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   源码介绍

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Index
Index ii
Preface xiii
How to Use this Book xiii
Code Examples xiv
Acknowledgments xv
Chapter 1 - Introduction
1
1.1. A (Very) Brief History of Concurrency
2
1.2. Benefits of Threads
3
1.2.1. Exploiting Multiple Processors
3
1.2.2. Simplicity of Modeling
3
1.2.3. Simplified Handling of Asynchronous Events
3
1.2.4. More Responsive User Interfaces
4
1.3. Risks of Threads
5
1.3.1. Safety Hazards
5
1.3.2. Liveness Hazards
6
1.3.3. Performance Hazards
6
1.4. Threads are Everywhere
8
Part I: Fundamentals 10
Chapter 2. Thread Safety 11
2.1. What is Thread Safety? 12
2.2. Atomicity 13
2.3. Locking 16
2.4. Guardin
g State with Locks 19
2.5. Liveness and Performance 20
Chapter 3. Sharing Objects 23
3.1. Visibility 23
3.2. Publication and Escape 26
3.3. Thread Confinement 28
3.4. Immutability 31
3.5. Safe Publication 33
Chapter 4. Composing Objects 37
4.1. Designin
g
a Thread
‐safe Class 37
4.2. Instance Confinement 39
4.3. Delegating Thread Safety 41
4.4. Adding
Functionality to Existing Thread
‐safe Classes 47
4.5. Documenting Synchronization Policies 49
Chapter 5. Building Blocks 51
5.1. Synchronized Collections 51
5.2. Concurrent Collections 54
5.3. Blocking Queues an
d the Producer
‐consumer Pattern 56
5.4. Blocking and Interruptible Methods 59
5.5. Synchronizers 60
5.6. Building an Efficient, Scalable Result Cache 64
Summary of Part
I 69
<Index iii
Part II: Structuring Concurrent Applications 71
Chapter 6. Task Execution 72
6.1. Executing Tasks in Threads 72
6.2. Th
e Executor Framework 74
6.3. Finding Exploitable Parallelism 78
Summary 83
Chapter 7. Cancellation and Shutdown 85
7.1. Task Cancellation 85
7.2. Stopping
a Thread
‐based Service 93
7.3. Handling Abnormal Thread Termination 100
7.4. JVM Shutdown 102
Summary 103
Chapter 8. Applying Thread Pools 104
8.1. Implicit Couplings Between Tasks and Execution Policies 104
8.2. Sizing Thread Pools 105
8.3. Configuring ThreadPoolExecutor 106
8.4. Extending ThreadPoolExecutor 111
8.5. Parallelizing Recursive Algorithms 112
Summary 116
Chapter 9. GUI Applications 117
9.1. Why are GUI
s Single
‐threaded? 117
9.2. Short
‐
running GUI Tasks 119
9.3. Long
‐running GU
I Tasks 121
9.4. Shared Data Models 123
9.5. Other Forms of Single
‐threaded Subsystems 125
Summary 126
Part III: Liveness, Performance, and Testing 127
Chapter 10. Avoiding Liveness Hazards 128
10.1. Deadlock 128
10.2. Avoiding and Diagnosing Deadlocks 133
10.3. Other Liveness Hazards 135
Summary 136
Chapter 11. Performance and Scalability 137
11.1. Thinking about Performance 137
11.2. Amdahl's Law 139
11.3. Costs
Introduced by Threads 142
11.4. Reducing Lock Contention 144
11.5. Example: Comparing Map Performance 150
11.6. Reducing Context Switch Overhead 151
Summary 152
Chapter 12. Testing Concurrent Programs 153
12.1. Testing for Correctness 153
12.2. Testing for Performance 160
12.3. Avoiding Performanc
e Testing Pitfalls 165
12.4. Complementary Testing Approaches 167
Summary 169
Part IV: Advanced Topics 170
Chapter 13 - Explicit Locks 171
13.1. Lock an
d ReentrantLock 171
13.2. Performance Considerations 174
13.3. Fairness 175
iv Java Concurrency In Practice
13.4. Choosing Between Synchronized and ReentrantLock 176
13.5. Read‐write Locks 176
Summary 178
Chapter 14 - Building Custom Synchronizers 179
14.1. Managing State Dependence 179
14.2. Using Condition Queues 183
14.3. Explicit Condition Objects 188
14.4. Anatomy of a Synchronizer 189
14.5. AbstractQueuedSynchronizer 190
14.6. AQS in Java.util.concurrent Synchronizer Classes 192
Summary 194
Chapter 15. Atomic Variables and Non-blocking Synchronization 195
15.1. Disadvantages of Locking 195
15.2. Hardware Support for Concurrency 196
15.3. Atomic Variable Classes 198
15.4. Non‐blocking Algorithms 201
Summary 206
Chapter 16. The Java Memory Model 207
16.1. What is a Memory Model, and Why would I Want One? 207
16.2. Publication 211
Summary 215
Appendix A. Annotations for Concurrency 216
A.1. Class Annotations 216
A.2. Field and Method Annotations 216
Bibliography 217