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DefaultMeter.java
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DefaultMeter.java
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/*
* Copyright The OpenTelemetry Authors
* SPDX-License-Identifier: Apache-2.0
*/
package io.opentelemetry.metrics;
import io.opentelemetry.common.Labels;
import io.opentelemetry.internal.StringUtils;
import io.opentelemetry.internal.Utils;
import java.util.Objects;
import javax.annotation.concurrent.Immutable;
import javax.annotation.concurrent.ThreadSafe;
/** No-op implementations of {@link Meter}. */
@ThreadSafe
public final class DefaultMeter implements Meter {
private static final DefaultMeter INSTANCE = new DefaultMeter();
private static final String COUNTERS_CAN_ONLY_INCREASE = "Counters can only increase";
/* VisibleForTesting */ static final String ERROR_MESSAGE_INVALID_NAME =
"Name should be a ASCII string with a length no greater than "
+ StringUtils.METRIC_NAME_MAX_LENGTH
+ " characters.";
/**
* Returns a {@code Meter} singleton that is the default implementations for {@link Meter}.
*
* @return a {@code Meter} singleton that is the default implementations for {@link Meter}.
*/
public static Meter getInstance() {
return INSTANCE;
}
@Override
public DoubleCounter.Builder doubleCounterBuilder(String name) {
Objects.requireNonNull(name, "name");
Utils.checkArgument(StringUtils.isValidMetricName(name), ERROR_MESSAGE_INVALID_NAME);
return new NoopDoubleCounter.NoopBuilder();
}
@Override
public LongCounter.Builder longCounterBuilder(String name) {
Objects.requireNonNull(name, "name");
Utils.checkArgument(StringUtils.isValidMetricName(name), ERROR_MESSAGE_INVALID_NAME);
return new NoopLongCounter.NoopBuilder();
}
@Override
public DoubleUpDownCounter.Builder doubleUpDownCounterBuilder(String name) {
Objects.requireNonNull(name, "name");
Utils.checkArgument(StringUtils.isValidMetricName(name), ERROR_MESSAGE_INVALID_NAME);
return new NoopDoubleUpDownCounter.NoopBuilder();
}
@Override
public LongUpDownCounter.Builder longUpDownCounterBuilder(String name) {
Objects.requireNonNull(name, "name");
Utils.checkArgument(StringUtils.isValidMetricName(name), ERROR_MESSAGE_INVALID_NAME);
return new NoopLongUpDownCounter.NoopBuilder();
}
@Override
public DoubleValueRecorder.Builder doubleValueRecorderBuilder(String name) {
Objects.requireNonNull(name, "name");
Utils.checkArgument(StringUtils.isValidMetricName(name), ERROR_MESSAGE_INVALID_NAME);
return new NoopDoubleValueRecorder.NoopBuilder();
}
@Override
public LongValueRecorder.Builder longValueRecorderBuilder(String name) {
Objects.requireNonNull(name, "name");
Utils.checkArgument(StringUtils.isValidMetricName(name), ERROR_MESSAGE_INVALID_NAME);
return new NoopLongValueRecorder.NoopBuilder();
}
@Override
public DoubleSumObserver.Builder doubleSumObserverBuilder(String name) {
Objects.requireNonNull(name, "name");
Utils.checkArgument(StringUtils.isValidMetricName(name), ERROR_MESSAGE_INVALID_NAME);
return new NoopDoubleSumObserver.NoopBuilder();
}
@Override
public LongSumObserver.Builder longSumObserverBuilder(String name) {
Objects.requireNonNull(name, "name");
Utils.checkArgument(StringUtils.isValidMetricName(name), ERROR_MESSAGE_INVALID_NAME);
return new NoopLongSumObserver.NoopBuilder();
}
@Override
public DoubleUpDownSumObserver.Builder doubleUpDownSumObserverBuilder(String name) {
Objects.requireNonNull(name, "name");
Utils.checkArgument(StringUtils.isValidMetricName(name), ERROR_MESSAGE_INVALID_NAME);
return new NoopDoubleUpDownSumObserver.NoopBuilder();
}
@Override
public LongUpDownSumObserver.Builder longUpDownSumObserverBuilder(String name) {
Objects.requireNonNull(name, "name");
Utils.checkArgument(StringUtils.isValidMetricName(name), ERROR_MESSAGE_INVALID_NAME);
return new NoopLongUpDownSumObserver.NoopBuilder();
}
@Override
public DoubleValueObserver.Builder doubleValueObserverBuilder(String name) {
