1. A non-transitory computer-readable medium storing instructions that, when executed by a computing device, cause the computing device to perform a method, the method comprising:
hosting at least one service;
communicatively coupling with a first end-user device;
receiving a request from the first end-user device for the at least one service;
controlling a back off period of the first end-user device by determining a retry time that is specific to the request from the first end-user device; and
relaying the retry time to the first end-user device.
2. The non-transitory computer-readable medium of claim 1, wherein the retry time is based at least on a function of an internal error rate, wherein the internal error rate is observed over a time period.
3. The non-transitory computer-readable medium of claim 2, wherein the internal error rate is associated with a number of requests that have been rejected within the time period.
4. The non-transitory computer-readable medium of claim 2, wherein the internal error rate is observed on a per service basis.
5. The non-transitory computer-readable medium of claim 1, wherein the retry time is based on a function of an error rate observed from downstream systems.
6. The non-transitory computer-readable medium of claim 1, wherein the retry time is based on a function a number of pending downstream events.
7. The non-transitory computer-readable medium of claim 1, wherein the retry time is based on a priority access associated with a user of the first end-user device.
8. The non-transitory computer-readable medium of claim 1, wherein the method further includes receiving, after the retry time has passed, the request for the at least one service resent from the first end-user device.
9. The non-transitory computer-readable medium of claim 8, wherein the method further includes processing the resent request.
10. The non-transitory computer-readable medium of claim 8, wherein the method further includes repeating the step of controlling a back off period and the step of relaying the retry time.
11. The non-transitory computer-readable medium of claim 1, wherein the method further includes receiving a request for the at least one service from a second end-user device at substantially the same time as the request for the at least one service from the first end-user device is received, wherein a retry time determined for the request from the second end-user device is different from the retry time determined for the request from the first end-user device.
12. The non-transitory computer-readable medium of claim 1, wherein the method further includes receiving a request for the at least one service from a second end-user device after receiving the request for the at least one service from the first end-user device, wherein a retry time determined for the request from the second end-user device is shorter than the retry time determined for the request from the first end-user device.
13. The non-transitory computer-readable medium of claim 1, wherein the method further includes receiving a request for the at least one service from a second end-user device after receiving the request for the at least one service from the first end-user device, wherein a retry time determined for the request from the second end-user device is longer than the retry time determined for the request from the first end-user device.
14. A non-transitory computer-readable medium storing instructions that, when executed by a computing device, cause the computing device to perform a method, the method comprising:
receiving a plurality of requests from end-user devices that are communicatively coupled with the computing device;
based on a function of an internal error rate, determining a retry time for a first subset of the end-user devices;
informing the first subset of the end-user devices of the retry time; and
processing corresponding requests from a second subset of the end-user devices.
15. The non-transitory computer-readable medium of claim 14, wherein the internal rate is observed on a per service basis.
16. The non-transitory computer-readable medium of claim 14, wherein the retry time adjusts to computing device overloads and recoveries.
17. The non-transitory computer-readable medium of claim 14, wherein corresponding requests from the first subset of the end-user devices and the corresponding requests from the second subset of the end-user devices are for the same service.
18. The non-transitory computer-readable medium of claim 14, wherein corresponding requests from a third subset of the end-user devices are for a service that is different from a service that the first subset of the end-user devices is requesting, wherein the method further includes processing the corresponding requests from the third subset of the end-user devices prior to processing corresponding requests from the first subset of the end-user devices.
19. The non-transitory computer-readable medium of claim 14, wherein the method includes turning a traffic spike into a constant load.
20. A computing device comprising:
a system load during a traffic spike;
a network interface for communicatively coupling with at least one end-user device to receive a request; and
a non-transitory computer-readable medium storing instructions to implement:
a counter that counts a number of errors that have occurred within a time period; and
a server controlled adaptive back off module that adjusts a retry time based on an error rate over the time period, wherein the retry time is relayed to the at least one end-user device such that the system load is spread over time.
21. The computing device of claim 20, wherein the network interface receives the request resent from the at least one end-user after the retry time has passed.
22. The computing device of claim 20, wherein the retry time calculated at a first point in time is longer than the retry time calculated at a second point in time subsequent the first point in time.
23. The computing device of claim 20, wherein the retry time calculated at a first point in time is shorter than the retry time calculated a second point in time subsequent the first point in time.
24. The computing device of claim 20, wherein the error rate is observed across all services hosted by the computing device.
25. The computing device of claim 20, wherein the error rate is observed on a per service basis.
26. The computing device of claim 20, wherein the retry time is based on a priority access associated with a user of the at least one end-user device.
