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...loudfoundry/multiapps/controller/core/application/health/ApplicationHealthCalculator.java
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| package org.cloudfoundry.multiapps.controller.core.application.health; | ||
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|
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| import java.text.MessageFormat; | ||
| import java.time.Duration; | ||
| import java.util.List; | ||
| import java.util.concurrent.Callable; | ||
| import java.util.concurrent.ExecutorService; | ||
| import java.util.concurrent.Executors; | ||
| import java.util.concurrent.Future; | ||
| import java.util.concurrent.ScheduledExecutorService; | ||
| import java.util.concurrent.TimeUnit; | ||
| import java.util.function.Consumer; | ||
| import java.util.function.Supplier; | ||
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|
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| import org.cloudfoundry.multiapps.controller.client.util.ResilientOperationExecutor; | ||
| import org.cloudfoundry.multiapps.controller.core.Messages; | ||
| import org.cloudfoundry.multiapps.controller.core.application.health.database.DatabaseWaitingLocksAnalyzer; | ||
| import org.cloudfoundry.multiapps.controller.core.application.health.model.ApplicationHealthResult; | ||
| import org.cloudfoundry.multiapps.controller.core.application.health.model.ImmutableApplicationHealthResult; | ||
| import org.cloudfoundry.multiapps.controller.core.model.CachedObject; | ||
| import org.cloudfoundry.multiapps.controller.core.util.ApplicationConfiguration; | ||
| import org.cloudfoundry.multiapps.controller.core.util.ApplicationInstanceNameUtil; | ||
| import org.cloudfoundry.multiapps.controller.persistence.services.DatabaseHealthService; | ||
| import org.cloudfoundry.multiapps.controller.persistence.services.DatabaseMonitoringService; | ||
| import org.cloudfoundry.multiapps.controller.persistence.services.ObjectStoreFileStorage; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
| import org.springframework.beans.factory.annotation.Autowired; | ||
| import org.springframework.http.HttpStatus; | ||
| import org.springframework.http.ResponseEntity; | ||
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|
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| import jakarta.inject.Named; | ||
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| @Named | ||
| public class ApplicationHealthCalculator { | ||
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| private static final Logger LOGGER = LoggerFactory.getLogger(ApplicationHealthCalculator.class); | ||
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| private static final int UPDATE_HEALTH_CHECK_STATUS_PERIOD_IN_SECONDS = 10; | ||
| private static final int TIMEOUT_FOR_TASK_EXECUTION_IN_SECONDS = 50; | ||
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| private final ObjectStoreFileStorage objectStoreFileStorage; | ||
| private final ApplicationConfiguration applicationConfiguration; | ||
| private final DatabaseHealthService databaseHealthService; | ||
| private final DatabaseMonitoringService databaseMonitoringService; | ||
| private final DatabaseWaitingLocksAnalyzer databaseWaitingLocksAnalyzer; | ||
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| private final CachedObject<Boolean> objectStoreFileStorageHealthCache = new CachedObject<>(Duration.ofMinutes(1)); | ||
| private final CachedObject<Boolean> dbHealthServiceCache = new CachedObject<>(Duration.ofMinutes(1)); | ||
| private final CachedObject<Boolean> hasIncreasedLocksCache = new CachedObject<>(false, Duration.ofMinutes(1)); | ||
