1. A processor-based method for providing access to a plurality of event log files, comprising:
writing information to respective current logical portions of the plurality of event log files by an open distributed transaction processing system in response to processing of transactions;
initiating a first service in response to a service call by a client;
instructing the open distributed transaction processing system, via the first service, to cycle a selected one of the plurality of event log files identified by a file name provided by a client to the first service;
preventing cycling of an event log file requested by file name by the first service in response to a first state of a first configuration parameter that is associated with all of the plurality of event log files, wherein the preventing includes preventing the cycling in response to a second state of the first configuration parameter and a first state of a second configuration parameter associated with the event log file with the input file name; and
cycling the selected one of the plurality of event log files in response to the second state of the first configuration parameter and a second state of the second configuration parameter, wherein cycling includes stopping writing of information to the current logical portion of the file and commencing writing of information to a new logical portion of the file by the open distributed transaction processing system in cycling the event log file, whereby the new logical portion becomes the current logical portion.
2. The method of claim 1, further comprising;
initiating a second service in response to a service call by a client; and
instructing the open distributed transaction processing system, via the second service to obtain and return a file name of the event log file.
3. The method of claim 1, further comprising:
initiating a second service in response to a service call by a client; and
returning the contents of the event log file to the client via the second service.
4. The method of claim 1, further comprising:
initiating a second service in response to a service call by a client;
instructing the open distributed transaction processing system, via the second service to obtain and return a file name of the event log file; and
denying the second service access to the file name of the event log file in response to the first state of the first configuration parameter associated with the event log file.
5. An apparatus for providing access to a plurality of event log files, comprising:
means for writing information to respective current logical portions of the plurality of event log files by an open distributed transaction processing system in response to processing of transactions;
means for initiating a first service in response to a service call by a client;
means for instructing the open distributed transaction processing system, via the first service, to cycle a selected one of the plurality of event log files identified by a file name provided by a client to the first service;
means for preventing cycling of an event log file requested by file name by the first service in response to a first state of a first configuration parameter that is associated with all of the plurality of event log files, wherein the preventing includes preventing the cycling in response to a second state of the first configuration parameter and a first state of a second configuration parameter associated with the event log file with the input file name; and
means for cycling the selected one of the plurality of event log files in response to the second state of the first configuration parameter and a second state of the second configuration parameter, wherein cycling includes stopping writing of information to the current logical portion of the file and commencing writing of information to a new logical portion of the file by the open distributed transaction processing system in cycling the event log file, whereby the new logical portion becomes the current logical portion.
6. The apparatus of claim 5, further comprising;
means for initiating a second service in response to a service call by a client; and
means for instructing the open distributed transaction processing system, via the second service to obtain and return a file name of the event log file.
7. The apparatus of claim 5, further comprising:
means for initiating a second service in response to a service call by a client; and
means for returning the contents of the event log file to the client via the second service.
8. A client-server computing arrangement for providing access to a plurality of event log files, comprising:
an open distributed transaction processing system configured to write information to respective current logical portions of the plurality of event log files in response to processing of transactions, the system including a set of program-callable routines that provide access to the event log file;
a set of library routines configured to call the system routines;
a set of client-callable services, wherein one or more of the services call one or more of the library routines, and at least one of the services is coupled to the event log file, the set of services including a first service configured to instruct the open distributed transaction processing system via one or more routines in the library to cycle a selected on of the plurality of event log files identified by a file name provided by a client to the first service, wherein cycling includes stopping writing of information to the current logical portion of the file and commencing writing of information to a new logical portion of the file, whereby the new logical portion becomes the current logical portion; and
wherein the distributed transaction processing system is configured to prevent cycling of an event log file requested by file name by the first service in response to a first state of a first configuration parameter that is associated with all of the plurality of event log files, wherein the preventing includes preventing the cycling in response to a second state of the first configuration parameter and a first state of a second configuration parameter associated with the event log file with the input file name, and the distributed transaction processing system further configured to cycle the selected one of the plurality of event log files in response to the second state of the first configuration parameter and a second state of the second configuration parameter.
9. The arrangement of claim 8, wherein the set of services includes a second service that instructs the open distributed transaction processing system via one or more routines in the library to obtain and return a file name of the event log file.