Objects.requireNonNull(name, "name");
Utils.checkArgument(StringUtils.isValidMetricName(name), ERROR_MESSAGE_INVALID_NAME);
return new NoopDoubleValueObserver.NoopBuilder();
}
@Override
public LongValueObserver.Builder longValueObserverBuilder(String name) {
Objects.requireNonNull(name, "name");
Utils.checkArgument(StringUtils.isValidMetricName(name), ERROR_MESSAGE_INVALID_NAME);
return new NoopLongValueObserver.NoopBuilder();
}
@Override
public BatchRecorder newBatchRecorder(String... keyValuePairs) {
Utils.validateLabelPairs(keyValuePairs);
return NoopBatchRecorder.INSTANCE;
}
private DefaultMeter() {}
/** No-op implementation of {@link DoubleCounter} interface. */
@Immutable
private static final class NoopDoubleCounter implements DoubleCounter {
private NoopDoubleCounter() {}
@Override
public void add(double increment, Labels labels) {
Objects.requireNonNull(labels, "labels");
Utils.checkArgument(increment >= 0.0, COUNTERS_CAN_ONLY_INCREASE);
}
@Override
public void add(double increment) {
add(increment, Labels.empty());
}
@Override
public NoopBoundDoubleCounter bind(Labels labels) {
Objects.requireNonNull(labels, "labels");
return NoopBoundDoubleCounter.INSTANCE;
}
@Immutable
private enum NoopBoundDoubleCounter implements BoundDoubleCounter {
INSTANCE;
@Override
public void add(double increment) {
Utils.checkArgument(increment >= 0.0, COUNTERS_CAN_ONLY_INCREASE);
}
@Override
public void unbind() {}
}
private static final class NoopBuilder extends NoopAbstractInstrumentBuilder<NoopBuilder>
implements Builder {
@Override
protected NoopBuilder getThis() {
return this;
}
@Override
public DoubleCounter build() {
return new NoopDoubleCounter();
}
}
}
/** No-op implementation of {@link LongCounter} interface. */
@Immutable
private static final class NoopLongCounter implements LongCounter {
private NoopLongCounter() {}
@Override
public void add(long increment, Labels labels) {
Objects.requireNonNull(labels, "labels");
Utils.checkArgument(increment >= 0, COUNTERS_CAN_ONLY_INCREASE);
}
@Override
public void add(long increment) {
add(increment, Labels.empty());
}
@Override
public NoopBoundLongCounter bind(Labels labels) {
Objects.requireNonNull(labels, "labels");
return NoopBoundLongCounter.INSTANCE;
}
@Immutable
private enum NoopBoundLongCounter implements BoundLongCounter {
INSTANCE;
@Override
public void add(long increment) {
Utils.checkArgument(increment >= 0, COUNTERS_CAN_ONLY_INCREASE);
}
@Override
public void unbind() {}
}
private static final class NoopBuilder extends NoopAbstractInstrumentBuilder<NoopBuilder>
implements Builder {
@Override
protected NoopBuilder getThis() {
return this;
}
@Override
public LongCounter build() {
return new NoopLongCounter();
}
}
}
/** No-op implementation of {@link DoubleUpDownCounter} interface. */
@Immutable
private static final class NoopDoubleUpDownCounter implements DoubleUpDownCounter {
private NoopDoubleUpDownCounter() {}
@Override
public void add(double increment, Labels labels) {
Objects.requireNonNull(labels, "labels");
}
@Override
public void add(double increment) {
add(increment, Labels.empty());
}
@Override
public NoopBoundDoubleUpDownCounter bind(Labels labels) {
Objects.requireNonNull(labels, "labels");
return NoopBoundDoubleUpDownCounter.INSTANCE;
}
@Immutable
private enum NoopBoundDoubleUpDownCounter implements BoundDoubleUpDownCounter {
INSTANCE;
@Override
public void add(double increment) {}
@Override
public void unbind() {}
}
private static final class NoopBuilder extends NoopAbstractInstrumentBuilder<NoopBuilder>
implements Builder {
@Override
protected NoopBuilder getThis() {
return this;
}
@Override
public DoubleUpDownCounter build() {
return new NoopDoubleUpDownCounter();
}
}
}
/** No-op implementation of {@link LongUpDownCounter} interface. */
@Immutable
private static final class NoopLongUpDownCounter implements LongUpDownCounter {
