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## edu.udo.cs.miningmart.compiler
Class CompilerAccessLogic

    java.lang.Object
      edu.udo.cs.miningmart.compiler.CompilerAccessLogic

All Implemented Interfaces:
  CompilerAccess, M4InterfaceContext

public class CompilerAccessLogic
extends java.lang.Object
implements M4InterfaceContext, CompilerAccess

Objects of this class realize a single thread executing a command to the compiler. This is used by the RMI interface class to create different instances for concurrent compiler instances, but also by the class `miningmart.compiler.CreateCompiler` to run a single local (non-RMI) instance for a single compiliation task (e.g. command line based).

Version:
  $Id: CompilerAccessLogic.java,v 1.11 2006/04/11 14:10:09 euler Exp $
Author:
  Martin Scholz
See Also:
  `edu.udo.cs.miningmart.compiler.CompilerAccessImpl`, `miningmart.compiler.CreateCompiler`

Constructor Summary
`CompilerAccessLogic(DB db, Print printObject)` This constructor takes all information needed from an existing database connection and shares the cache with the `DB` object!
`CompilerAccessLogic(java.lang.String myDbConfigFile)` Sets up a new instance of `CompilerAccessLogic`, using the default verbosity and the specified configuration file.
`CompilerAccessLogic(java.lang.String myDbConfigFile, java.util.logging.Level verbosity)` Sets up a new instance of `CompilerAccessLogic`, using the specified verbosity and configuration file.

Method Summary
`void` | `changeCompilerOutputVerbosity(long caseId, java.util.logging.Level newVerbosity)` Change the verbosity level of the compiler log messages for the given case.
`void` | `compileAll(long caseId, boolean lazyMode)` This method is given the ID of a `Case` to be compiled.
`void` | `compileAll(long caseId, boolean lazy, int verbosity)`
`void` | `compileRestOfCase(long caseId, boolean lazyMode)` A call to this method compiles only those steps of a case which have not already been compiled.
`void` | `compileStep(long stepId, boolean lazyMode)` This method is given the ID of the step to be compiled.
`void` | `compileStep(long stepId, boolean lazy, int verbosity)`
`void` | `compileStep(java.lang.String stepName, boolean lazyMode)` This method is given the name of the step to be compiled, as specified in table STEP_T, attribute ST_NAME.
`void` | `compileStepFrom(long stepId, boolean lazyMode)` This method is given the ID of the first `Step` of a subtree to be compiled.
`void` | `compileStepFrom(long stepId, boolean lazy, int verbosity)`
`void` | `compileStepTo(long stepId, boolean lazyMode, boolean ignoreCompiledStatus)` This method compiles all Steps that need to be compiled before the given Step can be compiled; then it compiles the given Step.
`void` | `deleteTrashForCase(long caseId)` Runs the garbage collection for all `Step`s of a specified `Case`.
`void` | `deleteTrashForStep(long stepId)` Runs the garbage collection for the specified `Step` and all subsequent dependent `Step`s with respect to the entries in the table STEPSEQUENCE_T.
`Case` | `getCase()`
`Print` | `getCurrentPrintObject()` Gets the instance of the `Case`-dependent `Print` object, if available.
`CompilerDatabaseService` | `getDb()` Gets the instance of class `DB` representing the database access to both the M4 and business schema.
`static ExecutableOperator` | `getExecutableOperator(Operator operator)` This method bridges the gap between the M4 operator objects and the executable operators.
`DB` | `getM4db()` Same as getDb(), but with less specific return type for the implemented interface.
`Print` | `getPrintObject()`
`java.lang.String` | `getStatusFromLine(long caseId, int lineNumber)` Reads the status message of a running compiler server thread.
`java.lang.String` | `getStatusMessage(long caseId, int numberOfLines)` Reads the status message of a running compiler server thread.
`boolean` | `getStopRequest()` Checked to decide, if an exception should be thrown to stop execution.
`boolean` | `isReadyForCompilation(long stepId)` This method checks for a given `Step`, if it can currently be compiled.
`boolean` | `killCompilerThread(long caseId)` This method kills a running compiler thread.
`void` | `updateColumnsetStatistics(long columnsetID)` Uses the stored procedures of the database to update the statistics of the specified column set and of all the columns contained in the column set.
`void` | `updateColumnStatistics(long columnID)` Uses the stored procedures of the database to update the statistics of the specified column.
`void` | `updateStatisticsForConcept(long conceptID)` Uses the stored procedures of the database to update all the statistics which are related to the specified concept.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### CompilerAccessLogic

    public CompilerAccessLogic(DB db,
                               Print printObject)

  This constructor takes all information needed from an existing database connection and shares the cache with the `DB` object!

