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The following commit(s) were added to refs/heads/main by this push:
new 06c55fbea4 Create Gson singleton to use in place of new instances
(#3516)
06c55fbea4 is described below
commit 06c55fbea47f7ac376c7c93b48b76529e0d4a474
Author: Dom G <domgargu...@apache.org>
AuthorDate: Thu Jun 22 15:26:36 2023 -0400
Create Gson singleton to use in place of new instances (#3516)
* Create Gson singleton to use in place of new instances
---------
Co-authored-by: Dave Marion <dlmar...@apache.org>
---
.../core/clientImpl/bulk/BulkSerialize.java | 3 +-
.../apache/accumulo/core/lock/ServiceLockData.java | 11 +++---
.../schema/ExternalCompactionFinalState.java | 8 ++--
.../schema/ExternalCompactionMetadata.java | 9 ++---
.../core/metadata/schema/RootTabletMetadata.java | 8 ++--
.../spi/compaction/DefaultCompactionPlanner.java | 6 +--
.../spi/scan/ConfigurableScanServerSelector.java | 7 ++--
.../apache/accumulo/core/util/GsonSingleton.java | 44 ++++++++++++++++++++++
.../accumulo/server/metadata/RootGcCandidates.java | 8 ++--
.../accumulo/manager/tableOps/TraceRepo.java | 5 +--
.../util/logging/AccumuloMonitorAppender.java | 6 +--
.../accumulo/test/CountNameNodeOpsBulkIT.java | 5 +--
12 files changed, 75 insertions(+), 45 deletions(-)
diff --git
a/core/src/main/java/org/apache/accumulo/core/clientImpl/bulk/BulkSerialize.java
b/core/src/main/java/org/apache/accumulo/core/clientImpl/bulk/BulkSerialize.java
index 5c2771c3b5..bff210ee80 100644
---
a/core/src/main/java/org/apache/accumulo/core/clientImpl/bulk/BulkSerialize.java
+++
b/core/src/main/java/org/apache/accumulo/core/clientImpl/bulk/BulkSerialize.java
@@ -37,6 +37,7 @@ import org.apache.accumulo.core.clientImpl.bulk.Bulk.Files;
import org.apache.accumulo.core.clientImpl.bulk.Bulk.Mapping;
import org.apache.accumulo.core.data.TableId;
import org.apache.accumulo.core.dataImpl.KeyExtent;
+import org.apache.accumulo.core.util.GsonSingleton;
import org.apache.accumulo.core.util.json.ByteArrayToBase64TypeAdapter;
import org.apache.hadoop.fs.Path;
@@ -97,7 +98,7 @@ public class BulkSerialize {
final Path renamingFile = new Path(bulkDir, Constants.BULK_RENAME_FILE);
try (OutputStream fsOut = output.create(renamingFile);
BufferedWriter writer = new BufferedWriter(new
OutputStreamWriter(fsOut))) {
- new Gson().toJson(oldToNewNameMap, writer);
+ GsonSingleton.getInstance().toJson(oldToNewNameMap, writer);
}
}
diff --git
a/core/src/main/java/org/apache/accumulo/core/lock/ServiceLockData.java
b/core/src/main/java/org/apache/accumulo/core/lock/ServiceLockData.java
index 746d5b5ce5..ed624be642 100644
--- a/core/src/main/java/org/apache/accumulo/core/lock/ServiceLockData.java
+++ b/core/src/main/java/org/apache/accumulo/core/lock/ServiceLockData.java
@@ -29,14 +29,12 @@ import java.util.Set;
import java.util.UUID;
import org.apache.accumulo.core.util.AddressUtil;
+import org.apache.accumulo.core.util.GsonSingleton;
import com.google.common.net.HostAndPort;
-import com.google.gson.Gson;
public class ServiceLockData implements Comparable<ServiceLockData> {
- private static final Gson gson = new Gson();
-
/**
* Thrift Service list
*/
@@ -119,7 +117,7 @@ public class ServiceLockData implements
Comparable<ServiceLockData> {
@Override
public String toString() {
- return gson.toJson(this);
+ return GsonSingleton.getInstance().toJson(this);
}
}
@@ -195,7 +193,7 @@ public class ServiceLockData implements
Comparable<ServiceLockData> {
public byte[] serialize() {
ServiceDescriptors sd = new ServiceDescriptors();
services.values().forEach(s -> sd.addService(s));
- return gson.toJson(sd).getBytes(UTF_8);
+ return GsonSingleton.getInstance().toJson(sd).getBytes(UTF_8);
}
@Override
@@ -229,7 +227,8 @@ public class ServiceLockData implements
Comparable<ServiceLockData> {
if (data.isBlank()) {
return Optional.empty();
}
- return Optional.of(new ServiceLockData(gson.fromJson(data,
ServiceDescriptors.class)));
+ return Optional.of(
+ new ServiceLockData(GsonSingleton.getInstance().fromJson(data,
ServiceDescriptors.class)));
}
}
diff --git
a/core/src/main/java/org/apache/accumulo/core/metadata/schema/ExternalCompactionFinalState.java