private NoopLongUpDownCounter() {}
@Override
public void add(long increment, Labels labels) {
Objects.requireNonNull(labels, "labels");
}
@Override
public void add(long increment) {
add(increment, Labels.empty());
}
@Override
public NoopBoundLongUpDownCounter bind(Labels labels) {
Objects.requireNonNull(labels, "labels");
return NoopBoundLongUpDownCounter.INSTANCE;
}
@Immutable
private enum NoopBoundLongUpDownCounter implements BoundLongUpDownCounter {
INSTANCE;
@Override
public void add(long increment) {}
@Override
public void unbind() {}
}
private static final class NoopBuilder extends NoopAbstractInstrumentBuilder<NoopBuilder>
implements Builder {
@Override
protected NoopBuilder getThis() {
return this;
}
@Override
public LongUpDownCounter build() {
return new NoopLongUpDownCounter();
}
}
}
/** No-op implementation of {@link DoubleValueRecorder} interface. */
@Immutable
private static final class NoopDoubleValueRecorder implements DoubleValueRecorder {
private NoopDoubleValueRecorder() {}
@Override
public void record(double value, Labels labels) {
Objects.requireNonNull(labels, "labels");
}
@Override
public void record(double value) {
record(value, Labels.empty());
}
@Override
public NoopBoundDoubleValueRecorder bind(Labels labels) {
Objects.requireNonNull(labels, "labels");
return NoopBoundDoubleValueRecorder.INSTANCE;
}
@Immutable
private enum NoopBoundDoubleValueRecorder implements BoundDoubleValueRecorder {
INSTANCE;
@Override
public void record(double value) {}
@Override
public void unbind() {}
}
private static final class NoopBuilder extends NoopAbstractInstrumentBuilder<NoopBuilder>
implements Builder {
@Override
protected NoopBuilder getThis() {
return this;
}
@Override
public DoubleValueRecorder build() {
return new NoopDoubleValueRecorder();
}
}
}
/** No-op implementation of {@link LongValueRecorder} interface. */
@Immutable
private static final class NoopLongValueRecorder implements LongValueRecorder {
private NoopLongValueRecorder() {}
@Override
public void record(long value, Labels labels) {
Objects.requireNonNull(labels, "labels");
}
@Override
public void record(long value) {
record(value, Labels.empty());
}
@Override
public NoopBoundLongValueRecorder bind(Labels labels) {
Objects.requireNonNull(labels, "labels");
return NoopBoundLongValueRecorder.INSTANCE;
}
@Immutable
private enum NoopBoundLongValueRecorder implements BoundLongValueRecorder {
INSTANCE;
@Override
public void record(long value) {}
@Override
public void unbind() {}
}
private static final class NoopBuilder extends NoopAbstractInstrumentBuilder<NoopBuilder>
implements Builder {
@Override
protected NoopBuilder getThis() {
return this;
}
@Override
public LongValueRecorder build() {
return new NoopLongValueRecorder();
}
}
}
/** No-op implementation of {@link DoubleSumObserver} interface. */
@Immutable
private static final class NoopDoubleSumObserver implements DoubleSumObserver {
private NoopDoubleSumObserver() {}
@Override
public void setCallback(Callback<DoubleResult> callback) {
Objects.requireNonNull(callback, "callback");
}
private static final class NoopBuilder extends NoopAbstractInstrumentBuilder<NoopBuilder>
implements Builder {
@Override
protected NoopBuilder getThis() {
return this;
}
@Override
public DoubleSumObserver build() {
return new NoopDoubleSumObserver();
}
}
}
/** No-op implementation of {@link LongSumObserver} interface. */
@Immutable
private static final class NoopLongSumObserver implements LongSumObserver {
private NoopLongSumObserver() {}
@Override
public void setCallback(Callback<LongResult> callback) {
Objects.requireNonNull(callback, "callback");
}
private static final class NoopBuilder extends NoopAbstractInstrumentBuilder<NoopBuilder>
implements Builder {
@Override
protected NoopBuilder getThis() {
return this;
}
@Override
public LongSumObserver build() {
return new NoopLongSumObserver();
}
}
}
