Confinement Within Threads in Java

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Thread-based confinement techniques [5] extend those for method sequences In fact, the simplest and often best technique is to use a thread-per-session design (see 41) that is otherwise identical to session-based confinement For example, you can initialize hand-offs in the base of a run method:
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Even though this section presupposes only knowledge of the basic Thread usages presented in 1, you may find a cursory glance through 4 helpful
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class ThreadPerSessionBasedService { // fragments // public void service() { Runnable r = new Runnable() { public void run() { OutputStream output = null; try { output = new FileOutputStream(""); doService(output); } catch (IOException e) { handleIOFailure(); } finally { try { if (output != null) outputclose(); } catch (IOException ignore) {} } } }; new Thread(r)start(); } void doService(OutputStream s) throws IOException { swrite(); // possibly more hand-offs } }
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Some approaches to concurrent software design (such as CSP see 451) arrange or require that all fields accessible within a thread be strictly confined to that thread This mimics the enforced isolation of address spaces seen in process versus thread based concurrent programming (see 122) However, note that it is generally impossible to confine access to every object used in a given thread All threads running on a given JVM must ultimately share access to at least some underlying resources, for example those controlled via methods in the javalangSystem class 2321 Thread-specific fields In addition to receiving confined references along call chains, the method invocations executing within a single thread can access the Thread object representing the thread they are running in, and any further information traversable from there The static method ThreadcurrentThread() can be called from any method and returns the Thread object of the caller You can exploit this by adding fields to Thread subclasses and supplying methods to access them only from within the current thread For example:
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class ThreadWithOutputStream extends Thread {
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private OutputStream output; ThreadWithOutputStream(Runnable r, OutputStream s) { super(r); output = s; } static ThreadWithOutputStream current() throws ClassCastException { return (ThreadWithOutputStream) (currentThread()); } static OutputStream getOutput() { return current()output; } static void setOutput(OutputStream s) { current()output = s;} }
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This class could be used, for example, in:
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class ServiceUsingThreadWithOutputStream { // Fragments // public void service() throws IOException { OutputStream output = new FileOutputStream(""); Runnable r = new Runnable() { public void run() { try { doService(); } catch (IOException e) { } } }; new ThreadWithOutputStream(r, output)start(); } void doService() throws IOException { ThreadWithOutputStreamcurrent()getOutput()write(); // } }
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2322 ThreadLocal The javalangThreadLocal utility class removes one obstacle to using thread-specific techniques, their reliance on special Thread subclasses This class allows thread-specific variables to be added in an ad-hoc fashion to just about any code The ThreadLocal class internally maintains a table associating data (Object references) with Thread instances ThreadLocal supports set and get methods to access data held by the current Thread The javalangInheritableThreadLocal class extends ThreadLocal to automatically propagate per-thread variables to any threads that are in turn created by the current thread
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Most designs employing ThreadLocal may be seen as extensions of the Singleton (see 224) pattern Rather than constructing one instance of a resource per program, most applications of ThreadLocals construct one instance per thread ThreadLocal variables are normally declared as static, and usually have package-scoped visibility so they may be accessed by any of a set of methods running in a given thread A ThreadLocal could be used in our running example as follows:
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class ServiceUsingThreadLocal { // Fragments static ThreadLocal output = new ThreadLocal(); public void service() { try { final OutputStream s = new FileOutputStream(""); Runnable r = new Runnable() { public void run() { outputset(s); try { doService(); } catch (IOException e) { } finally { try { sclose(); } catch (IOException ignore) {} } } }; new Thread(r)start(); } catch (IOException e) { } } void doService() throws IOException { ((OutputStream)(outputget()))write(); // } }
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