10. The arrangement of claim 8, wherein the set of services includes a second service that returns the contents of the event log file to a calling client.
11. The arrangement of claim 8, wherein the set of services includes a second service that instructs the open distributed transaction processing system via one or more routines in the library to obtain and return a file name of the event log file, and the open distributed transaction processing system is configured to deny the second service access to the file name of the event log file in response to the first state of the first configuration parameter associated with the event log file.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A process for preparing olefin homopolymers or copolymers which comprises polymerizing by polymerization of at least one olefin in a hydrocarbon or a mixture of hydrocarbons in the presence of a molar mass regulator, a mixed catalyst and a substance which increases the electrical conductivity of the hydrocarbon or the mixture of hydrocarbons and is soluble in the hydrocarbon or the mixture of hydrocarbons or which reacts with components of the mixed catalyst, wherein the mixed catalyst is obtainable by reaction of a magnesium alkoxide with titanium(IV) halide, and comprises titanium in the oxidation states four and three and also an organoaluminum compound, where the molar ratio of Ti(IV) to Ti(III) is from 100:1 to 1:100 and wherein up to a ratio component of 0.15, soluble organoaluminum compounds which increase the electrical conductivity of the solution are formed.
2. The process as claimed in claim 1, wherein the molar ratio of Ti(IV) to Ti(III) is from 10:1 to 2:1.
3. The process as claimed in claim 1, wherein the olefin to be polymerized is propylene or ethylene or a mixture of propylene and ethylene.
4. The process as claimed in claim 3, wherein the olefin is ethylene.
5. The process as claimed in claim 4, wherein the polymerization is carried out at temperatures of from 30 to 130\xb0 C. and partial pressures of the monomer to be polymerized of from 0.05 to 0.6 mPa.
6. The process as claimed in claim 1, wherein the substance which increases the electrical conductivity of the hydrocarbon or the mixture of hydrocarbons is selected from the group consisting of oxygen, protic compounds which are soluble in the hydrocarbon or the mixture of hydrocarbons and polyionic compounds which are soluble in the hydrocarbon or the mixture of hydrocarbons.
7. The process as claimed in claim 6, wherein the substance which increases the electrical conductivity of the hydrocarbon or the mixture of hydrocarbons is a mixture comprising at least one polysulfone and at least one polymeric polyamine.
8. The process as claimed in claim 6, wherein the substance which increases the electrical conductivity of the hydrocarbon or the mixture of hydrocarbons is water or an alcohol, where the molar ratio of wateraluminum or alcoholaluminum does not exceed 0.15.
9. The process as claimed in claim 1, wherein the mixed catalyst is a supported catalyst.
10. The process as claimed in claim 1, wherein the mixed catalyst is obtainable obtained by reaction of magnesium alkoxide with titanium tetrahalide in a molar ratio of from 1:0.5 to 1:4 in an aliphatic hydrocarbon and subsequent preactivation by means of an organoaluminum compound, with partial conversion of the Ti(IV) component into the Ti(III) component occurring and the molar ratio of Ti(IV) to Ti(III) being from 10:1 to 1:1.
11. The process as claimed in claim 10, wherein the preactivation is carried out using trimethylaluminum, triethylaluminum or tripropylaluminum with partial conversion of the Ti(IV) component into the Ti(III) component and the molar ratio of Ti(IV) to Ti(III) being from 2.0:1 to 3.0:1.
12. The process as claimed in claim 9, wherein the catalyst obtained is used for the polymerization of ethylene and the concentration of the organoaluminum compound is from 10\u22125 to 10\u22124 mol of All.
13. The process as claimed in claim 1, wherein said titanium(IV) halide is TiCl4.
14. The process as claimed in claim 10, wherein the preactivation is carried out using trimethylaluminum, triethylaluminum or tripropylaluminum with partial conversion of the Ti(IV) component into the Ti(III) component and the molar ratio of Ti(IV) to Ti(III) being from 2.6:1.
15. The process as claimed in claim 9, wherein the catalyst obtained is used for the polymerization of ethylene and the concentration of the organoaluminum compound is 2\xd710\u22125 to 10\u22124 mol of All.