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From Craig Johannsen <cr...@ludicorp.com>
Subject Re: Simple Example of Accessing JCS Cache
Date Wed, 10 Sep 2003 19:19:33 GMT
/*
* JCSTest.java
*
* Created on Sept 10, 2003, 12:21 PM
*
* $Log$
*/

//==============================================================================
// Imports for JCS.
//==============================================================================
import org.apache.jcs.JCS;
import org.apache.jcs.access.exception.*;
//==============================================================================
// Imports for java collections.
//==============================================================================
import java.util.*;

/**
* Tests JCS object cache functionality. Uses "cache.ccf" configuration file.
* Not a very realistic example, but shows how to put into and get from a 
cache.
* Also illustrates some properties of the key class, such as what 
functions it
* should implement.
*
* @author Craig Johannsen
*/
public class JCSTest {
/** Primary keys for Dog instances. */
private static final String DOG_ID_01 = "Goldie";
private static final String DOG_ID_02 = "Bowser";
/** Primary keys for Cat instances. */
private static final String CAT_ID_01 = "Fluffy";
private static final String CAT_ID_02 = "Blackie";
private static JCS dfltCache;
private static JCS dogCache;
private static JCS catCache;
private static Hashtable hashTable = new Hashtable();

private class Key {
public String keyValue;
public Key(String val) { keyValue = val; }
public String getKeyValue() { return keyValue; }
public boolean equals(Object obj) {
System.out.println(">>>called equals");
if (obj instanceof Key)
return keyValue.equals(((Key) obj).getKeyValue());
else if (obj instanceof String)
return keyValue.equals(obj);
else
return false;
}
public int hashCode() {
System.out.println(">>>called hashCode");
return keyValue.hashCode();
}
public String toString() { return keyValue; }
}

/** Note that cached items must be Serializable. */
private interface AnimalIF extends java.io.Serializable {
void speak();
String getName();
String toString();
boolean equals(AnimalIF animal);
}

private class Dog implements AnimalIF {
private String name;
public Dog(String name) { this.name = name; }
public String getName() { return name; }
public String toString() { return "A dog named " + name; }
public void speak() { System.out.println(name + " says 'Woof'"); }
public boolean equals(AnimalIF animal) { return 
name.equals(animal.getName()); }
}

private class Cat implements AnimalIF {
private String name;
public Cat(String name) { this.name = name; }
public String getName() { return name; }
public String toString() { return "A cat named " + name; }
public void speak() { System.out.println(name + " says 'Meow'"); }
public boolean equals(AnimalIF animal) { return 
name.equals(animal.getName()); }
}

/** Creates a new instance of TestJCS */
public JCSTest() {
try {
dfltCache = JCS.getInstance("dflt");
String dogCacheName = getCacheName(Dog.class);
System.out.println("dogCache=" + dogCacheName);
dogCache = JCS.getInstance(dogCacheName);
String catCacheName = getCacheName(Cat.class);
System.out.println("catCache=" + catCacheName);
catCache = JCS.getInstance(catCacheName);
} catch (CacheException e) {
System.out.println("Error instantiating cache: " + e);
System.exit(100);
}
}

public String getCacheName(Class objClass) {
return objClass.getName();
}

public void doTest() {
// Testing some hypotheses about Hashtable key comparisons.
System.out.println(">>>Starting Hashtable Key test");
Key key1 = new Key("key1");
hashTable.put(key1, "key one");
Key key2 = new Key("key2");
hashTable.put(key2, "key two");
String val1 = (String) hashTable.get(key1);
System.out.println("key1 value=" + val1);
String val2 = (String) hashTable.get(key2);
System.out.println("key2 value=" + val2);

// Testing some hypotheses about JCS key comparisons.
System.out.println(">>>Starting JCS Key test");
try {
dfltCache.put(key1.toString(), "key one");
dfltCache.put(key2.toString(), "key two");
val1 = (String) hashTable.get(key1.toString());
System.out.println("key1 value=" + val1);
val2 = (String) hashTable.get(key2.toString());
System.out.println("key2 value=" + val2);
} catch (Exception e) {
System.out.println("Exception during KeyTest: " + e);
e.printStackTrace();
};
System.out.println(">>>End of Key tests");

// Create some Dog instances
Dog dog1 = new Dog(DOG_ID_01);
Dog dog2 = new Dog(DOG_ID_02);
System.out.println("dog1=" + dog1);
System.out.println("dog2=" + dog2);

// Create some Cat instances
AnimalIF cat1 = new Cat(CAT_ID_01);
AnimalIF cat2 = new Cat(CAT_ID_02);
System.out.println("cat1=" + cat1);
System.out.println("cat2=" + cat2);

// Add each Dog and Cat instance to the dogCache or catCache.
try {
dogCache.put(dog1.getName(), dog1);
dogCache.put(dog2.getName(), dog2);
catCache.put(cat1.getName(), cat1);
catCache.put(cat2.getName(), cat2);
} catch (CacheException e) {
System.out.println("Error putting animal object into cache: " + e);
System.exit(100);
}

// Ensure that we get the correct reg objects from the reg cache.
Dog dog1a = (Dog)dogCache.get(DOG_ID_01);
System.out.println("get dog1a=" + dog1a);
if (dog1a == null)
System.out.println(">>>ERROR: dog1a is null");
else if (! dog1a.equals(dog1))
System.out.println(">>>ERROR: dog1a does not match dog1");
else {
System.out.println("dog1a is OK, obj=" + dog1a);
dog1a.speak();
}

