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一些代码 #2

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47 changes: 47 additions & 0 deletions JavaConcurrencyInPractice.iml
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<?xml version="1.0" encoding="UTF-8"?>
<module type="JAVA_MODULE" version="4">
<component name="EclipseModuleManager">
<libelement value="jar://$MODULE_DIR$/lib/jcip-annotations.jar!/" />
<libelement value="jar://$MODULE_DIR$/lib/javax.servlet-3.0.jar!/" />
<libelement value="jar://$MODULE_DIR$/lib/Keygen.jar!/" />
<src_description expected_position="1">
<src_folder value="file://$MODULE_DIR$/src" expected_position="1" />
</src_description>
</component>
<component name="NewModuleRootManager" inherit-compiler-output="false">
<output url="file://$MODULE_DIR$/bin" />
<exclude-output />
<content url="file://$MODULE_DIR$">
<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
</content>
<orderEntry type="jdk" jdkName="JavaSE-1.8" jdkType="JavaSDK" />
<orderEntry type="sourceFolder" forTests="false" />
<orderEntry type="module-library">
<library name="jcip-annotations.jar">
<CLASSES>
<root url="jar://$MODULE_DIR$/lib/jcip-annotations.jar!/" />
</CLASSES>
<JAVADOC />
<SOURCES />
</library>
</orderEntry>
<orderEntry type="module-library">
<library name="javax.servlet-3.0.jar">
<CLASSES>
<root url="jar://$MODULE_DIR$/lib/javax.servlet-3.0.jar!/" />
</CLASSES>
<JAVADOC />
<SOURCES />
</library>
</orderEntry>
<orderEntry type="module-library">
<library name="Keygen.jar">
<CLASSES>
<root url="jar://$MODULE_DIR$/lib/Keygen.jar!/" />
</CLASSES>
<JAVADOC />
<SOURCES />
</library>
</orderEntry>
</component>
</module>
22 changes: 22 additions & 0 deletions src/Chapter4/Counter.java
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package Chapter4;

import net.jcip.annotations.GuardedBy;
import net.jcip.annotations.ThreadSafe;

@ThreadSafe
public final class Counter {
@GuardedBy("this") private long value = 0;

public synchronized long getValue() {
return value;
}

public synchronized long increment() {
if(value == Long.MAX_VALUE) {
throw new IllegalStateException("counter overflow");
}
return ++value;
}


}
37 changes: 37 additions & 0 deletions src/Chapter4/MonitorVehicleTracker.java
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package Chapter4;

import java.util.Collections;
import java.util.Map;

import net.jcip.annotations.GuardedBy;
import net.jcip.annotations.NotThreadSafe;
import net.jcip.annotations.ThreadSafe;

@ThreadSafe
public class MonitorVehicleTracker {
@GuardedBy("this")
private final Map<String,MutablePoint> locations;

public MonitorVehicleTracker(Map<String,MutablePoint> locations) {
this.locations = deepCopy(locations);
}

private static Map<String,MutablePoint> deepCopy(Map<String,MutablePoint> locations){
return Collections.unmodifiableMap(locations);
}
}

@NotThreadSafe
class MutablePoint{
public int x,y;

public MutablePoint() {
x = 0;
y = 0;
}

public MutablePoint(MutablePoint p) {
this.x = p.x;
this.y = p.y;
}
}
22 changes: 22 additions & 0 deletions src/Chapter4/PersonSet.java
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package Chapter4;

import java.util.HashSet;
import java.util.Set;

import net.jcip.annotations.GuardedBy;
import net.jcip.annotations.ThreadSafe;

@ThreadSafe
public class PersonSet {
@GuardedBy("this")
private final Set<Person> myset = new HashSet<Person>();

public synchronized void addPerson(Person p) {
myset.add(p);
}
public synchronized boolean containsPerson(Person p) {
return myset.contains(p);
}

}
class Person {}
23 changes: 23 additions & 0 deletions src/Chapter4/PrivateLock.java
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package Chapter4;

import net.jcip.annotations.GuardedBy;

/**
* ͨ��һ��˽����������״̬
* @author dell
*
*/
public class PrivateLock {
private final Object myLock = new Object();

@GuardedBy("myLock")
Widget widget;

void someMethod() {
synchronized(myLock) {
//�޸Ļ����widget��״̬
}
}
}

class Widget{}