21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package sun.nio.ch;
27
28 import java.io.*;
29
30 /**
31 * Allows different platforms to call different native methods
32 * for read and write operations.
33 */
34
35 abstract class NativeDispatcher
36 {
37
38 abstract int read(FileDescriptor fd, long address, int len)
39 throws IOException;
40
41 /**
42 * Returns {@code true} if pread/pwrite needs to be synchronized with
43 * position sensitive methods.
44 */
45 boolean needsPositionLock() {
46 return false;
47 }
48
49 int pread(FileDescriptor fd, long address, int len, long position)
50 throws IOException
51 {
52 throw new IOException("Operation Unsupported");
53 }
54
55 abstract long readv(FileDescriptor fd, long address, int len)
56 throws IOException;
57
58 abstract int write(FileDescriptor fd, long address, int len)
59 throws IOException;
60
61 int pwrite(FileDescriptor fd, long address, int len, long position)
62 throws IOException
63 {
64 throw new IOException("Operation Unsupported");
65 }
66
67 abstract long writev(FileDescriptor fd, long address, int len)
68 throws IOException;
69
70 abstract void close(FileDescriptor fd) throws IOException;
71
72 // Prepare the given fd for closing by duping it to a known internal fd
73 // that's already closed. This is necessary on some operating systems
74 // (Solaris and Linux) to prevent fd recycling.
75 //
76 void preClose(FileDescriptor fd) throws IOException {
77 // Do nothing by default; this is only needed on Unix
78 }
79
80 }
|
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package sun.nio.ch;
27
28 import java.io.*;
29
30 /**
31 * Allows different platforms to call different native methods
32 * for read and write operations.
33 */
34
35 abstract class NativeDispatcher
36 {
37
38 abstract int read(FileDescriptor fd, long address, int len)
39 throws IOException;
40
41 int readDirect(FileDescriptor fd, long address, int len)
42 throws IOException
43 {
44 throw new IOException("Operation Unsupported");
45 }
46
47 /**
48 * Returns {@code true} if pread/pwrite needs to be synchronized with
49 * position sensitive methods.
50 */
51 boolean needsPositionLock() {
52 return false;
53 }
54
55 int pread(FileDescriptor fd, long address, int len, long position)
56 throws IOException
57 {
58 throw new IOException("Operation Unsupported");
59 }
60
61 int preadDirect(FileDescriptor fd, long address, int len, long position)
62 throws IOException
63 {
64 throw new IOException("Operation Unsupported");
65 }
66
67 abstract long readv(FileDescriptor fd, long address, int len)
68 throws IOException;
69
70 long readvDirect(FileDescriptor fd, long address, int len)
71 throws IOException
72 {
73 throw new IOException("Operation Unsupported");
74 }
75
76 abstract int write(FileDescriptor fd, long address, int len)
77 throws IOException;
78
79 int writeDirect(FileDescriptor fd, long address, int len)
80 throws IOException
81 {
82 throw new IOException("Operation Unsupported");
83 }
84
85 int pwrite(FileDescriptor fd, long address, int len, long position)
86 throws IOException
87 {
88 throw new IOException("Operation Unsupported");
89 }
90
91 int pwriteDirect(FileDescriptor fd, long address, int len, long position)
92 throws IOException
93 {
94 throw new IOException("Operation Unsupported");
95 }
96
97 abstract long writev(FileDescriptor fd, long address, int len)
98 throws IOException;
99
100 long writevDirect(FileDescriptor fd, long address, int len)
101 throws IOException
102 {
103 throw new IOException("Operation Unsupported");
104 }
105
106 abstract void close(FileDescriptor fd) throws IOException;
107
108 // Prepare the given fd for closing by duping it to a known internal fd
109 // that's already closed. This is necessary on some operating systems
110 // (Solaris and Linux) to prevent fd recycling.
111 //
112 void preClose(FileDescriptor fd) throws IOException {
113 // Do nothing by default; this is only needed on Unix
114 }
115
116 }
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