/** No-op implementation of {@link DoubleUpDownSumObserver} interface. */
@Immutable
private static final class NoopDoubleUpDownSumObserver implements DoubleUpDownSumObserver {
private NoopDoubleUpDownSumObserver() {}
@Override
public void setCallback(Callback<DoubleResult> callback) {
Objects.requireNonNull(callback, "callback");
}
private static final class NoopBuilder extends NoopAbstractInstrumentBuilder<NoopBuilder>
implements Builder {
@Override
protected NoopBuilder getThis() {
return this;
}
@Override
public DoubleUpDownSumObserver build() {
return new NoopDoubleUpDownSumObserver();
}
}
}
/** No-op implementation of {@link LongUpDownSumObserver} interface. */
@Immutable
private static final class NoopLongUpDownSumObserver implements LongUpDownSumObserver {
private NoopLongUpDownSumObserver() {}
@Override
public void setCallback(Callback<LongResult> callback) {
Objects.requireNonNull(callback, "callback");
}
private static final class NoopBuilder extends NoopAbstractInstrumentBuilder<NoopBuilder>
implements Builder {
@Override
protected NoopBuilder getThis() {
return this;
}
@Override
public LongUpDownSumObserver build() {
return new NoopLongUpDownSumObserver();
}
}
}
/** No-op implementation of {@link DoubleValueObserver} interface. */
@Immutable
private static final class NoopDoubleValueObserver implements DoubleValueObserver {
private NoopDoubleValueObserver() {}
@Override
public void setCallback(Callback<DoubleResult> callback) {
Objects.requireNonNull(callback, "callback");
}
private static final class NoopBuilder extends NoopAbstractInstrumentBuilder<NoopBuilder>
implements Builder {
@Override
protected NoopBuilder getThis() {
return this;
}
@Override
public DoubleValueObserver build() {
return new NoopDoubleValueObserver();
}
}
}
/** No-op implementation of {@link LongValueObserver} interface. */
@Immutable
private static final class NoopLongValueObserver implements LongValueObserver {
private NoopLongValueObserver() {}
@Override
public void setCallback(Callback<LongResult> callback) {
Objects.requireNonNull(callback, "callback");
}
private static final class NoopBuilder extends NoopAbstractInstrumentBuilder<NoopBuilder>
implements Builder {
@Override
protected NoopBuilder getThis() {
return this;
}
@Override
public LongValueObserver build() {
return new NoopLongValueObserver();
}
}
}
/** No-op implementation of {@link BatchRecorder} interface. */
private enum NoopBatchRecorder implements BatchRecorder {
INSTANCE;
@Override
public BatchRecorder put(LongValueRecorder valueRecorder, long value) {
Objects.requireNonNull(valueRecorder, "valueRecorder");
return this;
}
@Override
public BatchRecorder put(DoubleValueRecorder valueRecorder, double value) {
Objects.requireNonNull(valueRecorder, "valueRecorder");
return this;
}
@Override
public BatchRecorder put(LongCounter counter, long value) {
Objects.requireNonNull(counter, "counter");
Utils.checkArgument(value >= 0, COUNTERS_CAN_ONLY_INCREASE);
return this;
}
@Override
public BatchRecorder put(DoubleCounter counter, double value) {
Objects.requireNonNull(counter, "counter");
Utils.checkArgument(value >= 0.0, COUNTERS_CAN_ONLY_INCREASE);
return this;
}
@Override
public BatchRecorder put(LongUpDownCounter upDownCounter, long value) {
Objects.requireNonNull(upDownCounter, "upDownCounter");
return this;
}
@Override
public BatchRecorder put(DoubleUpDownCounter upDownCounter, double value) {
Objects.requireNonNull(upDownCounter, "upDownCounter");
return this;
}
@Override
public void record() {}
}
private abstract static class NoopAbstractInstrumentBuilder<
B extends NoopAbstractInstrumentBuilder<B>>
implements Instrument.Builder {
@Override
public B setDescription(String description) {
Objects.requireNonNull(description, "description");
return getThis();
}
@Override
public B setUnit(String unit) {
Objects.requireNonNull(unit, "unit");
return getThis();
}
protected abstract B getThis();
}
}