Parameters:
  `db` - an existing database connection object of type `DB`
  `printObject` - the Print object to be used for log messages

### CompilerAccessLogic

    public CompilerAccessLogic(java.lang.String myDbConfigFile)
                        throws java.io.IOException,
                               java.sql.SQLException

  Sets up a new instance of `CompilerAccessLogic`, using the default verbosity and the specified configuration file.

Parameters:
  `myDbConfigFile` - the path to the configuration file describing the settings of the database
See Also:
  `miningmart.compiler.utils.Print`

### CompilerAccessLogic

    public CompilerAccessLogic(java.lang.String myDbConfigFile,
                               java.util.logging.Level verbosity)
                        throws java.io.IOException,
                               java.sql.SQLException

  Sets up a new instance of `CompilerAccessLogic`, using the specified verbosity and configuration file.

Parameters:
  `myDbConfigFile` - the path to the configuration file describing the settings of the database
  `verbosity` - the verbosity of the `Print` object associated with `this` object.
See Also:
  `miningmart.compiler.utils.Print`

Method Detail

### compileStep

    public void compileStep(long stepId,
                            boolean lazyMode)
                     throws M4CompilerInterfaceError,
                            M4CompilerWarning,
                            UserError

  Description copied from interface: `CompilerAccess`
  This method is given the ID of the step to be compiled. If the lazy mode flag is set, then a less time consuming execution is performed.

  An exception is thrown if the step is not present in the according M4 table, if parameters are missing, if references are invalid, if the database connection fails or if the execution of an operator fails.

  Specified by:
    `compileStep` in interface `CompilerAccess`
  Parameters:
    `stepId` - the ID of the step in STEP_T
    `lazyMode` - a flag indicating if the compiler should run in lazy mode or not
  Throws:
    `M4CompilerInterfaceError`
    `M4CompilerWarning`
    `UserError`
  See Also:
    `edu.udo.cs.miningmart.compiler.CompilerAccessImpl#compileStep(long, boolean)`

### compileStep

    public void compileStep(java.lang.String stepName,
                            boolean lazyMode)
                     throws M4CompilerInterfaceError,
                            M4CompilerWarning,
                            UserError

  Description copied from interface: `CompilerAccess`
  This method is given the name of the step to be compiled, as specified in table STEP_T, attribute ST_NAME. If the lazy mode flag is set, then a less time consuming execution is performed.

  An exception is thrown if the step is not present in the according M4 table, if parameters are missing, if references are invalid, if the database connection fails or if the execution of an operator fails.

  Specified by:
    `compileStep` in interface `CompilerAccess`
  Parameters:
    `stepName` - the name of the step in STEP_T
    `lazyMode` - a flag indicating if the compiler should run in lazy mode or not
  Throws:
    `M4CompilerInterfaceError`
    `M4CompilerWarning`
    `UserError`
  See Also:
    `edu.udo.cs.miningmart.compiler.CompilerAccessImpl#compileStep(String, boolean)`

### getExecutableOperator

    public static ExecutableOperator getExecutableOperator(Operator operator)
                                                    throws M4CompilerError

  This method bridges the gap between the M4 operator objects and the executable operators. It reads an operator class name, as delivered e.g. by `Step.getOperatorClass()` and returns an executable operator.

  Returns:
    an instantiated `ExecutableOperator`
  Throws:
    `M4CompilerError`

### compileAll

    public void compileAll(long caseId,
                           boolean lazyMode)
                    throws M4CompilerInterfaceError,
                           M4CompilerWarning,
                           UserError

  Description copied from interface: `CompilerAccess`
  This method is given the ID of a `Case` to be compiled. The compiler calculates a valid sequential order of the embedded `step`s with respect to the constraints introduced by the STEPSEQUENCE_T table. If the lazy mode flag is set, then a less time consuming execution is performed.

  An exception is thrown if there is no valid sequence (e.g. cyclic dependencies), if there are no steps connected to the given case, if parameters are missing, if references are invalid, if the database connection fails or if the execution of an operator fails.

