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35 changes: 35 additions & 0 deletions
35
core/src/main/java/com/datastax/oss/driver/api/core/RequestThrottlingException.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,35 @@ | ||
| /* | ||
| * Copyright DataStax, Inc. | ||
| * | ||
| * Licensed 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 | ||
| * | ||
| * http://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 com.datastax.oss.driver.api.core; | ||
|
|
||
| /** | ||
| * Thrown if the session uses a request throttler, and it didn't allow the current request to | ||
| * execute. | ||
| * | ||
| * <p>This can happen either when the session is overloaded, or at shutdown for requests that had | ||
| * been enqueued. | ||
| */ | ||
| public class RequestThrottlingException extends DriverException { | ||
|
|
||
| public RequestThrottlingException(String message) { | ||
| super(message, null, true); | ||
| } | ||
|
|
||
| @Override | ||
| public DriverException copy() { | ||
| return new RequestThrottlingException(getMessage()); | ||
| } | ||
| } |
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98 changes: 98 additions & 0 deletions
98
...java/com/datastax/oss/driver/internal/core/adminrequest/ThrottledAdminRequestHandler.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| /* | ||
| * Copyright DataStax, Inc. | ||
| * | ||
| * Licensed 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 | ||
| * | ||
| * http://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 com.datastax.oss.driver.internal.core.adminrequest; | ||
|
|
||
| import com.datastax.oss.driver.api.core.DriverTimeoutException; | ||
| import com.datastax.oss.driver.api.core.RequestThrottlingException; | ||
| import com.datastax.oss.driver.api.core.metrics.DefaultSessionMetric; | ||
| import com.datastax.oss.driver.internal.core.channel.DriverChannel; | ||
| import com.datastax.oss.driver.internal.core.metrics.SessionMetricUpdater; | ||
| import com.datastax.oss.driver.internal.core.session.throttling.RequestThrottler; | ||
| import com.datastax.oss.driver.internal.core.session.throttling.Throttled; | ||
| import com.datastax.oss.protocol.internal.Message; | ||
| import java.nio.ByteBuffer; | ||
| import java.time.Duration; | ||
| import java.util.Map; | ||
| import java.util.concurrent.CompletionStage; | ||
| import java.util.concurrent.TimeUnit; | ||
|
|
||
| public class ThrottledAdminRequestHandler extends AdminRequestHandler implements Throttled { | ||
|
|
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| private final long startTimeNanos; | ||
| private final RequestThrottler throttler; | ||
| private final SessionMetricUpdater metricUpdater; | ||
|
|
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| public ThrottledAdminRequestHandler( | ||
| DriverChannel channel, | ||
| Message message, | ||
| Map<String, ByteBuffer> customPayload, | ||
| Duration timeout, | ||
| RequestThrottler throttler, | ||
| SessionMetricUpdater metricUpdater, | ||
| String logPrefix, | ||
| String debugString) { | ||
| super(channel, message, customPayload, timeout, logPrefix, debugString); | ||
| this.startTimeNanos = System.nanoTime(); | ||
| this.throttler = throttler; | ||
| this.metricUpdater = metricUpdater; | ||
| } | ||
|
|
||
| @Override | ||
| public CompletionStage<AdminResult> start() { | ||
| // Don't write request yet, wait for green light from throttler | ||
| throttler.register(this); | ||
| return result; | ||
| } | ||
|
|
||
| @Override | ||
| public void onThrottleReady(boolean wasDelayed) { | ||
| if (wasDelayed) { | ||
| metricUpdater.updateTimer( | ||
| DefaultSessionMetric.THROTTLING_DELAY, | ||
| System.nanoTime() - startTimeNanos, | ||
| TimeUnit.NANOSECONDS); | ||
| } | ||
| super.start(); | ||
| } | ||
|
|
||
| @Override | ||
| public void onThrottleFailure(RequestThrottlingException error) { | ||
| metricUpdater.incrementCounter(DefaultSessionMetric.THROTTLING_ERRORS); | ||
| setFinalError(error); | ||
| } | ||
|
|
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| @Override | ||
| protected boolean setFinalResult(AdminResult result) { | ||
| boolean wasSet = super.setFinalResult(result); | ||
| if (wasSet) { | ||
| throttler.signalSuccess(this); | ||
| } | ||
| return wasSet; | ||
| } | ||
|
|
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| @Override | ||
| protected boolean setFinalError(Throwable error) { | ||
| boolean wasSet = super.setFinalError(error); | ||
| if (wasSet) { | ||
| if (error instanceof DriverTimeoutException) { | ||
| throttler.signalTimeout(this); | ||
| } else if (!(error instanceof RequestThrottlingException)) { | ||
| throttler.signalError(this, error); | ||
| } | ||
| } | ||
| return wasSet; | ||
| } | ||
| } |
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