b/core/src/main/java/org/apache/accumulo/core/metadata/schema/ExternalCompactionFinalState.java
index 9212ccde9f..1ebf5c400c 100644
---
a/core/src/main/java/org/apache/accumulo/core/metadata/schema/ExternalCompactionFinalState.java
+++
b/core/src/main/java/org/apache/accumulo/core/metadata/schema/ExternalCompactionFinalState.java
@@ -22,16 +22,14 @@ import java.util.Base64;
import org.apache.accumulo.core.data.TableId;
import org.apache.accumulo.core.dataImpl.KeyExtent;
+import org.apache.accumulo.core.util.GsonSingleton;
import org.apache.accumulo.core.util.TextUtil;
import org.apache.hadoop.io.Text;
import com.google.common.base.Preconditions;
-import com.google.gson.Gson;
public class ExternalCompactionFinalState {
- private static final Gson GSON = new Gson();
-
public enum FinalState {
FINISHED, FAILED
}
@@ -123,11 +121,11 @@ public class ExternalCompactionFinalState {
jd.fileSize = fileSize;
jd.entries = fileEntries;
jd.extent = new Extent(extent);
- return GSON.toJson(jd);
+ return GsonSingleton.getInstance().toJson(jd);
}
public static ExternalCompactionFinalState fromJson(ExternalCompactionId
ecid, String json) {
- JsonData jd = GSON.fromJson(json, JsonData.class);
+ JsonData jd = GsonSingleton.getInstance().fromJson(json, JsonData.class);
return new ExternalCompactionFinalState(ecid, jd.extent.toKeyExtent(),
FinalState.valueOf(jd.state), jd.fileSize, jd.entries);
}
diff --git
a/core/src/main/java/org/apache/accumulo/core/metadata/schema/ExternalCompactionMetadata.java
b/core/src/main/java/org/apache/accumulo/core/metadata/schema/ExternalCompactionMetadata.java
index 2373160cfc..de617e5e03 100644
---
a/core/src/main/java/org/apache/accumulo/core/metadata/schema/ExternalCompactionMetadata.java
+++
b/core/src/main/java/org/apache/accumulo/core/metadata/schema/ExternalCompactionMetadata.java
@@ -29,15 +29,12 @@ import
org.apache.accumulo.core.metadata.ReferencedTabletFile;
import org.apache.accumulo.core.metadata.StoredTabletFile;
import org.apache.accumulo.core.spi.compaction.CompactionExecutorId;
import org.apache.accumulo.core.spi.compaction.CompactionKind;
+import org.apache.accumulo.core.util.GsonSingleton;
import org.apache.accumulo.core.util.compaction.CompactionExecutorIdImpl;
import org.apache.hadoop.fs.Path;
-import com.google.gson.Gson;
-
public class ExternalCompactionMetadata {
- private static final Gson GSON = new Gson();
-
private final Set<StoredTabletFile> jobFiles;
private final Set<StoredTabletFile> nextFiles;
private final ReferencedTabletFile compactTmpName;
@@ -140,11 +137,11 @@ public class ExternalCompactionMetadata {
jData.propDels = propagateDeletes;
jData.selectedAll = initiallySelectedAll;
jData.compactionId = compactionId;
- return GSON.toJson(jData);
+ return GsonSingleton.getInstance().toJson(jData);
}
public static ExternalCompactionMetadata fromJson(String json) {
- GSonData jData = GSON.fromJson(json, GSonData.class);
+ GSonData jData = GsonSingleton.getInstance().fromJson(json,
GSonData.class);
return new ExternalCompactionMetadata(
jData.inputs.stream().map(StoredTabletFile::new).collect(toSet()),
diff --git
a/core/src/main/java/org/apache/accumulo/core/metadata/schema/RootTabletMetadata.java
b/core/src/main/java/org/apache/accumulo/core/metadata/schema/RootTabletMetadata.java
index 3f01eed6c4..e0601f94a7 100644
---
a/core/src/main/java/org/apache/accumulo/core/metadata/schema/RootTabletMetadata.java
+++
b/core/src/main/java/org/apache/accumulo/core/metadata/schema/RootTabletMetadata.java
@@ -37,12 +37,11 @@ import org.apache.accumulo.core.data.Value;
import org.apache.accumulo.core.metadata.RootTable;
import
org.apache.accumulo.core.metadata.schema.MetadataSchema.TabletsSection.CurrentLocationColumnFamily;
import
org.apache.accumulo.core.metadata.schema.MetadataSchema.TabletsSection.FutureLocationColumnFamily;
+import org.apache.accumulo.core.util.GsonSingleton;
import org.apache.hadoop.io.Text;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
-import com.google.gson.Gson;
-
/**
* This class is used to serialize and deserialize root tablet metadata using
GSon. The only data
* stored about the Root Table is the COLUMN_FAMILY, COLUMN_QUALIFIER and
VALUE.