  Specified by:
    `compileAll` in interface `CompilerAccess`
  Parameters:
    `caseId` - the ID of the case to be compiled
    `lazyMode` - a flag indicating if the compiler should run in lazy mode or not
  Throws:
    `M4CompilerInterfaceError`
    `M4CompilerWarning`
    `UserError`
  See Also:
    `edu.udo.cs.miningmart.compiler.CompilerAccessImpl#compileAll(long, boolean)`

### compileStepFrom

    public void compileStepFrom(long stepId,
                                boolean lazyMode)
                         throws M4CompilerInterfaceError,
                                M4CompilerWarning,
                                UserError

  Description copied from interface: `CompilerAccess`
  This method is given the ID of the first `Step` of a subtree to be compiled. The compiler calculates a valid sequential order of the subtree defined by and with respect to the constraints introduced by the STEPSEQUENCE_T table. If the lazy mode flag is set, then a less time consuming execution is performed.

  An exception is thrown if there is no valid sequence (e.g. cyclic dependencies), if there are no steps connected to the given case, if parameters are missing, if references are invalid, if the database connection fails or if the execution of an operator fails.

  Specified by:
    `compileStepFrom` in interface `CompilerAccess`
  Parameters:
    `stepId` - the ID of the first step to be compiled
    `lazyMode` - a flag indicating if the compiler should run in lazy mode or not
  Throws:
    `M4CompilerInterfaceError`
    `M4CompilerWarning`
    `UserError`
  See Also:
    `edu.udo.cs.miningmart.compiler.CompilerAccessImpl#compileStepFrom(long, boolean)`

### compileStepTo

    public void compileStepTo(long stepId,
                              boolean lazyMode,
                              boolean ignoreCompiledStatus)
                       throws M4CompilerInterfaceError,
                              M4CompilerWarning,
                              UserError

  Description copied from interface: `CompilerAccess`
  This method compiles all Steps that need to be compiled before the given Step can be compiled; then it compiles the given Step.

  Specified by:
    `compileStepTo` in interface `CompilerAccess`
  Parameters:
    `stepId` - the ID of the last step to be compiled
    `lazyMode` - a flag indicating if the compiler should run in lazy mode or not
    `ignoreCompiledStatus` - if TRUE, only the graph structure determines which Steps are compiled. If FALSE, only those Steps among the predecessors of the given Step are compiled that have not been compiled yet. In the latter case, only Steps on the shortest paths from a compiled step to the given Step are compiled, and no Steps that precede an already compiled Step are compiled.
  Throws:
    `M4CompilerInterfaceError`
    `M4CompilerWarning`
    `UserError`
  See Also:
    `edu.udo.cs.miningmart.compiler.CompilerAccessImpl#compileStepTo(long, boolean)`

### updateColumnStatistics

    public void updateColumnStatistics(long columnID)
                                throws M4CompilerInterfaceError

  Description copied from interface: `CompilerAccess`
  Uses the stored procedures of the database to update the statistics of the specified column.

  Specified by:
    `updateColumnStatistics` in interface `CompilerAccess`
  Parameters:
    `columnID` - the ID of column set in table COLUMN_T for which the statistics shall be updated
  Throws:
    `M4CompilerInterfaceError`
  See Also:
    `edu.udo.cs.miningmart.compiler.CompilerAccessImpl#updateColumnStatistics(long)`

### updateColumnsetStatistics

    public void updateColumnsetStatistics(long columnsetID)
                                   throws M4CompilerInterfaceError

  Description copied from interface: `CompilerAccess`
  Uses the stored procedures of the database to update the statistics of the specified column set and of all the columns contained in the column set.

  Specified by:
    `updateColumnsetStatistics` in interface `CompilerAccess`
  Parameters:
    `columnsetID` - the ID of column set in table COLUMNSET_T for which the statistics shall be updated
  Throws:
    `M4CompilerInterfaceError`
  See Also:
    `edu.udo.cs.miningmart.compiler.CompilerAccessImpl#updateColumnsetStatistics(long)`

### updateStatisticsForConcept

    public void updateStatisticsForConcept(long conceptID)
                                    throws M4CompilerInterfaceError

  Description copied from interface: `CompilerAccess`
  Uses the stored procedures of the database to update all the statistics which are related to the specified concept. These are the statistics of the related column sets and of all the columns contained.

