[logback-dev] [GIT] Logback: the generic, reliable, fast and flexible logging framework. branch, master, updated. v_0.9.29-32-g7a2e02b
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- Log -----------------------------------------------------------------
http://git.qos.ch/gitweb/?p=logback.git;a=commit;h=7a2e02bca24d872d580694ab89a865542103e570
http://github.com/ceki/logback/commit/7a2e02bca24d872d580694ab89a865542103e570
commit 7a2e02bca24d872d580694ab89a865542103e570
Author: Ceki Gulcu <ceki at qos.ch>
Date: Tue Sep 20 21:50:42 2011 +0200
fix http://jira.qos.ch/browse/LBCLASSIC-289
diff --git a/logback-classic/src/main/java/ch/qos/logback/classic/util/LogbackMDCAdapter.java b/logback-classic/src/main/java/ch/qos/logback/classic/util/LogbackMDCAdapter.java
index 4d494e9..b045016 100644
--- a/logback-classic/src/main/java/ch/qos/logback/classic/util/LogbackMDCAdapter.java
+++ b/logback-classic/src/main/java/ch/qos/logback/classic/util/LogbackMDCAdapter.java
@@ -15,8 +15,10 @@ package ch.qos.logback.classic.util;
import java.util.HashMap;
import java.util.Map;
+import java.util.Collections;
import java.util.Set;
+
import org.slf4j.spi.MDCAdapter;
/**
@@ -49,7 +51,7 @@ public final class LogbackMDCAdapter implements MDCAdapter {
// Initially the contents of the thread local in parent and child threads
// reference the same map. However, as soon as a thread invokes the put()
// method, the maps diverge as they should.
- final InheritableThreadLocal<HashMap<String, String>> copyOnInheritThreadLocal = new InheritableThreadLocal<HashMap<String, String>>();
+ final InheritableThreadLocal<Map<String, String>> copyOnInheritThreadLocal = new InheritableThreadLocal<Map<String, String>>();
private static final int WRITE_OPERATION = 1;
private static final int READ_OPERATION = 2;
@@ -70,11 +72,16 @@ public final class LogbackMDCAdapter implements MDCAdapter {
return lastOp == null || lastOp.intValue() == READ_OPERATION;
}
- private HashMap<String, String> duplicateAndInsertNewMap(HashMap<String, String> oldMap) {
- HashMap<String, String> newMap = new HashMap<String, String>();
- if (oldMap != null)
- newMap.putAll(oldMap);
- // the newMap replaces the old one for serialisation's sake
+ private Map<String, String> duplicateAndInsertNewMap(Map<String, String> oldMap) {
+ Map<String, String> newMap = Collections.synchronizedMap(new HashMap<String, String>());
+ if (oldMap != null) {
+ // we don't want the parent thread modifying oldMap while we are
+ // iterating over it
+ synchronized (oldMap) {
+ newMap.putAll(oldMap);
+ }
+ }
+
copyOnInheritThreadLocal.set(newMap);
return newMap;
}
@@ -95,11 +102,13 @@ public final class LogbackMDCAdapter implements MDCAdapter {
throw new IllegalArgumentException("key cannot be null");
}
- HashMap<String, String> oldMap = copyOnInheritThreadLocal.get();
+ Map<String, String> oldMap = copyOnInheritThreadLocal.get();
+ //System.out.println(Thread.currentThread().toString()+", "+oldMap);
+
Integer lastOp = getAndSetLastOperation(WRITE_OPERATION);
if (wasLastOpReadOrNull(lastOp) || oldMap == null) {
- HashMap<String, String> newMap = duplicateAndInsertNewMap(oldMap);
+ Map<String, String> newMap = duplicateAndInsertNewMap(oldMap);
newMap.put(key, val);
} else {
oldMap.put(key, val);
@@ -114,13 +123,13 @@ public final class LogbackMDCAdapter implements MDCAdapter {
if (key == null) {
return;
}
- HashMap<String, String> oldMap = copyOnInheritThreadLocal.get();
+ Map<String, String> oldMap = copyOnInheritThreadLocal.get();
if (oldMap == null) return;
Integer lastOp = getAndSetLastOperation(WRITE_OPERATION);
if (wasLastOpReadOrNull(lastOp)) {
- HashMap<String, String> newMap = duplicateAndInsertNewMap(oldMap);
+ Map<String, String> newMap = duplicateAndInsertNewMap(oldMap);
newMap.remove(key);
} else {
oldMap.remove(key);
@@ -177,10 +186,8 @@ public final class LogbackMDCAdapter implements MDCAdapter {
* null.
