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Groovy example source code file (SqlCacheTest.groovy)

This example Groovy source code file (SqlCacheTest.groovy) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

connection, datasource, food, from, from, jdbc, not, person, person, person_food, select, select, sql, sql, where, where

The Groovy SqlCacheTest.groovy source code

/*
 * Copyright 2003-2009 the original author or authors.
 *
 * 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.
 */
package groovy.sql

import java.sql.SQLException
import javax.sql.DataSource
import java.sql.Connection
import org.codehaus.groovy.runtime.InvokerHelper

/**
 * Unit test of Sql cache feature 
 * @author Marc DeXeT
 * @author Paul King
 */
class SqlCacheTest extends GroovyTestCase {
    Sql sql
    Connection wrappedCon
    Connection con
    DataSource ds
    int prepareStatementExpectedCall
    int prepareStatementCallCounter
    int createStatementExpectedCall
    int createStatementCallCounter

    void setUp() {
        ds = new org.hsqldb.jdbc.jdbcDataSource()
        ds.database = "jdbc:hsqldb:mem:foo" + getMethodName()
        ds.user = 'sa'
        ds.password = ''
        con = ds.getConnection()
        def methodOverride = [
                createStatement: {Object[] args ->
                    createStatementCallCounter++
                    assert !createStatementExpectedCall || createStatementCallCounter <= createStatementExpectedCall
                    InvokerHelper.invokeMethod(con, 'createStatement', args)
                },
                prepareStatement: {String sql ->
                    prepareStatementCallCounter++
                    assert !prepareStatementExpectedCall || prepareStatementCallCounter <= prepareStatementExpectedCall
                    con.prepareStatement(sql)
                }
        ]
        wrappedCon = ProxyGenerator.INSTANCE.instantiateDelegate(methodOverride, [Connection], con)
        sql = new Sql(wrappedCon)
        sql.execute("create table PERSON ( id integer, firstname varchar, lastname varchar )")
        sql.execute("create table FOOD ( id integer, type varchar, name varchar)")
        sql.execute("create table PERSON_FOOD ( personid integer, foodid integer)")

        // now let's populate the datasets
        def people = sql.dataSet("PERSON")
        people.add(id: 1, firstname: "James", lastname: "Strachan")
        people.add(id: 2, firstname: "Bob", lastname: "Mcwhirter")
        people.add(id: 3, firstname: "Sam", lastname: "Pullara")
        people.add(id: 4, firstname: "Jean", lastname: "Gabin")
        people.add(id: 5, firstname: "Lino", lastname: "Ventura")

        def food = sql.dataSet("FOOD")
        food.add(id: 1, type: "cheese", name: "edam")
        food.add(id: 2, type: "cheese", name: "brie")
        food.add(id: 3, type: "cheese", name: "cheddar")
        food.add(id: 4, type: "drink", name: "beer")
        food.add(id: 5, type: "drink", name: "coffee")

        def person_food = sql.dataSet("PERSON_FOOD")
        person_food.add(personid: 1, foodid: 1)
        person_food.add(personid: 1, foodid: 4)
        person_food.add(personid: 2, foodid: 2)
        person_food.add(personid: 3, foodid: 5)
        person_food.add(personid: 4, foodid: 1)
        person_food.add(personid: 4, foodid: 2)
        person_food.add(personid: 4, foodid: 3)
        person_food.add(personid: 99, foodid: 99)

        prepareStatementCallCounter = 0
    }

    /**
     * Validation of ConnectionWrapper expectation.
     */
    void testValidateWrappedConnectionStatementCall() {
        prepareStatementCallCounter = 0
        prepareStatementExpectedCall = 1
        try {
            wrappedCon.prepareStatement("SELECT * FROM PERSON")
            wrappedCon.prepareStatement("SELECT * FROM PERSON")
            fail("Exception must be raised")
        } catch (AssertionError e) {
            assert prepareStatementCallCounter == 2
        }
    }

    void testCachePreparedStatements() {
        prepareStatementCallCounter = 0
        prepareStatementExpectedCall = 3
        sql.cacheStatements { ->
            invokeQuery()
        }
        assert prepareStatementCallCounter == 3 // 3 diff statements
        sql.close()
    }

    void testCacheConnection() {
        prepareStatementCallCounter = 0
        sql.cacheConnection {
            invokeQuery()
        }
        assert prepareStatementCallCounter == 13
    }

    void testNotCacheStatements() {
        prepareStatementCallCounter = 0
        invokeQuery()
        assert prepareStatementCallCounter == 13
        sql.close()
    }

    private invokeQuery() {
        sql.eachRow("SELECT * FROM PERSON", []) { person ->
            sql.eachRow("SELECT * FROM PERSON_FOOD WHERE personid = ?", [person.id]) { food ->
                sql.firstRow("SELECT * FROM FOOD WHERE id = ?", [food.foodid])
            }
        }
    }

