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JdbcMapper
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Cache options for CachingResultSetMapper too, added StaticCachingResultSetMapper and StaticCompilingResultSetMapper

This commit is contained in:
Travis Burtrum 2017-05-17 14:01:08 -04:00
parent ccbbb3929e
commit c9e8037963
4 changed files with 177 additions and 4 deletions
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122
beehive-jdbc-mapper/src/main/java/com/moparisthebest/jdbc/CachingResultSetMapper.java
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@ -3,18 +3,132 @@ package com.moparisthebest.jdbc;
import java.sql.ResultSet;
import java.util.Calendar;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* Maps the same as ResultSetMapper except caches constructor and field mappings
*
* @see ResultSetMapper
*/
public class CachingResultSetMapper extends ResultSetMapper {
protected final Map<CachingRowToObjectMapper.ResultSetKey, CachingRowToObjectMapper.FieldMapping<?>> cache = new HashMap<CachingRowToObjectMapper.ResultSetKey, CachingRowToObjectMapper.FieldMapping<?>>();
public CachingResultSetMapper(Calendar cal, int arrayMaxLength) {
protected final Map<CachingRowToObjectMapper.ResultSetKey, CachingRowToObjectMapper.FieldMapping<?>> cache;
/**
* CachingResultSetMapper with optional maxEntries, expiring old ones in LRU fashion
*
* @param cal optional calendar for date/time values
* @param arrayMaxLength max array/list/map length, a value of less than 1 indicates that all rows from the ResultSet should be included
* @param maxEntries max cached compiled entries to keep in cache, < 1 means unlimited
*/
public CachingResultSetMapper(final Calendar cal, final int arrayMaxLength, final int maxEntries) {
super(cal, arrayMaxLength);
if (maxEntries > 0) { // we want a limited cache
final float loadFactor = 0.75f; // default for HashMaps
// if we set the initialCapacity this way, nothing should ever need re-sized
final int initialCapacity = ((int) Math.ceil(maxEntries / loadFactor)) + 1;
cache = new LinkedHashMap<CachingRowToObjectMapper.ResultSetKey, CachingRowToObjectMapper.FieldMapping<?>>(initialCapacity, loadFactor, true) {
@Override
protected boolean removeEldestEntry(final Map.Entry<CachingRowToObjectMapper.ResultSetKey, CachingRowToObjectMapper.FieldMapping<?>> eldest) {
return size() > maxEntries;
}
};
} else
cache = new HashMap<CachingRowToObjectMapper.ResultSetKey, CachingRowToObjectMapper.FieldMapping<?>>();
}
/**
* CachingResultSetMapper with unlimited cache
*
* @param cal optional calendar for date/time values
* @param arrayMaxLength max array/list/map length, a value of less than 1 indicates that all rows from the ResultSet should be included
*/
public CachingResultSetMapper(final Calendar cal, final int arrayMaxLength) {
this(cal, arrayMaxLength, 0); // default unlimited cache
}
/**
* CachingResultSetMapper with unlimited cache
*
* @param arrayMaxLength max array/list/map length, a value of less than 1 indicates that all rows from the ResultSet should be included
*/
public CachingResultSetMapper(final int arrayMaxLength) {
this(null, arrayMaxLength);
}
/**
* CachingResultSetMapper with unlimited cache
*/
public CachingResultSetMapper() {
super();
this(-1);
}
/**
* CachingResultSetMapper with custom cache implementation
*
* @param cal optional calendar for date/time values
* @param arrayMaxLength max array/list/map length, a value of less than 1 indicates that all rows from the ResultSet should be included
* @param cache any Map implementation for cache you wish, does not need to handle null keys or values
*/
public CachingResultSetMapper(final Calendar cal, final int arrayMaxLength, final Map<CachingRowToObjectMapper.ResultSetKey, CachingRowToObjectMapper.FieldMapping<?>> cache) {
super(cal, arrayMaxLength);
if (cache == null)
throw new IllegalArgumentException("cache cannot be null");
this.cache = cache;
}
/**
* CachingResultSetMapper with custom cache implementation
*
* @param arrayMaxLength max array/list/map length, a value of less than 1 indicates that all rows from the ResultSet should be included
* @param cache any Map implementation for cache you wish, does not need to handle null keys or values
*/
public CachingResultSetMapper(final int arrayMaxLength, final Map<CachingRowToObjectMapper.ResultSetKey, CachingRowToObjectMapper.FieldMapping<?>> cache) {
this(null, arrayMaxLength, cache);
}
/**
* CachingResultSetMapper with custom cache implementation
*
* @param cache any Map implementation for cache you wish, does not need to handle null keys or values
*/
public CachingResultSetMapper(final Map<CachingRowToObjectMapper.ResultSetKey, CachingRowToObjectMapper.FieldMapping<?>> cache) {
this(-1, cache);
}
/**
* CachingResultSetMapper with optionally threadSafe cache implementation
*
* @param cal optional calendar for date/time values
* @param arrayMaxLength max array/list/map length, a value of less than 1 indicates that all rows from the ResultSet should be included
* @param threadSafe true uses a thread-safe cache implementation (currently ConcurrentHashMap), false uses regular HashMap
*/
public CachingResultSetMapper(final Calendar cal, final int arrayMaxLength, final boolean threadSafe) {
this(cal, arrayMaxLength, threadSafe ?
new ConcurrentHashMap<CachingRowToObjectMapper.ResultSetKey, CachingRowToObjectMapper.FieldMapping<?>>()
:
new HashMap<CachingRowToObjectMapper.ResultSetKey, CachingRowToObjectMapper.FieldMapping<?>>()
);
}
/**
* CachingResultSetMapper with optionally threadSafe cache implementation
*
* @param arrayMaxLength max array/list/map length, a value of less than 1 indicates that all rows from the ResultSet should be included
* @param threadSafe true uses a thread-safe cache implementation (currently ConcurrentHashMap), false uses regular HashMap
*/
public CachingResultSetMapper(final int arrayMaxLength, final boolean threadSafe) {
this(null, arrayMaxLength, threadSafe);
}
/**
* CachingResultSetMapper with optionally threadSafe cache implementation
*
* @param threadSafe true uses a thread-safe cache implementation (currently ConcurrentHashMap), false uses regular HashMap
*/
public CachingResultSetMapper(final boolean threadSafe) {
this(-1, threadSafe);
}
@Override