*/
public Map getCopyOfContextMap() {
- // why aren't we setting lastOperation as follows?
- // lastOperation.set(READ_OPERATION);
-
- HashMap<String, String> hashMap = copyOnInheritThreadLocal.get();
+ lastOperation.set(READ_OPERATION);
+ Map<String, String> hashMap = copyOnInheritThreadLocal.get();
if (hashMap == null) {
return null;
} else {
@@ -192,7 +199,7 @@ public final class LogbackMDCAdapter implements MDCAdapter {
public void setContextMap(Map contextMap) {
lastOperation.set(WRITE_OPERATION);
- HashMap<String, String> newMap = new HashMap<String, String>();
+ Map<String, String> newMap = Collections.synchronizedMap(new HashMap<String, String>());
newMap.putAll(contextMap);
// the newMap replaces the old one for serialisation's sake
diff --git a/logback-classic/src/test/java/ch/qos/logback/classic/spi/LoggingEventSerializationPerfTest.java b/logback-classic/src/test/java/ch/qos/logback/classic/spi/LoggingEventSerializationPerfTest.java
index f759df2..9703f58 100644
--- a/logback-classic/src/test/java/ch/qos/logback/classic/spi/LoggingEventSerializationPerfTest.java
+++ b/logback-classic/src/test/java/ch/qos/logback/classic/spi/LoggingEventSerializationPerfTest.java
@@ -22,6 +22,7 @@ import java.io.ObjectOutputStream;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
+import org.slf4j.MDC;
import org.slf4j.helpers.BogoPerf;
import ch.qos.logback.classic.net.NOPOutputStream;
@@ -53,6 +54,7 @@ public class LoggingEventSerializationPerfTest {
@Before
public void setUp() throws Exception {
+ MDC.clear();
oos = new ObjectOutputStream(noos);
}
diff --git a/logback-classic/src/test/java/ch/qos/logback/classic/util/LogbackMDCAdapterTest.java b/logback-classic/src/test/java/ch/qos/logback/classic/util/LogbackMDCAdapterTest.java
index c8251a1..dca0e26 100644
--- a/logback-classic/src/test/java/ch/qos/logback/classic/util/LogbackMDCAdapterTest.java
+++ b/logback-classic/src/test/java/ch/qos/logback/classic/util/LogbackMDCAdapterTest.java
@@ -20,11 +20,10 @@ import static org.junit.Assert.assertTrue;
import java.util.HashMap;
import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CountDownLatch;
import org.junit.Test;
-import org.slf4j.MDC;
-
import ch.qos.logback.core.testUtil.RandomUtil;
public class LogbackMDCAdapterTest {
@@ -34,6 +33,8 @@ public class LogbackMDCAdapterTest {
int diff = RandomUtil.getPositiveInt();
+ private final LogbackMDCAdapter mdcAdapter = new LogbackMDCAdapter();
+
/**
* Test that CopyOnInheritThreadLocal does not barf when the
@@ -43,12 +44,10 @@ public class LogbackMDCAdapterTest {
*/
@Test
public void lbclassic77Test() throws InterruptedException {
- LogbackMDCAdapter lma = new LogbackMDCAdapter();
-
- HashMap<String, String> parentHM = getHashMapFromMDCAdapter(lma);
+ Map<String, String> parentHM = getMapFromMDCAdapter(mdcAdapter);
assertNull(parentHM);
- ChildThreadForMDCAdapter childThread = new ChildThreadForMDCAdapter(lma);
+ ChildThreadForMDCAdapter childThread = new ChildThreadForMDCAdapter(mdcAdapter);
childThread.start();
childThread.join();
assertTrue(childThread.successul);
@@ -57,57 +56,34 @@ public class LogbackMDCAdapterTest {
@Test
public void removeForNullKeyTest() {