@@ -93,12 +92,11 @@ public class RootTabletMetadata {
}
}
- private final Gson gson = new Gson();
private final Data data;
public RootTabletMetadata(String json) {
log.trace("Creating root tablet metadata from stored JSON: {}", json);
- this.data = gson.fromJson(json, Data.class);
+ this.data = GsonSingleton.getInstance().fromJson(json, Data.class);
checkArgument(data.version == VERSION, "Invalid Root Table Metadata JSON
version %s",
data.version);
data.columnValues.forEach((fam, qualVals) -> {
@@ -164,7 +162,7 @@ public class RootTabletMetadata {
* @return a JSON representation of the root tablet's data.
*/
public String toJson() {
- return gson.toJson(data);
+ return GsonSingleton.getInstance().toJson(data);
}
}
diff --git
a/core/src/main/java/org/apache/accumulo/core/spi/compaction/DefaultCompactionPlanner.java
b/core/src/main/java/org/apache/accumulo/core/spi/compaction/DefaultCompactionPlanner.java
index 11feb5c60e..f8a0cbd90d 100644
---
a/core/src/main/java/org/apache/accumulo/core/spi/compaction/DefaultCompactionPlanner.java
+++
b/core/src/main/java/org/apache/accumulo/core/spi/compaction/DefaultCompactionPlanner.java
@@ -31,10 +31,10 @@ import java.util.Set;
import org.apache.accumulo.core.client.admin.compaction.CompactableFile;
import org.apache.accumulo.core.conf.ConfigurationTypeHelper;
+import org.apache.accumulo.core.util.GsonSingleton;
import org.apache.accumulo.core.util.compaction.CompactionJobPrioritizer;
import com.google.common.base.Preconditions;
-import com.google.gson.Gson;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
@@ -145,8 +145,8 @@ public class DefaultCompactionPlanner implements
CompactionPlanner {
justification = "Field is written by Gson")
@Override
public void init(InitParameters params) {
- ExecutorConfig[] execConfigs =
- new Gson().fromJson(params.getOptions().get("executors"),
ExecutorConfig[].class);
+ ExecutorConfig[] execConfigs = GsonSingleton.getInstance()
+ .fromJson(params.getOptions().get("executors"),
ExecutorConfig[].class);
List<Executor> tmpExec = new ArrayList<>();
diff --git
a/core/src/main/java/org/apache/accumulo/core/spi/scan/ConfigurableScanServerSelector.java
b/core/src/main/java/org/apache/accumulo/core/spi/scan/ConfigurableScanServerSelector.java
index 2e792180cc..cb2848cef2 100644
---
a/core/src/main/java/org/apache/accumulo/core/spi/scan/ConfigurableScanServerSelector.java
+++
b/core/src/main/java/org/apache/accumulo/core/spi/scan/ConfigurableScanServerSelector.java
@@ -35,13 +35,13 @@ import java.util.function.Supplier;
import org.apache.accumulo.core.conf.ConfigurationTypeHelper;
import org.apache.accumulo.core.data.TabletId;
+import org.apache.accumulo.core.util.GsonSingleton;
import com.google.common.base.Preconditions;
import com.google.common.base.Suppliers;
import com.google.common.collect.Sets;
import com.google.common.hash.HashCode;
import com.google.common.hash.Hashing;
-import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
@@ -263,9 +263,8 @@ public class ConfigurableScanServerSelector implements
ScanServerSelector {
private void parseProfiles(Map<String,String> options) {
Type listType = new TypeToken<ArrayList<Profile>>() {}.getType();
- Gson gson = new Gson();
- List<Profile> profList =
- gson.fromJson(options.getOrDefault("profiles", PROFILES_DEFAULT),
listType);
+ List<Profile> profList = GsonSingleton.getInstance()
+ .fromJson(options.getOrDefault("profiles", PROFILES_DEFAULT),
listType);
profiles = new HashMap<>();
defaultProfile = null;
diff --git
a/core/src/main/java/org/apache/accumulo/core/util/GsonSingleton.java
b/core/src/main/java/org/apache/accumulo/core/util/GsonSingleton.java
new file mode 100644
index 0000000000..44c7369305
--- /dev/null
+++ b/core/src/main/java/org/apache/accumulo/core/util/GsonSingleton.java
@@ -0,0 +1,44 @@
+/*
+ * 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
+ *
+ * https://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 org.apache.accumulo.core.util;
+
+import com.google.gson.Gson;
+
+/**
+ * This class provides access to a shared instance of Gson that uses its
default configuration. Gson
+ * is thread-safe, so it should be safe to create and reuse a single instance.