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|
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| private final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1); | ||
| private final ExecutorService executor = Executors.newFixedThreadPool(3); | ||
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| private final ResilientOperationExecutor resilientOperationExecutor = getResilienceExecutor(); | ||
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| @Autowired | ||
| public ApplicationHealthCalculator(@Autowired(required = false) ObjectStoreFileStorage objectStoreFileStorage, | ||
| ApplicationConfiguration applicationConfiguration, DatabaseHealthService databaseHealthService, | ||
| DatabaseMonitoringService databaseMonitoringService, | ||
| DatabaseWaitingLocksAnalyzer databaseWaitingLocksAnalyzer) { | ||
| this.objectStoreFileStorage = objectStoreFileStorage; | ||
| this.applicationConfiguration = applicationConfiguration; | ||
| this.databaseHealthService = databaseHealthService; | ||
| this.databaseMonitoringService = databaseMonitoringService; | ||
| this.databaseWaitingLocksAnalyzer = databaseWaitingLocksAnalyzer; | ||
| scheduleRegularHealthUpdate(); | ||
| } | ||
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| protected void scheduleRegularHealthUpdate() { | ||
| scheduler.scheduleAtFixedRate(this::updateHealthStatus, 0, UPDATE_HEALTH_CHECK_STATUS_PERIOD_IN_SECONDS, TimeUnit.SECONDS); | ||
| } | ||
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| protected void updateHealthStatus() { | ||
| List<Callable<Boolean>> tasks = List.of(this::isObjectStoreFileStorageHealthy, this::isDatabaseHealthy, | ||
| databaseWaitingLocksAnalyzer::hasIncreasedDbLocks); | ||
| try { | ||
| List<Future<Boolean>> completedFutures = executor.invokeAll(tasks, TIMEOUT_FOR_TASK_EXECUTION_IN_SECONDS, TimeUnit.SECONDS); | ||
| executeFuture(completedFutures.get(0), isHealthy -> objectStoreFileStorageHealthCache.refresh(() -> isHealthy), false, | ||
| Messages.ERROR_OCCURRED_DURING_OBJECT_STORE_HEALTH_CHECKING); | ||
| executeFuture(completedFutures.get(1), isHealthy -> dbHealthServiceCache.refresh(() -> isHealthy), false, | ||
| Messages.ERROR_OCCURRED_DURING_DATABASE_HEALTH_CHECKING); | ||
| executeFuture(completedFutures.get(2), hasIncreasedLocks -> hasIncreasedLocksCache.refresh(() -> hasIncreasedLocks), true, | ||
| Messages.ERROR_OCCURRED_WHILE_CHECKING_FOR_INCREASED_LOCKS); | ||
| } catch (InterruptedException e) { | ||
| Thread.currentThread() | ||
| .interrupt(); | ||
| LOGGER.error(Messages.THREAD_WAS_INTERRUPTED_WHILE_WAITING_FOR_THE_RESULT_OF_A_FUTURE, e); | ||
| dbHealthServiceCache.refresh(() -> false); | ||
| objectStoreFileStorageHealthCache.refresh(() -> false); | ||
| hasIncreasedLocksCache.refresh(() -> false); | ||
| } | ||
| } | ||
|
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| private void executeFuture(Future<Boolean> future, Consumer<Boolean> consumer, boolean onErrorValue, String errorMessage) { | ||
| try { | ||
| Boolean result = future.get(); | ||
| consumer.accept(result); | ||
| } catch (InterruptedException e) { | ||
| Thread.currentThread() | ||
| .interrupt(); | ||
| LOGGER.error(Messages.THREAD_WAS_INTERRUPTED_WHILE_WAITING_FOR_THE_RESULT_OF_A_FUTURE, e); | ||
| consumer.accept(onErrorValue); | ||
| } catch (Exception e) { | ||
| LOGGER.error(MessageFormat.format(Messages.ERROR_OCCURRED_DURING_HEALTH_CHECKING_FOR_INSTANCE_0_MESSAGE_1, | ||
| applicationConfiguration.getApplicationInstanceIndex(), errorMessage), | ||
| e); | ||
| consumer.accept(onErrorValue); | ||
| } | ||
| } | ||
|
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| public ResponseEntity<ApplicationHealthResult> calculateApplicationHealth() { | ||