    /**
     * We here use a wrapper for counting java.sql.Connection.prepareStatement(java.lang.String)
     * calls.
     * When caching is on, same request must not cause a new prepareStatement call :
     * prepareStatementCallCounter must not be increased.
     *
     * When caching is off, same request causes a new prepareStatement call :
     * prepareStatementCallCounter must be increased.
     *
     */
    void testManuallyControlledCaching() {
        sql.cacheStatements = true
        sql.firstRow("SELECT * FROM PERSON WHERE lastname NOT like ? ", ['%a%'])
        assert prepareStatementCallCounter == 1
        sql.firstRow("SELECT * FROM PERSON WHERE lastname NOT like ? ", ['%a%'])
        assert prepareStatementCallCounter == 1
        sql.firstRow("SELECT * FROM FOOD WHERE id = ?", [3])
        assert prepareStatementCallCounter == 2
        sql.firstRow("SELECT * FROM PERSON WHERE lastname NOT like ? ", ['%a%'])
        assert prepareStatementCallCounter == 2

        // Stop caching
        sql.cacheStatements = false
        sql.firstRow("SELECT * FROM PERSON WHERE lastname NOT like ? ", ['%a%'])
        assert prepareStatementCallCounter == 3
        sql.firstRow("SELECT * FROM PERSON WHERE lastname NOT like ? ", ['%a%'])
        assert prepareStatementCallCounter == 4

        // Statements
        sql.cacheStatements = true
        createStatementCallCounter = 0
        sql.firstRow("SELECT * FROM PERSON")
        assert createStatementCallCounter == 1
        sql.firstRow("SELECT * FROM PERSON")
        assert createStatementCallCounter == 1
    }

    /**
     * @see #testManuallyControlledCaching()
     */
    void testNoCaching() {
        // preparedStatements
        sql.firstRow("SELECT * FROM PERSON WHERE lastname NOT like ? ", ['%a%'])
        assert prepareStatementCallCounter == 1
        sql.firstRow("SELECT * FROM PERSON WHERE lastname NOT like ? ", ['%a%'])
        assert prepareStatementCallCounter == 2

        // Statements
        createStatementCallCounter = 0
        sql.firstRow("SELECT * FROM PERSON")
        assert createStatementCallCounter == 1
        sql.firstRow("SELECT * FROM PERSON")
        assert createStatementCallCounter == 2
    }

    /**
     * When caching is on, data source connection must be kept and not released.
     * Use a wrapped delegate for counting javax.sql.DataSource.getConnection() calls.
     * When caching is off, javax.sql.DataSource.getConnection() must be called each time.
     */
    void testManuallyControlledCachingWithDataSource() {
        def connectionCallNumber = 0
        def methodOverride = [getConnection:{connectionCallNumber++; ds.getConnection()}]
        DataSource wrappedDs = ProxyGenerator.INSTANCE.instantiateDelegate(methodOverride, [DataSource], ds)
        sql = new Sql(wrappedDs)
        sql.cacheStatements = true
        sql.firstRow("SELECT * FROM PERSON WHERE lastname NOT like ? ", ['%a%'])
        assert connectionCallNumber == 1
        sql.firstRow("SELECT * FROM PERSON WHERE lastname NOT like ? ", ['%a%'])
        assert connectionCallNumber == 1
        sql.firstRow("SELECT * FROM FOOD WHERE id = ?", [3])
        assert connectionCallNumber == 1
        sql.firstRow("SELECT * FROM PERSON WHERE lastname NOT like ? ", ['%a%'])
        // Stop caching
        sql.cacheStatements = false
        sql.firstRow("SELECT * FROM PERSON WHERE lastname NOT like ? ", ['%a%'])
        assert connectionCallNumber == 2
        sql.firstRow("SELECT * FROM PERSON WHERE lastname NOT like ? ", ['%a%'])
        assert connectionCallNumber == 3
    }

    void testExceptionIsNotSwallowedCachingStatements() {
        checkExceptionIsNotSwallowedCachingStatements(new Exception('test.exception'))
    }

    void testSQLExceptionIsNotSwallowedCachingStatements() {
        checkExceptionIsNotSwallowedCachingStatements(new SQLException('test.exception'))
    }

    private checkExceptionIsNotSwallowedCachingStatements(Throwable t) {
        try {
            sql.cacheStatements {
                sql.eachRow("SELECT * FROM PERSON", []) {
                    throw t
                }
            }
            fail('Exception must be raised !')
        } catch (Exception e) {
            assert e.message == t.message
            assert !sql.cacheStatements
        }
    }

    void testExceptionIsNotSwallowedCachingConnection() {
        checkExceptionIsNotSwallowedCachingConnection(new Exception('test.exception'))
    }

    void testSQLExceptionIsNotSwallowedCachingConnection() {
        checkExceptionIsNotSwallowedCachingConnection(new SQLException('test.exception'))
    }

    private checkExceptionIsNotSwallowedCachingConnection(Throwable t) {
        try {
            sql.cacheConnection {
                sql.eachRow("SELECT * FROM PERSON", []) {
                    throw t
                }
            }
            fail('Exception must be raised !')
        } catch (Exception e) {
            assert e.message == t.message
            assert !sql.cacheStatements
        }
    }

}

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