- LogbackMDCAdapter lma = new LogbackMDCAdapter();
- lma.remove(null);
+ mdcAdapter.remove(null);
}
@Test
public void removeInexistentKey() {
- LogbackMDCAdapter lma = new LogbackMDCAdapter();
- lma.remove("abcdlw0");
+ mdcAdapter.remove("abcdlw0");
}
@Test
public void sequenceWithGet() {
- LogbackMDCAdapter lma = new LogbackMDCAdapter();
- lma.put("k0", "v0");
- Map<String, String> map0 = lma.copyOnInheritThreadLocal.get();
- lma.get("k0"); // point 0
- lma.put("k0", "v1");
+ mdcAdapter.put("k0", "v0");
+ Map<String, String> map0 = mdcAdapter.copyOnInheritThreadLocal.get();
+ mdcAdapter.get("k0"); // point 0
+ mdcAdapter.put("k0", "v1");
// verify that map0 is that in point 0
assertEquals("v0", map0.get("k0"));
}
@Test
public void sequenceWithGetPropertyMap() {
- LogbackMDCAdapter lma = new LogbackMDCAdapter();
- lma.put("k0", "v0");
- Map<String, String> map0 = lma.getPropertyMap(); // point 0
- lma.put("k0", "v1");
+ mdcAdapter.put("k0", "v0");
+ Map<String, String> map0 = mdcAdapter.getPropertyMap(); // point 0
+ mdcAdapter.put("k0", "v1");
// verify that map0 is that in point 0
assertEquals("v0", map0.get("k0"));
}
-
- class ChildThreadForMDCAdapter extends Thread {
-
- LogbackMDCAdapter logbackMDCAdapter;
- boolean successul;
- HashMap<String, String> childHM;
-
- ChildThreadForMDCAdapter(LogbackMDCAdapter logbackMDCAdapter) {
- this.logbackMDCAdapter = logbackMDCAdapter;
- }
-
- @Override
- public void run() {
- childHM = getHashMapFromMDCAdapter(logbackMDCAdapter);
- logbackMDCAdapter.get("");
- successul = true;
- }
- }
-
// =================================================
/**
@@ -121,18 +97,18 @@ public class LogbackMDCAdapterTest {
CountDownLatch countDownLatch = new CountDownLatch(1);
String firstKey = "x" + diff;
String secondKey = "o" + diff;
- MDC.put(firstKey, firstKey + A_SUFFIX);
+ mdcAdapter.put(firstKey, firstKey + A_SUFFIX);
- ChildThreadForMDC childThread = new ChildThreadForMDC(firstKey, secondKey, countDownLatch);
+ ChildThread childThread = new ChildThread(mdcAdapter, firstKey, secondKey, countDownLatch);
childThread.start();
countDownLatch.await();
- MDC.put(firstKey, firstKey + B_SUFFIX);
+ mdcAdapter.put(firstKey, firstKey + B_SUFFIX);
childThread.join();
- assertNull(MDC.get(secondKey));
- assertTrue(childThread.successul);
+ assertNull(mdcAdapter.get(secondKey));
+ assertTrue(childThread.successful);
- HashMap<String, String> parentHM = getHashMapFromMDC();
+ Map<String, String> parentHM = getMapFromMDCAdapter(mdcAdapter);
assertTrue(parentHM != childThread.childHM);
HashMap<String, String> parentHMWitness = new HashMap<String, String>();
@@ -152,36 +128,104 @@ public class LogbackMDCAdapterTest {
String firstKey = "x" + diff;
String secondKey = "o" + diff;
- MDC.put(firstKey, firstKey+A_SUFFIX);
- assertEquals(firstKey+A_SUFFIX, MDC.get(firstKey));
+ mdcAdapter.put(firstKey, firstKey + A_SUFFIX);
+ assertEquals(firstKey + A_SUFFIX, mdcAdapter.get(firstKey));
- Thread clearer = new ChildThreadForMDC(firstKey, secondKey) {
+ Thread clearer = new ChildThread(mdcAdapter, firstKey, secondKey) {
@Override
public void run() {
- MDC.clear();
- assertNull(MDC.get(firstKey));
+ mdcAdapter.clear();