| if (!applicationConfiguration.isHealthCheckEnabled()) { | ||
| return ResponseEntity.ok(ImmutableApplicationHealthResult.builder() | ||
| .status(ApplicationHealthResult.Status.UP) | ||
| .hasIncreasedLocks(false) | ||
| .build()); | ||
| } | ||
| boolean isObjectStoreFileStorageHealthy = objectStoreFileStorageHealthCache.getOrRefresh(() -> false); | ||
| boolean isDbHealthy = dbHealthServiceCache.getOrRefresh(() -> false); | ||
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| if (!isObjectStoreFileStorageHealthy || !isDbHealthy) { | ||
| LOGGER.error(MessageFormat.format(Messages.OBJECT_STORE_FILE_STORAGE_HEALTH_DATABASE_HEALTH, isObjectStoreFileStorageHealthy, | ||
| isDbHealthy)); | ||
| return ResponseEntity.status(HttpStatus.SERVICE_UNAVAILABLE) | ||
| .body(ImmutableApplicationHealthResult.builder() | ||
| .status(ApplicationHealthResult.Status.DOWN) | ||
| .hasIncreasedLocks(false) | ||
| .build()); | ||
| } | ||
| boolean hasIncreasedDbLocks = hasIncreasedLocksCache.getOrRefresh(() -> true); | ||
| if (hasIncreasedDbLocks) { | ||
| LOGGER.warn(Messages.DETECTED_INCREASED_NUMBER_OF_PROCESSES_WAITING_FOR_LOCKS_FOR_INSTANCE_0_GETTING_THE_LOCKS, | ||
| applicationConfiguration.getApplicationInstanceIndex()); | ||
| long countOfProcessesWaitingForLocks = resilientOperationExecutor.execute((Supplier<Long>) () -> databaseMonitoringService.getProcessesWaitingForLocks(ApplicationInstanceNameUtil.buildApplicationInstanceTemplate(applicationConfiguration))); | ||
| LOGGER.warn(MessageFormat.format(Messages.DETECTED_INCREASED_NUMBER_OF_PROCESSES_WAITING_FOR_LOCKS_FOR_INSTANCE, | ||
| countOfProcessesWaitingForLocks, applicationConfiguration.getApplicationInstanceIndex())); | ||
| return ResponseEntity.ok(ImmutableApplicationHealthResult.builder() // TODO: Make this return 503 instead of 200 when the | ||
| // detection is trustworthy | ||
| .status(ApplicationHealthResult.Status.DOWN) | ||
| .hasIncreasedLocks(true) | ||
| .countOfProcessesWaitingForLocks(countOfProcessesWaitingForLocks) | ||
| .build()); | ||
| } | ||
| return ResponseEntity.ok(ImmutableApplicationHealthResult.builder() | ||
| .status(ApplicationHealthResult.Status.UP) | ||
| .hasIncreasedLocks(false) | ||
| .build()); | ||
| } | ||
|
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| private boolean isObjectStoreFileStorageHealthy() { | ||
| if (objectStoreFileStorage == null) { | ||
| LOGGER.debug(MessageFormat.format(Messages.OBJECT_STORE_FILE_STORAGE_IS_NOT_AVAILABLE_FOR_INSTANCE, | ||
| applicationConfiguration.getApplicationInstanceIndex())); | ||
| return true; | ||
| } | ||
| try { | ||
| resilientOperationExecutor.execute(objectStoreFileStorage::testConnection); | ||
| } catch (Exception e) { | ||
| LOGGER.error(MessageFormat.format(Messages.ERROR_OCCURRED_DURING_OBJECT_STORE_HEALTH_CHECKING_FOR_INSTANCE, | ||
| applicationConfiguration.getApplicationInstanceIndex()), | ||
| e); | ||
| return false; | ||
| } | ||
| return true; | ||
| } | ||
|
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| private boolean isDatabaseHealthy() { | ||
| try { | ||
| resilientOperationExecutor.execute(databaseHealthService::testDatabaseConnection); | ||
| return true; | ||
| } catch (Exception e) { | ||
| LOGGER.error(MessageFormat.format(Messages.ERROR_OCCURRED_WHILE_CHECKING_DATABASE_INSTANCE_0, | ||
| applicationConfiguration.getApplicationInstanceIndex()), | ||
| e); | ||
| return false; | ||
| } | ||
| } | ||
|
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| protected ResilientOperationExecutor getResilienceExecutor() { | ||
| return new ResilientOperationExecutor(); | ||
| } | ||
|
|
||
| } |
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