+ * <p>
+ * If you need to use a Gson instance that is configured differently, if you
want to configure
+ * TypeAdapters for example, then you should not use this. You should
construct your own instance of
+ * Gson.
+ */
+public class GsonSingleton {
+ private static Gson gsonInstance = null;
+
+ private GsonSingleton() {
+ // private to prevent direct instantiation
+ }
+
+ public static Gson getInstance() {
+ if (gsonInstance == null) {
+ gsonInstance = new Gson();
+ }
+ return gsonInstance;
+ }
+}
diff --git
a/server/base/src/main/java/org/apache/accumulo/server/metadata/RootGcCandidates.java
b/server/base/src/main/java/org/apache/accumulo/server/metadata/RootGcCandidates.java
index 95874fc2be..3627024b68 100644
---
a/server/base/src/main/java/org/apache/accumulo/server/metadata/RootGcCandidates.java
+++
b/server/base/src/main/java/org/apache/accumulo/server/metadata/RootGcCandidates.java
@@ -27,15 +27,13 @@ import java.util.TreeSet;
import java.util.stream.Stream;
import org.apache.accumulo.core.metadata.StoredTabletFile;
+import org.apache.accumulo.core.util.GsonSingleton;
import org.apache.hadoop.fs.Path;
-import com.google.gson.Gson;
-
public class RootGcCandidates {
// Version 1. Released with Accumulo version 2.1.0
private static final int VERSION = 1;
- private final Gson gson = new Gson();
private final Data data;
// This class is used to serialize and deserialize root tablet metadata
using GSon. Any changes to
@@ -63,7 +61,7 @@ public class RootGcCandidates {
}
public RootGcCandidates(String jsonString) {
- this.data = gson.fromJson(jsonString, Data.class);
+ this.data = GsonSingleton.getInstance().fromJson(jsonString, Data.class);
checkArgument(data.version == VERSION, "Invalid Root Table GC Candidates
JSON version %s",
data.version);
data.candidates.forEach((parent, files) -> {
@@ -95,7 +93,7 @@ public class RootGcCandidates {
}
public String toJson() {
- return gson.toJson(data);
+ return GsonSingleton.getInstance().toJson(data);
}
}
diff --git
a/server/manager/src/main/java/org/apache/accumulo/manager/tableOps/TraceRepo.java
b/server/manager/src/main/java/org/apache/accumulo/manager/tableOps/TraceRepo.java
index a97f9d27ff..5c9045a072 100644
---
a/server/manager/src/main/java/org/apache/accumulo/manager/tableOps/TraceRepo.java
+++
b/server/manager/src/main/java/org/apache/accumulo/manager/tableOps/TraceRepo.java
@@ -21,10 +21,9 @@ package org.apache.accumulo.manager.tableOps;
import org.apache.accumulo.core.clientImpl.thrift.TInfo;
import org.apache.accumulo.core.fate.Repo;
import org.apache.accumulo.core.trace.TraceUtil;
+import org.apache.accumulo.core.util.GsonSingleton;
import org.apache.accumulo.manager.Manager;
-import com.google.gson.Gson;
-
import io.opentelemetry.api.trace.Span;
import io.opentelemetry.context.Scope;
@@ -106,6 +105,6 @@ public class TraceRepo<T> implements Repo<T> {
// Inorder for Gson to work with generic types, the following passes
repo.getClass() to Gson.
