我是Java 8中的tap的新手，我想知道当我将结果设置为回调中的类成员属性并尝试在{{1之后读取它们时，以下代码片段是否是线程安全的？ }}，为什么？
CompletableFuture答案 0 :(得分：1)
[
{
"employees": [
{
"jobFamilyLevel": "spm",
"addresses": [
{
"city": "Tioga",
"country": "France, Metropolitan",
"zipCode": 8655,
"line1": "229",
"line2": "Kenmore Terrace",
"landmark": "Delaware",
"type": "<SyntaxError: Invalid or unexpected token>"
}
],
"id": "e5b4cdfc-cfe5-4dcc-bd4a-813c068dc61c",
"designation": "Simon",
"name": "Norman"
},
{
"jobFamilyLevel": "lead",
"addresses": [
{
"city": "Marienthal",
"country": "Cote D'Ivoire (Ivory Coast)",
"zipCode": 1123,
"line1": "660",
"line2": "Withers Street",
"landmark": "Alaska",
"type": "<SyntaxError: Invalid or unexpected token>"
}
],
"id": "8dfe3cd5-a457-4810-8c61-8fb0fc09613d",
"designation": "Baldwin",
"name": "England"
},
{
"jobFamilyLevel": "avp",
"addresses": [
{
"city": "Calverton",
"country": "Mauritius",
"zipCode": 8144,
"line1": "460",
"line2": "Monroe Street",
"landmark": "Arizona",
"type": "<SyntaxError: Invalid or unexpected token>"
}
],
"id": "bb34a0aa-823a-40e6-9e68-5b8db9bb269a",
"designation": "Hawkins",
"name": "Wooten"
},
{
"jobFamilyLevel": "lead",
"addresses": [
{
"city": "Juntura",
"country": "Malaysia",
"zipCode": 6173,
"line1": "710",
"line2": "Matthews Place",
"landmark": "South Dakota",
"type": "<SyntaxError: Invalid or unexpected token>"
}
],
"id": "685c09e9-ec4c-4f38-b5dd-2e1b9d098543",
"designation": "Short",
"name": "Roach"
}
],
"name": "Patsy",
"description": "abc"
},
{
"employees": [
{
"jobFamilyLevel": "avp",
"addresses": [
{
"city": "Trinway",
"country": "Chad",
"zipCode": 6640,
"line1": "180",
"line2": "Bleecker Street",
"landmark": "Guam",
"type": "<SyntaxError: Invalid or unexpected token>"
}
],
"id": "c7c1dfb3-2c19-4a16-aadb-2161cbba5034",
"designation": "Ballard",
"name": "Stuart"
},
{
"jobFamilyLevel": "lead",
"addresses": [
{
"city": "Riviera",
"country": "Belarus",
"zipCode": 6868,
"line1": "604",
"line2": "Abbey Court",
"landmark": "Rhode Island",
"type": "<SyntaxError: Invalid or unexpected token>"
}
],
"id": "3e0a6192-5bd5-4ffc-92ef-21882c7a992d",
"designation": "Hoffman",
"name": "Stone"
},
{
"jobFamilyLevel": "trainee",
"addresses": [
{
"city": "Elwood",
"country": "Paraguay",
"zipCode": 3457,
"line1": "822",
"line2": "Greenwood Avenue",
"landmark": "Palau",
"type": "<SyntaxError: Invalid or unexpected token>"
}
],
"id": "c28c8a4f-ccfb-405f-98f9-bb5b6602939a",
"designation": "Chase",
"name": "Craft"
},
{
"jobFamilyLevel": "pm",
"addresses": [
{
"city": "Cliffside",
"country": "Gambia",
"zipCode": 5404,
"line1": "534",
"line2": "Eagle Street",
"landmark": "Montana",
"type": "<SyntaxError: Invalid or unexpected token>"
}
],
"id": "996e0c9e-73e7-4d41-9c43-8eff4dbe0d6d",
"designation": "Ray",
"name": "Meyers"
}
],
"name": "Mable",
"description": "abc"
}
]
软件包中定义的Memory Consistency Properties涵盖了您的问题：
Chapter 17 of the Java Language Specification定义了 内存操作（例如共享变量的读取和写入）上的 happens-before 关系。 一个线程写入的结果是 仅在写入时保证对另一个线程的读取可见 操作发生在之前。 […]
SELECT * FROM organization where ?::text IN (SELECT jsonb_array_elements(jsonb_array_elements(info -> 'departments') -> 'employees') ->> 'jobFamilyLevel')中所有类的方法及其 子程序包将这些保证扩展到更高级别的同步。 特别是：
- […]
- 由
java.util.concurrenthappen-before 动作代表的异步计算所采取的动作，这些动作是在检索到 通过java.util.concurrent在另一个线程中得到结果。- […]
因此，总而言之，您的Future调用保证了在线程执行之后，您的写入将对线程可见。