27. The computing device of claim 20, wherein the server controlled adaptive back off module influences how end-user devices that is communicatively coupled with the computing device behave, wherein each influence is different.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A positive photosensitive composition showing a difference in solubility in an alkali developer as between an exposed portion and a non-exposed portion, which comprises, as components inducing the difference in solubility,
(a) a photo-thermal conversion material, and
(b) a high molecular compound, of which the solubility in an alkali developer is changeable mainly by a change other than a chemical change.
2. The positive photosensitive composition according to claim 1, wherein the photo-thermal conversion material (a) is a light-absorbing dye having an absorption band covering a part or whole of a wavelength region of from 650 to 1300 nm.
3. The positive photosensitive composition according to claim 1, wherein the photo-thermal conversion material (a) is at least one compound selected from a cyanine dye, a polymethine dye, a squarilium dye, a croconium dye, a pyrylium dye and a thiopyrylium dye.
4. The positive photosensitive composition according to claim 1, wherein the high molecular compound (b) is a novolak resin andor a polyvinyl phenol resin.
5. The positive photosensitive composition according to claim 1, wherein the high molecular compound (b) is a novolak resin.
6. The positive photosensitive composition according to claim 1, which does not contain, in the positive photosensitive composition, a compound susceptible to a photochemical sensitizing effect by the photo-thermal conversion material.
7. The positive photosensitive composition according to claim 1, which contains, as a further component of the positive photosensitive composition, a solubility-suppressing agent (c) capable of lowering the dissolution rate, in the alkali developer, of a blend comprising an infrared absorbing dye of component (a) and a high molecular compound of component (b).
8. The positive photosensitive composition according to claim 7, wherein the solubility-suppressing agent (c) is a compound not susceptible to a photochemical sensitizing effect by the photo-thermal conversion material.
9. The positive photosensitive composition according to claim 7, wherein the solubility-suppressing agent (c) is a compound capable of lowering the dissolution rate, in the alkali developer, of the blend comprising an infrared absorbing dye of component (a) and a high molecular compound of component (b) to a level of at most 50%.
10. The positive photosensitive composition according to claim 7, wherein the solubility-suppressing agent (c) is at least one member selected from sulfonic acid esters, phosphoric acid esters, aromatic carboxylic acid esters, carboxylic anhydrides, aromatic ketones, aromatic aldehydes, aromatic amines and aromatic ethers.
11. The positive photosensitive composition according to claim 7, wherein the solubility-suppressing agent (c) is a compound having substantially no photosensitivity to ultraviolet light.
12. The positive photosensitive composition according to claim 7, wherein the solubility-suppressing agent (c) is an o-quinone diazide compound.
13. The positive photosensitive composition according to claim 7, wherein the solubility-suppressing agent (c) is an o-quinone diazide compound of a novolak resin.
14. The positive photosensitive composition according to claim 1, which contains substantially no photo-acid-generator, as a component of the positive photosensitive composition.
15. A positive photosensitive composition comprising a photo-thermal conversion material and an alkali-soluble resin and having a characteristic represented by B<A where A is the solubility, in an alkali developer, at an exposed portion of the composition, and B is the alkali solubility after heating of the exposed portion.
16. A positive photosensitive lithographic printing plate having a positive photosensitive composition according to claim 1, formed on a support.
17. The positive photosensitive lithographic printing plate having a positive photosensitive composition according to claim 15, formed on a support.
18. A method for making a positive photosensitive lithographic printing plate, which comprises a step of scanning and exposing a positive photosensitive lithographic printing plate according to claim 16 by means of a light ray belonging to a wavelength region of from 650 to 1300 nm and having a light intensity sufficient to let the high molecular compound form an image.
19. A method for making a positive photosensitive lithographic printing plate, which comprises a step of scanning and exposing a positive photosensitive lithographic printing plate according to claim 16 by means of a light ray belonging to a wavelength region of from 650 to 1300 nm and having a light intensity of at least 2106 mJscm2.
20. The method for making a positive photosensitive lithographic printing plate according to claim 18, wherein the light source for the light ray is a semiconductor laser or a YAG laser.
21. A method for making a positive photosensitive lithographic printing plate, which comprises a step of scanning and exposing a positive photosensitive lithographic printing plate according to claim 17 by means of a light ray belonging to a wavelength region of from 650 to 1300 nm and having a light intensity sufficient to let the high molecular compound form an image.
22. A method for making a positive photosensitive lithographic printing plate, which comprises a step of scanning and exposing a positive photosensitive lithographic printing plate according to claim 17 by means of a light ray belonging to a wavelength region of from 650 to 1300 nm and having a light intensity of at least 2106 mJscm2.
23. The method for making a positive photosensitive lithographic printing plate according to claim 21, wherein the light source for the light ray is a semiconductor laser or a YAG laser.