3
beehive-jdbc-mapper/src/main/java/com/moparisthebest/jdbc/CachingRowToObjectMapper.java
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@ -8,6 +8,9 @@ import java.util.Arrays;
import java.util.Calendar;
import java.util.Map;
/**
* Maps same as RowToObjectMapper except caches constructor and field mappings
*/
public class CachingRowToObjectMapper<T> extends RowToObjectMapper<T> {
protected final Map<ResultSetKey, FieldMapping<T>> cache;

28
beehive-jdbc-mapper/src/main/java/com/moparisthebest/jdbc/StaticCachingResultSetMapper.java Normal file
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@ -0,0 +1,28 @@
package com.moparisthebest.jdbc;
import java.util.Calendar;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* Global for entire application, hopefully you know what you are doing.
*/
public class StaticCachingResultSetMapper extends CachingResultSetMapper {
private static final Map<CachingRowToObjectMapper.ResultSetKey, CachingRowToObjectMapper.FieldMapping<?>> cache = new ConcurrentHashMap<CachingRowToObjectMapper.ResultSetKey, CachingRowToObjectMapper.FieldMapping<?>>();
public static final StaticCachingResultSetMapper instance = new StaticCachingResultSetMapper();
public StaticCachingResultSetMapper(final Calendar cal, final int arrayMaxLength) {
super(cal, arrayMaxLength, cache);
}
public StaticCachingResultSetMapper(final int arrayMaxLength) {
super(arrayMaxLength, cache);
}
public StaticCachingResultSetMapper() {
super(cache);
}
}

28
beehive-jdbc-mapper/src/main/java/com/moparisthebest/jdbc/StaticCompilingResultSetMapper.java Normal file
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@ -0,0 +1,28 @@
package com.moparisthebest.jdbc;
import java.util.Calendar;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* Global for entire application, hopefully you know what you are doing.
*/
public class StaticCompilingResultSetMapper extends CompilingResultSetMapper {
private static final Map<CachingRowToObjectMapper.ResultSetKey, CompilingRowToObjectMapper.ResultSetToObject<?>> cache = new ConcurrentHashMap<CachingRowToObjectMapper.ResultSetKey, CompilingRowToObjectMapper.ResultSetToObject<?>>();
public static final StaticCompilingResultSetMapper instance = new StaticCompilingResultSetMapper();
public StaticCompilingResultSetMapper(final Calendar cal, final int arrayMaxLength) {
super(cal, arrayMaxLength, cache);
}
public StaticCompilingResultSetMapper(final int arrayMaxLength) {
super(arrayMaxLength, cache);
}
public StaticCompilingResultSetMapper() {
super(cache);
}
}