// See the Gson javadoc for more info.
- return repo.getClass() + " " + new Gson().toJson(repo, repo.getClass());
+ return repo.getClass() + " " + GsonSingleton.getInstance().toJson(repo,
repo.getClass());
}
}
diff --git
a/server/monitor/src/main/java/org/apache/accumulo/monitor/util/logging/AccumuloMonitorAppender.java
b/server/monitor/src/main/java/org/apache/accumulo/monitor/util/logging/AccumuloMonitorAppender.java
index 7dfde0f3fa..ed14bb4f7d 100644
---
a/server/monitor/src/main/java/org/apache/accumulo/monitor/util/logging/AccumuloMonitorAppender.java
+++
b/server/monitor/src/main/java/org/apache/accumulo/monitor/util/logging/AccumuloMonitorAppender.java
@@ -33,6 +33,7 @@ import java.util.function.Supplier;
import org.apache.accumulo.core.Constants;
import org.apache.accumulo.core.conf.SiteConfiguration;
import org.apache.accumulo.core.fate.zookeeper.ZooCache.ZcStat;
+import org.apache.accumulo.core.util.GsonSingleton;
import org.apache.accumulo.core.util.Pair;
import org.apache.accumulo.monitor.rest.logs.LogResource;
import org.apache.accumulo.monitor.rest.logs.SingleLogEvent;
@@ -46,8 +47,6 @@ import org.apache.logging.log4j.core.config.Property;
import org.apache.logging.log4j.core.config.plugins.Plugin;
import org.apache.logging.log4j.core.config.plugins.PluginBuilderFactory;
-import com.google.gson.Gson;
-
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
/**
@@ -75,7 +74,6 @@ public class AccumuloMonitorAppender extends AbstractAppender
{
}
- private final Gson gson = new Gson();
private final HttpClient httpClient = HttpClient.newHttpClient();
private final Supplier<Optional<URI>> monitorLocator;
@@ -118,7 +116,7 @@ public class AccumuloMonitorAppender extends
AbstractAppender {
pojo.message = event.getMessage().getFormattedMessage();
pojo.stacktrace = throwableToStacktrace(event.getThrown());
- String jsonEvent = gson.toJson(pojo);
+ String jsonEvent = GsonSingleton.getInstance().toJson(pojo);
var req =
HttpRequest.newBuilder(uri).POST(BodyPublishers.ofString(jsonEvent, UTF_8))
.setHeader("Content-Type", "application/json").build();
diff --git
a/test/src/main/java/org/apache/accumulo/test/CountNameNodeOpsBulkIT.java
b/test/src/main/java/org/apache/accumulo/test/CountNameNodeOpsBulkIT.java
index 4efdc52d22..10f01dfc14 100644
--- a/test/src/main/java/org/apache/accumulo/test/CountNameNodeOpsBulkIT.java
+++ b/test/src/main/java/org/apache/accumulo/test/CountNameNodeOpsBulkIT.java
@@ -46,6 +46,7 @@ import org.apache.accumulo.core.file.rfile.RFile;
import org.apache.accumulo.core.manager.thrift.ManagerMonitorInfo;
import org.apache.accumulo.core.metadata.UnreferencedTabletFile;
import org.apache.accumulo.core.spi.crypto.NoCryptoServiceFactory;
+import org.apache.accumulo.core.util.GsonSingleton;
import org.apache.accumulo.minicluster.ServerType;
import org.apache.accumulo.miniclusterImpl.MiniAccumuloConfigImpl;
import org.apache.accumulo.test.functional.ConfigurableMacBase;
@@ -56,8 +57,6 @@ import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
import org.junit.jupiter.api.Test;
-import com.google.gson.Gson;
-
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
/**
@@ -79,7 +78,7 @@ public class CountNameNodeOpsBulkIT extends
ConfigurableMacBase {
URL url = new URL(uri + "/jmx");
log.debug("Fetching web page " + url);
String jsonString = FunctionalTestUtils.readWebPage(url).body();
- Map<?,?> jsonObject = new Gson().fromJson(jsonString, Map.class);
+ Map<?,?> jsonObject = GsonSingleton.getInstance().fromJson(jsonString,
Map.class);
List<?> beans = (List<?>) jsonObject.get("beans");
for (Object bean : beans) {
Map<?,?> map = (Map<?,?>) bean;
