/*

  * This software is licensed under the Apache License, Version 2.0

  * (the "License") agreement; 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 net.admin4j.entity;

 import java.util.ArrayList;

 import java.util.Collections;

 import java.util.HashMap;

 import java.util.List;

 import java.util.Map;

 import java.util.Map.Entry;

 import net.admin4j.deps.commons.beanutils.BeanComparator;

 import net.admin4j.deps.commons.collections.comparators.ReverseComparator;

 import net.admin4j.deps.commons.lang3.Validate;

 import net.admin4j.deps.commons.lang3.builder.ToStringBuilder;

 /**

  * Describes a Class/method/line that was executed at some point along with 

  * information about what it calls.

  * @author D. Ashmore

  *

  */

 public class ExecutionPoint implements Cloneable {

     /*

      * Note:  ANY field additions require an enhancement to method clone().

      */

     private StackTraceElement stackTraceElement;

     private Map<StackTraceElement, Long> calledStackTraceElementMap = new HashMap<StackTraceElement, Long>();

     private Map<StackTraceElement, Long> callingStackTraceElementMap = new HashMap<StackTraceElement, Long>();

     private Map<String, Long> blockingSynchronizedClassMap = new HashMap<String, Long>();

     private Object mapLock = new Object();

     private long nbrExecutions = 0;

     private long nbrBlockedExecutions = 0;

     private long createTimestampInMillis = System.currentTimeMillis();

     public ExecutionPoint(StackTraceElement stackTraceElement) {

         Validate.notNull(stackTraceElement, "Null stackTraceElement not allowed.");

         this.stackTraceElement = stackTraceElement;

     }

     public long getNbrExecutions() {

         return nbrExecutions;

     }

     public void setNbrExecutions(long nbrExecutions) {

         this.nbrExecutions = nbrExecutions;

     }

     public StackTraceElement getStackTraceElement() {

         return stackTraceElement;

     }

     @SuppressWarnings("unchecked")

     public List<Entry<StackTraceElement, Long>> getCalledStackTraceElementList() {

         List<Entry<StackTraceElement, Long>> list = new ArrayList<Entry<StackTraceElement, Long>>();

         synchronized(mapLock) {

             list.addAll(calledStackTraceElementMap.entrySet());

         }

         Collections.sort(list, new ReverseComparator(new BeanComparator("value")));

         return list;

     }

     /* (non-Javadoc)

      * @see java.lang.Object#hashCode()

      */

     @Override

     public int hashCode() {

         return this.stackTraceElement.hashCode();

     }

     /* (non-Javadoc)

      * @see java.lang.Object#equals(java.lang.Object)

      */

     @Override

     public boolean equals(Object obj) {

         if (obj == null)  return false;

         if ( !(obj instanceof ExecutionPoint) ) {

             return false;

         }

         ExecutionPoint ep = (ExecutionPoint)obj;

         return ep.stackTraceElement.equals(this.stackTraceElement);

     }

     public long getCreateTimestampInMillis() {

         return createTimestampInMillis;

     }

     public void setCreateTimestampInMillis(long createTimestampInMillis) {

         this.createTimestampInMillis = createTimestampInMillis;

     }

     /* (non-Javadoc)

      * @see java.lang.Object#clone()

      */

     @Override

     public Object clone() throws CloneNotSupportedException {

         ExecutionPoint newPoint = new ExecutionPoint(this.stackTraceElement);

         newPoint.nbrExecutions = this.nbrExecutions;

         newPoint.nbrBlockedExecutions = this.nbrBlockedExecutions;

         newPoint.createTimestampInMillis = this.createTimestampInMillis;

         synchronized (mapLock) {

             newPoint.calledStackTraceElementMap.putAll(this.calledStackTraceElementMap); 

             newPoint.callingStackTraceElementMap.putAll(this.callingStackTraceElementMap);

             newPoint.blockingSynchronizedClassMap.putAll(this.blockingSynchronizedClassMap);

         }

         return newPoint;

     }

     /* (non-Javadoc)

      * @see java.lang.Object#toString()

      */

     @Override

     public String toString() {

         synchronized (mapLock) {

             return new ToStringBuilder(this).

             append("stackTraceElement", stackTraceElement).

             append("nbrExecutions", nbrExecutions).

             append("createTimestampInMillis", createTimestampInMillis).

             append("calledStackTraceElementMap", calledStackTraceElementMap).

             append("callingStackTraceElementMap", callingStackTraceElementMap).

             append("blockingSynchronizedClassMap", blockingSynchronizedClassMap).

             toString();

         }

     }

     @SuppressWarnings("unchecked")

     public List<Entry<StackTraceElement, Long>> getCallingStackTraceElementList() {

         List<Entry<StackTraceElement, Long>> list = new ArrayList<Entry<StackTraceElement, Long>>();

         synchronized(mapLock) {

             list.addAll(callingStackTraceElementMap.entrySet());

         }

         Collections.sort(list, new ReverseComparator(new BeanComparator("value")));

         return list;

     }

     @SuppressWarnings("unchecked")

     public List<Entry<String, Long>> getBlockingSynchronizedClassList() {

         List<Entry<String, Long>> list = new ArrayList<Entry<String, Long>>();

         synchronized(mapLock) {

             list.addAll(blockingSynchronizedClassMap.entrySet());

         }

         Collections.sort(list, new ReverseComparator(new BeanComparator("value")));

         return list;

     }

     public long getNbrBlockedExecutions() {

         return nbrBlockedExecutions;

     }

     public void setNbrBlockedExecutions(long nbrBlockedExecutions) {

         this.nbrBlockedExecutions = nbrBlockedExecutions;

     }

     public void addCallingStackTraceElement(StackTraceElement element) {

         Validate.notNull(element, "Null element not allowed.");

         synchronized(mapLock) {

             Long nbrExecutions = callingStackTraceElementMap.get(element);

             if (nbrExecutions == null) {

                 callingStackTraceElementMap.put(element, Long.valueOf(1));

             }

             else callingStackTraceElementMap.put(element, Long.valueOf(nbrExecutions + 1));

         }

     }

     public void addCalledStackTraceElement(StackTraceElement element) {

         Validate.notNull(element, "Null element not allowed.");

         synchronized(mapLock) {

             Long nbrExecutions = calledStackTraceElementMap.get(element);

             if (nbrExecutions == null) {

                 calledStackTraceElementMap.put(element, Long.valueOf(1));

             }

             else calledStackTraceElementMap.put(element, Long.valueOf(nbrExecutions + 1));

         }

     }

     public void addBlockingSynchronizedClassName(String className) {

         Validate.notEmpty(className, "Null or blank className not allowed.");

         String localClassName = className;

         int atOffset = localClassName.indexOf("@");

         if (atOffset > 0) {

             localClassName = localClassName.substring(0, atOffset);

         }

         synchronized(mapLock) {

             Long nbrBlocks = blockingSynchronizedClassMap.get(localClassName);

             if (nbrBlocks == null) {

                 blockingSynchronizedClassMap.put(localClassName, Long.valueOf(1));

             }

             else blockingSynchronizedClassMap.put(localClassName, Long.valueOf(nbrBlocks + 1));

         }

     }

 }