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Rework synchronization in ProtobufMapper #484

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Merged
merged 3 commits into from
Apr 7, 2024
Merged

Rework synchronization in ProtobufMapper #484

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be73b99
remove synchronization from ProtobufMapper
pjfanning Mar 27, 2024
57699ee
Update ProtobufMapper.java
pjfanning Mar 27, 2024
dbe79e9
Add release notes, rename lock
cowtowncoder Apr 7, 2024
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17 changes: 14 additions & 3 deletions protobuf/src/main/java/com/fasterxml/jackson/dataformat/protobuf/ProtobufMapper.java
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.concurrent.locks.ReentrantLock;

import com.fasterxml.jackson.core.Version;
import com.fasterxml.jackson.core.type.TypeReference;
Expand All @@ -21,6 +22,8 @@ public class ProtobufMapper extends ObjectMapper
{
private static final long serialVersionUID = 1L;

private final ReentrantLock _lock = new ReentrantLock();

/**
* Base implementation for "Vanilla" {@link ObjectMapper}, used with
* Protobuf backend.
Expand All @@ -42,7 +45,7 @@ public Builder(ProtobufMapper m) {
*
* @since 2.9
*/
protected DescriptorLoader _descriptorLoader;
protected volatile DescriptorLoader _descriptorLoader;

/*
/**********************************************************
Expand Down Expand Up @@ -192,11 +195,19 @@ public FileDescriptorSet loadDescriptorSet(InputStream src) throws IOException {
*
* @since 2.9
*/
public synchronized DescriptorLoader descriptorLoader() throws IOException
public DescriptorLoader descriptorLoader() throws IOException
{
DescriptorLoader l = _descriptorLoader;
if (l == null) {
_descriptorLoader = l = DescriptorLoader.construct(this);
_lock.lock();
try {
l = _descriptorLoader;
if (l == null) {
_descriptorLoader = l = DescriptorLoader.construct(this);
}
} finally {
_lock.unlock();
}
}
return l;
}
Expand Down