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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); 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 com.frameworkset.commons.dbcp2;

import com.frameworkset.commons.pool2.TrackedUse;

import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

/**
 * Tracks db connection usage for recovering and reporting abandoned db connections.
 * 

* The JDBC Connection, Statement, and ResultSet classes extend this class. *

* * @since 2.0 */ public class AbandonedTrace implements TrackedUse { /** A list of objects created by children of this object. */ private final List> traceList = new ArrayList>(); /** Last time this connection was used. */ private volatile long lastUsedMillis = 0; /** * Creates a new AbandonedTrace without config and without doing abandoned tracing. */ public AbandonedTrace() { init(null); } /** * Constructs a new AbandonedTrace with a parent object. * * @param parent * AbandonedTrace parent object. */ public AbandonedTrace(final AbandonedTrace parent) { init(parent); } /** * Initializes abandoned tracing for this object. * * @param parent * AbandonedTrace parent object. */ private void init(final AbandonedTrace parent) { if (parent != null) { parent.addTrace(this); } } /** * Gets the last time this object was used in milliseconds. * * @return long time in milliseconds. */ @Override public long getLastUsed() { return lastUsedMillis; } /** * Sets the time this object was last used to the current time in milliseconds. */ protected void setLastUsed() { lastUsedMillis = System.currentTimeMillis(); } /** * Sets the time in milliseconds this object was last used. * * @param lastUsedMillis * time in milliseconds. */ protected void setLastUsed(final long lastUsedMillis) { this.lastUsedMillis = lastUsedMillis; } /** * Adds an object to the list of objects being traced. * * @param trace * AbandonedTrace object to add. */ protected void addTrace(final AbandonedTrace trace) { synchronized (this.traceList) { this.traceList.add(new WeakReference(trace)); } setLastUsed(); } /** * Clears the list of objects being traced by this object. */ protected void clearTrace() { synchronized (this.traceList) { this.traceList.clear(); } } /** * Gets a list of objects being traced by this object. * * @return List of objects. */ protected List getTrace() { final int size = traceList.size(); if (size == 0) { return Collections.emptyList(); } final ArrayList result = new ArrayList(size); synchronized (this.traceList) { final Iterator> iter = traceList.iterator(); while (iter.hasNext()) { final AbandonedTrace trace = iter.next().get(); if (trace == null) { // Clean-up since we are here anyway iter.remove(); } else { result.add(trace); } } } return result; } /** * Removes a child object this object is tracing. * * @param trace * AbandonedTrace object to remove. */ protected void removeTrace(final AbandonedTrace trace) { synchronized (this.traceList) { final Iterator> iter = traceList.iterator(); while (iter.hasNext()) { final AbandonedTrace traceInList = iter.next().get(); if (trace != null && trace.equals(traceInList)) { iter.remove(); break; } else if (traceInList == null) { // Clean-up since we are here anyway iter.remove(); } } } } /** * Removes this object the source object is tracing. * * @param source The object tracing * @since 2.7.0 */ protected void removeThisTrace(final Object source) { if (source instanceof AbandonedTrace) { AbandonedTrace.class.cast(source).removeTrace(this); } } }




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