+ assertNull(mdcAdapter.get(firstKey));
}
};
clearer.start();
clearer.join();
- assertEquals(firstKey+A_SUFFIX, MDC.get(firstKey));
+ assertEquals(firstKey + A_SUFFIX, mdcAdapter.get(firstKey));
}
- class ChildThreadForMDC extends Thread {
+ // see http://jira.qos.ch/browse/LBCLASSIC-289
+ // this test used to fail without synchronization code in LogbackMDCAdapter
+ @Test
+ public void nearSimultaneousPutsShouldNotCauseConcurrentModificationException() throws InterruptedException {
+ // For the weirdest reason, modifications to mdcAdapter must be done
+ // before the definition anonymous ChildThread class below. Otherwise, the
+ // map in the child thread, the one contained in mdcAdapter.copyOnInheritThreadLocal,
+ // is null. How strange is that?
+
+ // let the map have lots of elements so that copying it takes time
+ for (int i = 0; i < 2048; i++) {
+ mdcAdapter.put("k" + i, "v" + i);
+ }
+
+ ChildThread childThread = new ChildThread(mdcAdapter, null, null) {
+ @Override
+ public void run() {
+ for (int i = 0; i < 16; i++) {
+ mdcAdapter.put("ck" + i, "cv" + i);
+ Thread.yield();
+ }
+ successful = true;
+ }
+ };
+
+
+ childThread.start();
+ Thread.sleep(1);
+ for (int i = 0; i < 16; i++) {
+ mdcAdapter.put("K" + i, "V" + i);
+ }
+ childThread.join();
+ assertTrue(childThread.successful);
+ }
+
+ Map<String, String> getMapFromMDCAdapter(LogbackMDCAdapter lma) {
+ InheritableThreadLocal<Map<String, String>> copyOnInheritThreadLocal = lma.copyOnInheritThreadLocal;
+ return copyOnInheritThreadLocal.get();
+ }
+
+ // ========================== various thread classes
+ class ChildThreadForMDCAdapter extends Thread {
+
+ LogbackMDCAdapter logbackMDCAdapter;
+ boolean successul;
+ Map<String, String> childHM;
+
+ ChildThreadForMDCAdapter(LogbackMDCAdapter logbackMDCAdapter) {
+ this.logbackMDCAdapter = logbackMDCAdapter;
+ }
+
+ @Override
+ public void run() {
+ childHM = getMapFromMDCAdapter(logbackMDCAdapter);
+ logbackMDCAdapter.get("");
+ successul = true;
+ }
+ }
+
+
+ class ChildThread extends Thread {
+
+ LogbackMDCAdapter logbackMDCAdapter;
String firstKey;
String secondKey;
- boolean successul;
- HashMap<String, String> childHM;
+ boolean successful;
+ Map<String, String> childHM;
CountDownLatch countDownLatch;
- ChildThreadForMDC(String firstKey, String secondKey) {
- this(firstKey, secondKey, null);
+ ChildThread(LogbackMDCAdapter logbackMDCAdapter) {
+ this(logbackMDCAdapter, null, null);
+ }
+
+ ChildThread(LogbackMDCAdapter logbackMDCAdapter, String firstKey, String secondKey) {
+ this(logbackMDCAdapter, firstKey, secondKey, null);
}
- ChildThreadForMDC(String firstKey, String secondKey, CountDownLatch countDownLatch) {
+ ChildThread(LogbackMDCAdapter logbackMDCAdapter, String firstKey, String secondKey, CountDownLatch countDownLatch) {
+ super("chil");
+ this.logbackMDCAdapter = logbackMDCAdapter;
this.firstKey = firstKey;
this.secondKey = secondKey;
this.countDownLatch = countDownLatch;
@@ -189,24 +233,13 @@ public class LogbackMDCAdapterTest {
@Override
public void run() {
- MDC.put(secondKey, secondKey + A_SUFFIX);
- assertNotNull(MDC.get(firstKey));
- assertEquals(firstKey + A_SUFFIX, MDC.get(firstKey));
- if(countDownLatch != null) countDownLatch.countDown();