  Specified by:
    `updateStatisticsForConcept` in interface `CompilerAccess`
  Parameters:
    `conceptID` - the ID of the concept in table CONCEPT_T for which the statistics shall be updated
  Throws:
    `M4CompilerInterfaceError`
  See Also:
    `edu.udo.cs.miningmart.compiler.CompilerAccessImpl#updateStatisticsForConcept(long)`

### deleteTrashForStep

    public void deleteTrashForStep(long stepId)
                            throws M4CompilerInterfaceError

  Description copied from interface: `CompilerAccess`
  Runs the garbage collection for the specified `Step` and all subsequent dependent `Step`s with respect to the entries in the table STEPSEQUENCE_T.

  Specified by:
    `deleteTrashForStep` in interface `CompilerAccess`
  Parameters:
    `stepId` - the ID of the (first) `Step` to run the garbage collection for.
  Throws:
    `M4CompilerInterfaceError`
  See Also:
    `edu.udo.cs.miningmart.compiler.CompilerAccessImpl#deleteTrashForStep(long)`

### deleteTrashForCase

    public void deleteTrashForCase(long caseId)
                            throws M4CompilerInterfaceError

  Description copied from interface: `CompilerAccess`
  Runs the garbage collection for all `Step`s of a specified `Case`.

  Specified by:
    `deleteTrashForCase` in interface `CompilerAccess`
  Parameters:
    `caseId` - of the `Case` to run the garbage collection for.
  Throws:
    `M4CompilerInterfaceError`
  See Also:
    `edu.udo.cs.miningmart.compiler.CompilerAccessImpl#deleteTrashForCase(long)`

### getStatusMessage

    public java.lang.String getStatusMessage(long caseId,
                                             int numberOfLines)
                                      throws M4CompilerInterfaceError

  Description copied from interface: `CompilerAccess`
  Reads the status message of a running compiler server thread.

  Specified by:
    `getStatusMessage` in interface `CompilerAccess`
  Parameters:
    `caseId` - the id of the case to receive log information for. Because of the case locking mechanism each case is never compiled more than once at the same time, so this is a unique Thread identifier. A caseId of 0 or lower is interpreted as the default Print class, used before having found the right case or in case of severe errors.
    `numberOfLines` - the numberOfLines to be returned
  Returns:
    the last number of lines from the status logfile of the thread The first line holds the line number after the last line, so that using this number as the line number in the next call will return the log messages collected in between.
  Throws:
    `M4CompilerInterfaceError`
  See Also:
    `edu.udo.cs.miningmart.compiler.CompilerAccessImpl#getStatusMessage(long, int)`

### getStatusFromLine

    public java.lang.String getStatusFromLine(long caseId,
                                              int lineNumber)
                                       throws M4CompilerInterfaceError

  Description copied from interface: `CompilerAccess`
  Reads the status message of a running compiler server thread. A start line number is specified. The log messages starting from this line number up to the end are returned.

  Specified by:
    `getStatusFromLine` in interface `CompilerAccess`
  Parameters:
    `caseId` - the id of the case to receive log information for. Because of the case locking mechanism each case is never compiled more than once at the same time, so this is a unique Thread identifier. A caseId of 0 or lower is interpreted as the default Print class, used before having found the right case or in case of severe errors.
    `lineNumber` - the first line of the logfile to be returned
  Returns:
    the last lines from the status logfile of the thread, starting with the lineNumber specified as a parameter.
  Throws:
    `M4CompilerInterfaceError`
  See Also:
    `edu.udo.cs.miningmart.compiler.CompilerAccessImpl#getStatusFromLine(long, int)`

### changeCompilerOutputVerbosity

    public void changeCompilerOutputVerbosity(long caseId,
                                              java.util.logging.Level newVerbosity)
                                       throws M4CompilerInterfaceError

  Description copied from interface: `CompilerAccess`
  Change the verbosity level of the compiler log messages for the given case.

  Specified by:
    `changeCompilerOutputVerbosity` in interface `CompilerAccess`
  Parameters:
    `caseId` - the id of the case to receive log information for. Because of the case locking mechanism each case is never compiled more than once at the same time, so this is a unique Thread identifier. A caseId of 0 or lower is interpreted as the default Print class, used before having found the right case or in case of severe errors.
    `newVerbosity` - The new verbosity. Use one of the public constants of the class edu.udo.cs.miningmart.m4.utils.Print, if possible.
  Throws:
    `M4CompilerInterfaceError`
  See Also:
    `edu.udo.cs.miningmart.compiler.CompilerAccessImpl#changeCompilerOutputVerbosity(long, int)`

### isReadyForCompilation

    public boolean isReadyForCompilation(long stepId)
                                  throws M4CompilerInterfaceError

  Description copied from interface: `CompilerAccess`
  This method checks for a given `Step`, if it can currently be compiled. Validity aspects are not checked, but for all `Step`s the given `Step` depends on (regarding to STEPSEQUENCE_T) it is made sure that they have recently (after the last garbage collection) been compiled, so the outputs of these `Step`s are available in the database.

