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projects/core/src/main/java/dan200/computercraft/core/metrics/ThreadAllocations.java
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| // SPDX-FileCopyrightText: 2023 The CC: Tweaked Developers | ||
| // | ||
| // SPDX-License-Identifier: MPL-2.0 | ||
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| package dan200.computercraft.core.metrics; | ||
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| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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| import javax.annotation.Nullable; | ||
| import java.lang.invoke.MethodHandle; | ||
| import java.lang.invoke.MethodHandles; | ||
| import java.lang.invoke.MethodType; | ||
| import java.lang.management.ManagementFactory; | ||
| import java.lang.management.ThreadMXBean; | ||
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| /** | ||
| * Provides a way to get the memory allocated by a specific thread. | ||
| * <p> | ||
| * This uses Hotspot-specific functionality, so may not be available on all JVMs. Consumers should call | ||
| * {@link #isSupported()} before calling more specific methods. | ||
| * | ||
| * @see com.sun.management.ThreadMXBean | ||
| */ | ||
| public final class ThreadAllocations { | ||
| private static final Logger LOG = LoggerFactory.getLogger(ThreadAllocations.class); | ||
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| private static final @Nullable MethodHandle threadAllocatedBytes; | ||
| private static final @Nullable MethodHandle threadsAllocatedBytes; | ||
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| static { | ||
| MethodHandle threadAllocatedBytesHandle, threadsAllocatedBytesHandle; | ||
| try { | ||
| var threadMxBean = Class.forName("com.sun.management.ThreadMXBean").asSubclass(ThreadMXBean.class); | ||
| var bean = ManagementFactory.getPlatformMXBean(threadMxBean); | ||
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| // Enable allocation tracking. | ||
| threadMxBean.getMethod("setThreadAllocatedMemoryEnabled", boolean.class).invoke(bean, true); | ||
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| // Just probe this method once to check it doesn't error. | ||
| threadMxBean.getMethod("getCurrentThreadAllocatedBytes").invoke(bean); | ||
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| threadAllocatedBytesHandle = MethodHandles.publicLookup() | ||
| .findVirtual(threadMxBean, "getThreadAllocatedBytes", MethodType.methodType(long.class, long.class)) | ||
| .bindTo(bean); | ||
| threadsAllocatedBytesHandle = MethodHandles.publicLookup() | ||
| .findVirtual(threadMxBean, "getThreadAllocatedBytes", MethodType.methodType(long[].class, long[].class)) | ||
| .bindTo(bean); | ||
| } catch (LinkageError | ReflectiveOperationException | RuntimeException e) { | ||
| LOG.warn("Cannot track allocated memory of computer threads", e); | ||
| threadAllocatedBytesHandle = threadsAllocatedBytesHandle = null; | ||
| } | ||
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| threadAllocatedBytes = threadAllocatedBytesHandle; | ||
| threadsAllocatedBytes = threadsAllocatedBytesHandle; | ||
| } | ||
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| private ThreadAllocations() { | ||
| } | ||
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| /** | ||
| * Check whether the current JVM provides information about per-thread allocations. | ||
| * | ||
| * @return Whether per-thread allocation information is available. | ||
| */ | ||
| public static boolean isSupported() { | ||
| return threadAllocatedBytes != null; | ||
| } | ||
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| /** | ||
| * Get an approximation the amount of memory a thread has allocated over its lifetime. | ||
| * | ||
| * @param threadId The ID of the thread. | ||
| * @return The allocated memory, in bytes. | ||
| * @see com.sun.management.ThreadMXBean#getThreadAllocatedBytes(long) | ||
| */ | ||
| public static long getAllocatedBytes(long threadId) { | ||
| if (threadAllocatedBytes == null) { | ||
| throw new UnsupportedOperationException("Allocated bytes are not supported"); | ||
| } | ||
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| try { | ||
| return (long) threadAllocatedBytes.invokeExact(threadId); | ||
| } catch (Throwable t) { | ||
| throw throwUnchecked0(t); // Should never occur, but if it does it's guaranteed to be a runtime exception. | ||
| } | ||
| } | ||
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| /** | ||
| * Get an approximation the amount of memory a thread has allocated over its lifetime. | ||
| * <p> | ||
| * This is equivalent to calling {@link #getAllocatedBytes(long)} for each thread in {@code threadIds}. | ||
| * | ||
| * @param threadIds An array of thread IDs. | ||
| * @return An array with the same length as {@code threadIds}, containing the allocated memory for each thread. | ||
| * @see com.sun.management.ThreadMXBean#getThreadAllocatedBytes(long[]) | ||
| */ | ||
| public static long[] getAllocatedBytes(long[] threadIds) { | ||
| if (threadsAllocatedBytes == null) { | ||
| throw new UnsupportedOperationException("Allocated bytes are not supported"); | ||
| } | ||
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| try { | ||
| return (long[]) threadsAllocatedBytes.invokeExact(threadIds); | ||
| } catch (Throwable t) { | ||
| throw throwUnchecked0(t); // Should never occur, but if it does it's guaranteed to be a runtime exception. | ||
| } | ||
| } | ||
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| @SuppressWarnings({ "unchecked", "TypeParameterUnusedInFormals" }) | ||
| private static <T extends Throwable> T throwUnchecked0(Throwable t) throws T { | ||
| throw (T) t; | ||
| } | ||
| } |
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