wip: low allocation marshalers for json exporters.

Author: vasantteja

docs/apidiffs/current_vs_latest/opentelemetry-exporter-logging-otlp.txt

@@ -1,2 +1,10 @@
 Comparing source compatibility of opentelemetry-exporter-logging-otlp-1.54.0-SNAPSHOT.jar against opentelemetry-exporter-logging-otlp-1.53.0.jar
-No changes.
+***  MODIFIED CLASS: PUBLIC FINAL io.opentelemetry.exporter.logging.otlp.OtlpJsonLoggingLogRecordExporter  (not serializable)
+	===  CLASS FILE FORMAT VERSION: 52.0 <- 52.0
+	+++  NEW METHOD: PUBLIC(+) STATIC(+) io.opentelemetry.sdk.logs.export.LogRecordExporter create(boolean)
+***  MODIFIED CLASS: PUBLIC FINAL io.opentelemetry.exporter.logging.otlp.OtlpJsonLoggingMetricExporter  (not serializable)
+	===  CLASS FILE FORMAT VERSION: 52.0 <- 52.0
+	+++  NEW METHOD: PUBLIC(+) STATIC(+) io.opentelemetry.sdk.metrics.export.MetricExporter create(io.opentelemetry.sdk.metrics.data.AggregationTemporality, boolean)
+***  MODIFIED CLASS: PUBLIC FINAL io.opentelemetry.exporter.logging.otlp.OtlpJsonLoggingSpanExporter  (not serializable)
+	===  CLASS FILE FORMAT VERSION: 52.0 <- 52.0
+	+++  NEW METHOD: PUBLIC(+) STATIC(+) io.opentelemetry.sdk.trace.export.SpanExporter create(boolean)

exporters/logging-otlp/src/main/java/io/opentelemetry/exporter/logging/otlp/OtlpJsonLoggingLogRecordExporter.java

@@ -8,6 +8,7 @@
 import io.opentelemetry.exporter.logging.otlp.internal.logs.OtlpStdoutLogRecordExporter;
 import io.opentelemetry.exporter.logging.otlp.internal.logs.OtlpStdoutLogRecordExporterBuilder;
 import io.opentelemetry.sdk.common.CompletableResultCode;
+import io.opentelemetry.sdk.common.export.MemoryMode;
 import io.opentelemetry.sdk.logs.data.LogRecordData;
 import io.opentelemetry.sdk.logs.export.LogRecordExporter;
 import java.util.Collection;
@@ -33,6 +34,24 @@ public static LogRecordExporter create() {
     return new OtlpJsonLoggingLogRecordExporter(delegate);
   }
 
+  /**
+   * Returns a new {@link OtlpJsonLoggingLogRecordExporter}.
+   *
+   * @param wrapperJsonObject whether to wrap the JSON object in an outer JSON "resourceLogs"
+   *     object. When {@code true}, uses low allocation OTLP marshalers with {@link
+   *     MemoryMode#REUSABLE_DATA}. When {@code false}, uses {@link MemoryMode#IMMUTABLE_DATA}.
+   */
+  public static LogRecordExporter create(boolean wrapperJsonObject) {
+    MemoryMode memoryMode =
+        wrapperJsonObject ? MemoryMode.REUSABLE_DATA : MemoryMode.IMMUTABLE_DATA;
+    OtlpStdoutLogRecordExporter delegate =
+        new OtlpStdoutLogRecordExporterBuilder(logger)
+            .setWrapperJsonObject(wrapperJsonObject)
+            .setMemoryMode(memoryMode)
+            .build();
+    return new OtlpJsonLoggingLogRecordExporter(delegate);
+  }
+
   OtlpJsonLoggingLogRecordExporter(OtlpStdoutLogRecordExporter delegate) {
     this.delegate = delegate;
   }

exporters/logging-otlp/src/main/java/io/opentelemetry/exporter/logging/otlp/OtlpJsonLoggingMetricExporter.java