Dog dog2a = (Dog)dogCache.get(DOG_ID_02);
System.out.println("get dog2a=" + dog2a);
if (dog2a == null)
System.out.println(">>>ERROR: dog2a is null");
else if (! dog2a.equals(dog2))
System.out.println(">>>ERROR: dog2a does not match dog2");
else {
System.out.println("dog2a is OK, obj=" + dog2a);
dog2a.speak();
}

Cat cat1a = (Cat)catCache.get(CAT_ID_01);
System.out.println("get cat1a=" + cat1a);
if (cat1a == null)
System.out.println(">>>ERROR: cat1a is null");
else if (! cat1a.equals(cat1))
System.out.println(">>>ERROR: cat1a does not match cat1");
else {
System.out.println("cat1a is OK, obj=" + cat1a);
cat1a.speak();
}

Cat cat2a = (Cat)catCache.get(CAT_ID_02);
System.out.println("get cat2a=" + cat2a);
if (cat2a == null)
System.out.println(">>>ERROR: cat2a is null");
else if (! cat2a.equals(cat2))
System.out.println(">>>ERROR: cat2a does not match cat2");
else {
System.out.println("cat2a is OK, obj=" + cat2a);
cat2a.speak();
}

// Test removal from the cache.
try {
dogCache.remove(DOG_ID_02);
Dog dogX = (Dog) dogCache.get(DOG_ID_02);
if (dogX != null)
System.out.println(">>>ERROR: dogX is NOT null, obj=" + dogX);
else
System.out.println("dogX is OK (should be null), obj=" + dogX);
} catch (CacheException e) {
System.out.println(">>>Error removing dog2 from location cache: " + e);
System.exit(100);
}
}

/**
* The main program.
*/
public static void main(String[] args) {
try {
JCSTest test = new JCSTest();
test.doTest();
} catch(Exception e) {
System.out.println("Uncaught error: " + e);
e.printStackTrace(); }
System.exit(0);
}

}

====================================================================
File build.sh -- build script for Linux/Unix
CP=".:your_lib/jcs.jar:your_lib/commons-lang.jar"
javac -classpath $CP JCSTest.java

====================================================================
File run.sh -- run script for Linux/Unix (remember to "chmod +x run.sh")
CP=".:/home/craigj/lib/jcs.jar:/home/craigj/lib/commons-lang.jar":/home/craigj/lib/commons-logging.jar
java -classpath $CP JCSTest

====================================================================
File cache.ccf -- JCS configuration file
# DEFAULT CACHE REGION
jcs.default=DC
jcs.default.cacheattributes=org.apache.jcs.engine.CompositeCacheAttributes
jcs.default.cacheattributes.MaxObjects=2000
jcs.default.cacheattributes.MemoryCacheName=org.apache.jcs.engine.memory.lru.LRUMemoryCache
jcs.default.elementattributes=org.apache.jcs.engine.ElementAttributes
jcs.default.elementattributes.IsEternal=false
jcs.default.elementattributes.MaxLifeSeconds=2400
jcs.default.elementattributes.IdleTime=1800
jcs.default.elementattributes.IsSpool=false
jcs.default.elementattributes.IsRemote=false
jcs.default.elementattributes.IsLateral=false

#Dog Cache
jcs.region.JCSTest$Dog=
jcs.region.JCSTest$Dog.cacheattributes=org.apache.jcs.engine.CompositeCacheAttributes
jcs.region.JCSTest$Dog.cacheattributes.MaxObjects=4000
jcs.region.JCSTest$Dog.cacheattributes.MemoryCacheName=org.apache.jcs.engine.memory.lru.LRUMemoryCache
jcs.region.JCSTest$Dog.cacheattributes.UseMemoryShrinker=true
jcs.region.JCSTest$Dog.cacheattributes.MaxMemoryIdleTimeSeconds=3600
jcs.region.JCSTest$Dog.cacheattributes.ShrinkerIntervalSeconds=600
jcs.region.JCSTest$Dog.elementattributes=org.apache.jcs.engine.ElementAttributes
jcs.region.JCSTest$Dog.elementattributes.IsEternal=false
jcs.region.JCSTest$Dog.elementattributes.MaxLifeSeconds=2400
jcs.region.JCSTest$Dog.elementattributes.IdleTime=180
jcs.region.JCSTest$Dog.elementattributes.IsSpool=false
jcs.region.JCSTest$Dog.elementattributes.IsRemote=false
jcs.region.JCSTest$Dog.elementattributes.IsLateral=false

#Cat Cache
jcs.region.JCSTest$Cat=
jcs.region.JCSTest$Cat.cacheattributes=org.apache.jcs.engine.CompositeCacheAttributes
jcs.region.JCSTest$Cat.cacheattributes.MaxObjects=4000
jcs.region.JCSTest$Cat.cacheattributes.MemoryCacheName=org.apache.jcs.engine.memory.lru.LRUMemoryCache
jcs.region.JCSTest$Cat.cacheattributes.UseMemoryShrinker=true
jcs.region.JCSTest$Cat.cacheattributes.MaxMemoryIdleTimeSeconds=3600
jcs.region.JCSTest$Cat.cacheattributes.ShrinkerIntervalSeconds=600
jcs.region.JCSTest$Cat.elementattributes=org.apache.jcs.engine.ElementAttributes
jcs.region.JCSTest$Cat.elementattributes.IsEternal=false
jcs.region.JCSTest$Cat.elementattributes.MaxLifeSeconds=2400
jcs.region.JCSTest$Cat.elementattributes.IdleTime=180
jcs.region.JCSTest$Cat.elementattributes.IsSpool=false
jcs.region.JCSTest$Cat.elementattributes.IsRemote=false
jcs.region.JCSTest$Cat.elementattributes.IsLateral=false



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