return the relevant result.

Parameters:

ctx - the context to use

Returns:

a StatementResult containing the results of executing the statement

sanityCheck

void sanityCheck(ExecutionContext ctx)

Perform sanity checks on the statement that will be executed.

Implementations can fail sanity checking by throwing an unchecked exception (RuntimeException).

Parameters:

ctx - the context to use

Throws:

RuntimeException - if sanity checking fails

showPlan

void showPlan(PrintWriter out)

Output to the provided PrintWriter a human readable trace of the actions that will be taken by this statement if or when executed.

Parameters:

out - the PrintWriter to write the trace to

getExecutionConfirmation

String getExecutionConfirmation(ExecutionContext ctx)

Return a string that will be used as a question to confirm execution of a statement. If null is returned then no confirmation is required.

Parameters:

ctx - the context to use

Returns:

a String that will be used to confirm execution of a statement

isManagingTimeout

default boolean isManagingTimeout()

Obtain a flag indicating whether this Statement will manage its own timeout handling.

Returns:

true if this Statement manages timeout handling or false if the StatementExecutor should manage timeouts.