@@ -8,6 +8,7 @@
 import io.opentelemetry.exporter.logging.otlp.internal.metrics.OtlpStdoutMetricExporter;
 import io.opentelemetry.exporter.logging.otlp.internal.metrics.OtlpStdoutMetricExporterBuilder;
 import io.opentelemetry.sdk.common.CompletableResultCode;
+import io.opentelemetry.sdk.common.export.MemoryMode;
 import io.opentelemetry.sdk.metrics.InstrumentType;
 import io.opentelemetry.sdk.metrics.data.AggregationTemporality;
 import io.opentelemetry.sdk.metrics.data.MetricData;
@@ -46,15 +47,36 @@ public static MetricExporter create(AggregationTemporality aggregationTemporalit
     return new OtlpJsonLoggingMetricExporter(delegate, aggregationTemporality);
   }
 
+  /**
+   * Returns a new {@link OtlpJsonLoggingMetricExporter} with the given {@code
+   * aggregationTemporality}.
+   *
+   * @param aggregationTemporality the aggregation temporality to use
+   * @param wrapperJsonObject whether to wrap the JSON object in an outer JSON "resourceMetrics"
+   *     object. When {@code true}, uses low allocation OTLP marshalers with {@link
+   *     MemoryMode#REUSABLE_DATA}. When {@code false}, uses {@link MemoryMode#IMMUTABLE_DATA}.
+   */
+  public static MetricExporter create(
+      AggregationTemporality aggregationTemporality, boolean wrapperJsonObject) {
+    MemoryMode memoryMode =
+        wrapperJsonObject ? MemoryMode.REUSABLE_DATA : MemoryMode.IMMUTABLE_DATA;
+    OtlpStdoutMetricExporter delegate =
+        new OtlpStdoutMetricExporterBuilder(logger)
+            .setWrapperJsonObject(wrapperJsonObject)
+            .setMemoryMode(memoryMode)
+            .build();
+    return new OtlpJsonLoggingMetricExporter(delegate, aggregationTemporality);
+  }
+
   OtlpJsonLoggingMetricExporter(
       OtlpStdoutMetricExporter delegate, AggregationTemporality aggregationTemporality) {
     this.delegate = delegate;
     this.aggregationTemporality = aggregationTemporality;
   }
 
   @Override
-  public CompletableResultCode export(Collection<MetricData> logs) {
-    return delegate.export(logs);
+  public CompletableResultCode export(Collection<MetricData> metrics) {
+    return delegate.export(metrics);
   }
 
   @Override

exporters/logging-otlp/src/main/java/io/opentelemetry/exporter/logging/otlp/OtlpJsonLoggingSpanExporter.java

@@ -8,6 +8,7 @@
 import io.opentelemetry.exporter.logging.otlp.internal.traces.OtlpStdoutSpanExporter;
 import io.opentelemetry.exporter.logging.otlp.internal.traces.OtlpStdoutSpanExporterBuilder;
 import io.opentelemetry.sdk.common.CompletableResultCode;
+import io.opentelemetry.sdk.common.export.MemoryMode;
 import io.opentelemetry.sdk.trace.data.SpanData;
 import io.opentelemetry.sdk.trace.export.SpanExporter;
 import java.util.Collection;
@@ -31,13 +32,31 @@ public static SpanExporter create() {
     return new OtlpJsonLoggingSpanExporter(delegate);
   }
 
+  /**
+   * Returns a new {@link OtlpJsonLoggingSpanExporter}.
+   *
+   * @param wrapperJsonObject whether to wrap the JSON object in an outer JSON "resourceSpans"
+   *     object. When {@code true}, uses low allocation OTLP marshalers with {@link
+   *     MemoryMode#REUSABLE_DATA}. When {@code false}, uses {@link MemoryMode#IMMUTABLE_DATA}.
+   */
+  public static SpanExporter create(boolean wrapperJsonObject) {
+    MemoryMode memoryMode =
+        wrapperJsonObject ? MemoryMode.REUSABLE_DATA : MemoryMode.IMMUTABLE_DATA;
+    OtlpStdoutSpanExporter delegate =
+        new OtlpStdoutSpanExporterBuilder(logger)
+            .setWrapperJsonObject(wrapperJsonObject)
+            .setMemoryMode(memoryMode)
+            .build();
+    return new OtlpJsonLoggingSpanExporter(delegate);
+  }
+
   OtlpJsonLoggingSpanExporter(OtlpStdoutSpanExporter delegate) {
     this.delegate = delegate;
   }
 
   @Override
-  public CompletableResultCode export(Collection<SpanData> logs) {
-    return delegate.export(logs);
+  public CompletableResultCode export(Collection<SpanData> spans) {
+    return delegate.export(spans);
   }
 
   @Override