- assertEquals(secondKey + A_SUFFIX, MDC.get(secondKey));
- successul = true;
- childHM = getHashMapFromMDC();
+ logbackMDCAdapter.put(secondKey, secondKey + A_SUFFIX);
+ assertNotNull(logbackMDCAdapter.get(firstKey));
+ assertEquals(firstKey + A_SUFFIX, logbackMDCAdapter.get(firstKey));
+ if (countDownLatch != null) countDownLatch.countDown();
+ assertEquals(secondKey + A_SUFFIX, logbackMDCAdapter.get(secondKey));
+ successful = true;
+ childHM = getMapFromMDCAdapter(logbackMDCAdapter);
}
}
-
- HashMap<String, String> getHashMapFromMDCAdapter(LogbackMDCAdapter lma) {
- InheritableThreadLocal<HashMap<String, String>> copyOnInheritThreadLocal = lma.copyOnInheritThreadLocal;
- return copyOnInheritThreadLocal.get();
- }
-
- HashMap<String, String> getHashMapFromMDC() {
- LogbackMDCAdapter lma = (LogbackMDCAdapter) MDC.getMDCAdapter();
- InheritableThreadLocal<HashMap<String, String>> copyOnInheritThreadLocal = lma.copyOnInheritThreadLocal;
- return copyOnInheritThreadLocal.get();
- }
}
diff --git a/logback-site/src/site/pages/news.html b/logback-site/src/site/pages/news.html
index 2233c5e..7cfd392 100644
--- a/logback-site/src/site/pages/news.html
+++ b/logback-site/src/site/pages/news.html
@@ -40,9 +40,12 @@
<p>In the <code>ILoggingEvent</code> interface the
<code>getMDC</code> method is now deprecated and replaced by
- <code>getMDCPropertyMap</code>. The latter methof was already part
+ <code>getMDCPropertyMap</code>. The latter method was already part
of the <code>ILoggingEvent</code> interface in prior versions of
- logback-classic.</p>
+ logback-classic. Furthermore, the value returned by
+ <code>ILoggingEvent.getMDCPropertyMap</code> can now be an empty
+ map but never null.</p>
+
<p><code>LoggingEvent</code> no longer assumes that
<code>LogbackMDCAdapter</code> is the only possible implementation
@@ -51,6 +54,13 @@
reported by Chris Dolan.
</p>
+ <p><code>LogbackMDCAdapter</code> now synchronizes over its thread
+ local map. This prevents
+ <code>ConcurrentModificationException</code> from occuring while a
+ child thread copies the map from the parent. This fixes <a
+ href="http://jira.qos.ch/browse/LBCLASSIC-289">LBCLASSIC-289</a>
+ reported by Josh Oddman.</p>
+
<p>It is now possible to specify multiple destination addresses
separated by commas in the the <span class="option">to</span>
property of <code>SMTPAppender</code>. This fixes <a
@@ -60,7 +70,7 @@
addresses could only be specified by using multiple <span
class="option">to</span> properties. As of version 0.9.30 both
comma separated addresses and multiple <span
- class="option">to</span> properties are suported.
+ class="option">to</span> properties are supported.
</p>
<p>When debug attribute is set to true within the
-----------------------------------------------------------------------
Summary of changes:
.../logback/classic/util/LogbackMDCAdapter.java | 37 +++--
.../spi/LoggingEventSerializationPerfTest.java | 2 +
.../classic/util/LogbackMDCAdapterTest.java | 181 ++++++++++++--------
logback-site/src/site/pages/news.html | 16 ++-
4 files changed, 144 insertions(+), 92 deletions(-)
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