org.javasimon.AbstractSimon Maven / Gradle / Ivy
package org.javasimon;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArrayList;
/**
* AbstractSimon implements basic enable/disable and hierarchy functionality.
* All Simon implementations extend this class.
*
* @author Richard "Virgo" Richter
*/
abstract class AbstractSimon implements Simon {
/** Owning manager of this Simon. */
protected Manager manager;
/** Simon's effective state. */
protected volatile boolean enabled;
/** Timestamp of the first usage. */
protected long firstUsage;
/** Timestamp of the last usage. */
protected long lastUsage;
private final String name;
private SimonState state = SimonState.INHERIT;
private Simon parent;
private final List children = new CopyOnWriteArrayList<>();
private String note;
private AttributesSupport attributesSupport = new AttributesSupport();
final Map incrementalSimons = new ConcurrentHashMap<>();
/**
* Constructor of the abstract Simon is used internally by subclasses.
*
* @param name Simon's name
* @param manager owning Manager
*/
AbstractSimon(String name, Manager manager) {
this.name = name;
this.manager = manager;
if (name == null || name.equals(Manager.ROOT_SIMON_NAME)) {
state = SimonState.ENABLED;
enabled = true;
}
}
@Override
public final Simon getParent() {
return parent;
}
@Override
public final List getChildren() {
return children;
}
/**
* Sets parent for this Simon - used only internally.
*
* @param parent Simon's parent
*/
final void setParent(Simon parent) {
this.parent = parent;
}
/**
* Adds child to this Simon with setting the parent of the child.
*
* @param simon future child of this Simon
*/
final void addChild(AbstractSimon simon) {
children.add(simon);
simon.setParent(this);
simon.enabled = enabled;
}
@Override
public final String getName() {
return name;
}
public final Manager getManager() {
return manager;
}
public synchronized final void setState(SimonState state, boolean overrule) {
if (state == null) {
throw new IllegalArgumentException();
}
// don't set inherit to anonymous (null) and root Simon!
if (!isAnonymousOrRootSimon() || !state.equals(SimonState.INHERIT)) {
this.state = state;
updateAndPropagateEffectiveState(shouldBeEffectivlyEnabled(), overrule);
}
}
private boolean isAnonymousOrRootSimon() {
return (name == null || name.equals(Manager.ROOT_SIMON_NAME));
}
private synchronized boolean shouldBeEffectivlyEnabled() {
if (state.equals(SimonState.INHERIT)) {
return parent.isEnabled();
}
return state.equals(SimonState.ENABLED);
}
private synchronized void updateAndPropagateEffectiveState(boolean enabled, boolean overrule) {
this.enabled = enabled;
for (Simon child : children) {
if (overrule) {
((AbstractSimon) child).state = SimonState.INHERIT;
}
if (child.getState().equals(SimonState.INHERIT)) {
((AbstractSimon) child).updateAndPropagateEffectiveState(enabled, overrule);
}
}
}
@Override
public boolean isEnabled() {
return enabled;
}
/**
* Updates usage statistics.
*
* @param now current millis timestamp
*/
void updateUsages(long now) {
lastUsage = now;
if (firstUsage == 0) {
firstUsage = lastUsage;
}
}
@Override
public synchronized final SimonState getState() {
return state;
}
@Override
public String getNote() {
return note;
}
@Override
public void setNote(String note) {
this.note = note;
}
@Override
public long getFirstUsage() {
return firstUsage;
}
@Override
public long getLastUsage() {
return lastUsage;
}
/**
* Replaces one of the children for a new one (unknown to concrete). Used only internally.
*
* @param simon original Simon (unknown)
* @param newSimon new Simon
*/
void replaceChild(Simon simon, AbstractSimon newSimon) {
children.remove(simon);
if (newSimon != null) {
children.add(newSimon);
newSimon.setParent(this);
}
}
/**
* Stores an attribute in this Simon. Attributes can be used to store any custom objects.
*
* @param name a String specifying the name of the attribute
* @param value the Object to be stored
* @since 2.3
*/
@Override
public void setAttribute(String name, Object value) {
attributesSupport.setAttribute(name, value);
}
/**
* Returns the value of the named attribute as an Object, or null if no attribute of
* the given name exists.
*
* @param name a String specifying the name of the attribute
* @return an Object containing the value of the attribute, or null if the attribute does not exist
* @since 2.3
*/
@Override
public Object getAttribute(String name) {
return attributesSupport.getAttribute(name);
}
/**
* Returns the value of the named attribute typed to the specified class, or {@code null} if no attribute of
* the given name exists.
*
* @param name a String specifying the name of the attribute
* @return the value of the attribute typed to T, or {@code null} if the attribute does not exist
* @since 3.4
*/
@Override
public T getAttribute(String name, Class clazz) {
return attributesSupport.getAttribute(name, clazz);
}
/**
* Removes an attribute from this Simon.
*
* @param name a String specifying the name of the attribute to remove
* @since 2.3
*/
@Override
public void removeAttribute(String name) {
attributesSupport.removeAttribute(name);
}
/**
* Returns an Iterator containing the names of the attributes available to this Simon.
* This method returns an empty Iterator if the Simon has no attributes available to it.
*
* @return an Iterator of strings containing the names of the Simon's attributes
* @since 2.3
*/
@Override
public Iterator getAttributeNames() {
return attributesSupport.getAttributeNames();
}
@Override
public Map getCopyAsSortedMap() {
return attributesSupport.getCopyAsSortedMap();
}
void sampleCommon(Sample sample) {
sample.setName(name);
sample.setNote(note);
sample.setFirstUsage(firstUsage);
sample.setLastUsage(lastUsage);
}
synchronized Sample sampleIncrementHelper(Object key, Simon newSimon) {
Simon simon = getAndResetSampleKey(key, newSimon);
if (simon != null) {
return simon.sample();
} else {
return sample();
}
}
@MustBeInSynchronized
private Simon getAndResetSampleKey(Object key, Simon newSimon) {
Simon simon = incrementalSimons.get(key);
incrementalSimons.put(key, newSimon);
return simon;
}
synchronized Sample sampleIncrementNoResetHelper(Object key) {
Simon simon = incrementalSimons.get(key);
if (simon != null) {
return simon.sample();
} else {
return sample();
}
}
@Override
public synchronized boolean stopIncrementalSampling(Object key) {
return incrementalSimons.remove(key) != null;
}
synchronized void purgeIncrementalSimonsOlderThan(long thresholdMs) {
Iterator> iterator = incrementalSimons.entrySet().iterator();
while (iterator.hasNext()) {
Map.Entry entry = iterator.next();
if (entry.getValue().getLastUsage() < thresholdMs) {
iterator.remove();
}
}
if (incrementalSimons.isEmpty()) {
incrementalSimons.clear();
}
}
/**
* Returns name and state of the Simon as a human readable string.
*
* @return name and state of the Simon
*/
@Override
public synchronized String toString() {
return " [" + name + " " + state +
(getNote() != null && getNote().length() != 0 ? " \"" + getNote() + "\"]" : "]");
}
}