  Specified by:
    `isReadyForCompilation` in interface `CompilerAccess`
  Parameters:
    `stepId` - the ID of the `Step`
  Returns:
    if all `Step`s this `Step` depends on have been compiled
  Throws:
    `M4CompilerInterfaceError`
  See Also:
    `edu.udo.cs.miningmart.compiler.CompilerAccessImpl#isReadyForCompilation(long)`

### compileRestOfCase

    public void compileRestOfCase(long caseId,
                                  boolean lazyMode)
                           throws M4CompilerInterfaceError,
                                  M4CompilerWarning

  A call to this method compiles only those steps of a case which have not already been compiled. Please note that for eager mode it is not checked, whether all steps compiled earlier were also compiled in eager mode!

  Parameters:
    `caseId` - the ID of the case to be compiled
    `lazyMode` - indicates if the steps should be compiled in lazy mode
  Throws:
    `M4CompilerInterfaceError`
    `M4CompilerWarning`

### getDb

    public CompilerDatabaseService getDb()

  Gets the instance of class `DB` representing the database access to both the M4 and business schema.

  Returns:
    the DB object for the current thread

### getM4db

    public DB getM4db()

  Same as getDb(), but with less specific return type for the implemented interface.

  Specified by:
    `getM4db` in interface `M4InterfaceContext`

### getCurrentPrintObject

    public Print getCurrentPrintObject()

  Gets the instance of the `Case`-dependent `Print` object, if available. If no such object could be set up, yet, then the default `Print` object is returned instead.

  Returns:
    a `Print` object to be used in the current compiler run

### getStopRequest

    public boolean getStopRequest()

  Checked to decide, if an exception should be thrown to stop execution.

  Specified by:
    `getStopRequest` in interface `M4InterfaceContext`
  Returns:
    `true` iff the Thread should not continue.

### getCase

    public Case getCase()

  Specified by:
    `getCase` in interface `M4InterfaceContext`
  Returns:
    the `Case` associated with this CompilerAccessLogic object.

### getPrintObject

    public Print getPrintObject()

  Specified by:
    `getPrintObject` in interface `M4InterfaceContext`
  See Also:
    `miningmart.compiler.utils.CompilerAccessLogic.getPrintObject()`

### compileAll

    public void compileAll(long caseId,
                           boolean lazy,
                           int verbosity)
                    throws M4CompilerInterfaceError,
                           M4CompilerWarning,
                           UserError

  Throws:
    `M4CompilerInterfaceError`
    `M4CompilerWarning`
    `UserError`

### compileStep

    public void compileStep(long stepId,
                            boolean lazy,
                            int verbosity)
                     throws M4CompilerInterfaceError,
                            M4CompilerWarning,
                            UserError

  Throws:
    `M4CompilerInterfaceError`
    `M4CompilerWarning`
    `UserError`

### compileStepFrom

    public void compileStepFrom(long stepId,
                                boolean lazy,
                                int verbosity)
                         throws M4CompilerInterfaceError,
                                M4CompilerWarning,
                                UserError

  Throws:
    `M4CompilerInterfaceError`
    `M4CompilerWarning`
    `UserError`

### killCompilerThread

    public boolean killCompilerThread(long caseId)

  Description copied from interface: `CompilerAccess`
  This method kills a running compiler thread. Threads are identified by the `Case` they are compiling. Nevertheless, for a few seconds after launching a `compileStep` command this method may not succeed in identifying the right Thread. For this reason, there is a return value. It is a good idea to send kill request until `true` is returned. A Thread is killed by a special exception, which is finally translated to an `M4CompilerInterfaceError`.

  Specified by:
    `killCompilerThread` in interface `CompilerAccess`
  Parameters:
    `caseId` - The ID of the case for which the compiler thread should be killed.
  Returns:
    `true` iff a thread for the given case has been found and the the kill flag has been set.

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