JsonEventLog.java

net.minecraft.util.eventlog.JsonEventLog

信息

• 全限定名：net.minecraft.util.eventlog.JsonEventLog
• 类型：public class
• 包：net.minecraft.util.eventlog
• 源码路径：src/main/java/net/minecraft/util/eventlog/JsonEventLog.java
• 起始行号：L19
• 实现：Closeable
• 职责：

  TODO

字段/常量

• GSON

  • 类型: Gson
  • 修饰符: private static final
  • 源码定位: L20
  • 说明:

    TODO

• codec

  • 类型: Codec<T>
  • 修饰符: private final
  • 源码定位: L21
  • 说明:

    TODO

• channel

  • 类型: FileChannel
  • 修饰符: private final
  • 源码定位: L22
  • 说明:

    TODO

• referenceCount

  • 类型: AtomicInteger
  • 修饰符: private final
  • 源码定位: L23
  • 说明:

    TODO

内部类/嵌套类型

• 无

构造器

public JsonEventLog(Codec<T> codec, FileChannel channel) @ L25

• 构造器名：JsonEventLog
• 源码定位：L25
• 修饰符：public

参数:

• codec: Codec
• channel: FileChannel

说明:

TODO

方法

下面的方法块按源码顺序生成。

public static <T> JsonEventLog<T> open(Codec<T> codec, Path path) @ L30

• 方法名：open
• 源码定位：L30
• 返回类型： JsonEventLog
• 修饰符：public static

参数:

• codec: Codec
• path: Path

说明:

TODO

public void write(T event) @ L35

• 方法名：write
• 源码定位：L35
• 返回类型：void
• 修饰符：public

参数:

• event: T

说明:

TODO

public JsonEventLogReader<T> openReader() @ L44

• 方法名：openReader
• 源码定位：L44
• 返回类型：JsonEventLogReader
• 修饰符：public

参数:

• 无

说明:

TODO

public void close() @ L78

• 方法名：close
• 源码定位：L78
• 返回类型：void
• 修饰符：public

参数:

• 无

说明:

TODO

private void releaseReference() @ L83

• 方法名：releaseReference
• 源码定位：L83
• 返回类型：void
• 修饰符：private

参数:

• 无

说明:

TODO

代码

public class JsonEventLog<T> implements Closeable {
    private static final Gson GSON = new Gson();
    private final Codec<T> codec;
    private final FileChannel channel;
    private final AtomicInteger referenceCount = new AtomicInteger(1);
 
    public JsonEventLog(Codec<T> codec, FileChannel channel) {
        this.codec = codec;
        this.channel = channel;
    }
 
    public static <T> JsonEventLog<T> open(Codec<T> codec, Path path) throws IOException {
        FileChannel channel = FileChannel.open(path, StandardOpenOption.WRITE, StandardOpenOption.READ, StandardOpenOption.CREATE);
        return new JsonEventLog<>(codec, channel);
    }
 
    public void write(T event) throws IOException {
        JsonElement json = this.codec.encodeStart(JsonOps.INSTANCE, event).getOrThrow(IOException::new);
        this.channel.position(this.channel.size());
        Writer writer = Channels.newWriter(this.channel, StandardCharsets.UTF_8);
        GSON.toJson(json, GSON.newJsonWriter(writer));
        writer.write(10);
        writer.flush();
    }
 
    public JsonEventLogReader<T> openReader() throws IOException {
        if (this.referenceCount.get() <= 0) {
            throw new IOException("Event log has already been closed");
        } else {
            this.referenceCount.incrementAndGet();
            final JsonEventLogReader<T> reader = JsonEventLogReader.create(this.codec, Channels.newReader(this.channel, StandardCharsets.UTF_8));
            return new JsonEventLogReader<T>() {
                private volatile long position;
 
                {
                    Objects.requireNonNull(JsonEventLog.this);
                }
 
                @Override
                public @Nullable T next() throws IOException {
                    Object var1;
                    try {
                        JsonEventLog.this.channel.position(this.position);
                        var1 = reader.next();
                    } finally {
                        this.position = JsonEventLog.this.channel.position();
                    }
 
                    return (T)var1;
                }
 
                @Override
                public void close() throws IOException {
                    JsonEventLog.this.releaseReference();
                }
            };
        }
    }
 
    @Override
    public void close() throws IOException {
        this.releaseReference();
    }
 
    private void releaseReference() throws IOException {
        if (this.referenceCount.decrementAndGet() <= 0) {
            this.channel.close();
        }
    }
}

引用的其他类

• JsonEventLogReader
  • 引用位置: 方法调用/返回值
  • 关联成员: JsonEventLogReader.create()